Vulnerabilities

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Usermode Exploits (Game Savedata)[edit | edit source]

PS1 games savedata exploits[edit | edit source]

See PS1 Emulation for a list of candidate games.

See PS1 Dev Wiki for a list of PS1 savedata exploits.

PS2 games savedata exploits[edit | edit source]

See PS2 Emulation for a list of candidate games.

See PS2 Dev Wiki for a list of PS2 savedata exploits.

PSP games savedata exploits[edit | edit source]

See PSP Emulation for a list of candidate games.

See PSP Dev Wiki for a list of PSP savedata exploits.

PS4/PS5 PS2emu sandbox escape (mast1c0re)[edit | edit source]

Advantages of the PS4/PS5 PS2emu sandbox escape exploit over most WebKit exploits:

  • Bigger kernel attack surface (more usermode privileges) versus WebKit very restricted and becoming more and more with firmware revisions. For example, the PS2emu process uses libkernel_sys, which supports nmount and so mounting of system partitions, whilst neither libkernel_web nor regular libkernel do.
  • 100% reliable versus WebKit exploits becoming less and less stable with firmware revisions
  • Firmware agnostic (ROP-less code execution) versus almost one WebKit revision every three firmware update

Credits[edit | edit source]

  • CTurt for discovering these vulnerabilities in September 2021.
  • CTurt for public disclosure on twitter (2022-09-14).
  • flatz, balika011, theflow0, chicken(s), PlayStation for helping CTurt.
  • McCaulay for sharing publicly his implementation in February 2023.

Analysis[edit | edit source]

Bug Description[edit | edit source]

After getting code execution in a PS2onPS4 game using a savedata exploit, it is possible to exploit the PS2 emulator to get x86-64 usermode ROP execution. It is then possible, without a kernel exploit, to load another PS2 game in the emulator with a compatibility rate based on the PS2 emulator configuration.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

No as of PS4 FW 11.50 and PS5 FW 8.00. Using the PS2onPS4 game Okage Shadow King, the exploit should work starting from PS4 FW 3.15 and PS5 FW 1.00.

PS4/PS5 game savedata Lua exploit[edit | edit source]

Credits[edit | edit source]

Bug description[edit | edit source]

Some PS4 (and maybe PS5) games, in disc version (usually also available in PS Store version, some even in free demo version, but potentially patched), can be exploited as they allow the user to execute Lua code by crafting an evil save data. By running malicious Lua code, the attacker can escape the Lua sandbox and obtain usermode arbitrary read-write then ROP chain execution in usermode.

On PS Vita, you can simply install the DRM demos, the same way as you would for Bitter Smile Demo (see h-encore by TheFloW).

If you have access to the PS4/PS5 PS Store, you can simply buy the trial version to test it.

Artemis and MUGEN engines are known to use Lua and so are vulnerable to various sandbox escape exploits.

Most of Artemis games automatically load save9999.dat file from save data folder when the game boots. By editing this file, one can load custom LUA scripts.

Game boots -> "save9999.dat" is loaded -> "inject.iet" is loaded -> "inject.lua" is loaded.

You might have to create a different save9999.dat file for each game as the Lua interpreter version might differ.

On Windows, you have access to luasocket and os.execute. However, on PS Vita/PS4/PS5, you have limited access.

You have to copy PS Vita/PS4/PS5 savedata files to the console.

The PSP Emulator for PS4 (and for PS5, and probably the PS1 and PS2 Emulators too) uses Lua 5.3 to read Lua scripts. However, these scripts are usually not in savedata but in game data so there is not such an easy entrypoint as the Artemis games one.

Vulnerable games[edit | edit source]

See Artemis Engine for a list of candidate games.

Confirmed exploitable games (Lua 5.1 usually, to confirm):

  • Raspberry Cube (CUSA16074)
  • Aibeya (CUSA17068)
  • Hamidashi Creative (CUSA27389)
  • Hamidashi Creative Demo (CUSA27390)

Other games that may use Lua scripts:

Analysis[edit | edit source]

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

No as of PS4 FW ?12.00? and PS5 FW 7.61.

Usermode Exploits (BD-J)[edit | edit source]

Advantages of most BD-J exploits over most WebKit exploits:

  • Bigger kernel attack surface (more usermode privileges) versus WebKit very restricted and becoming more and more with firmware revisions. For example, the BD-J process uses libkernel_sys, which supports nmount and so mount of system partitions, whilst neither libkernel_web nor regular libkernel do.
  • 100% reliable versus WebKit exploits becoming less and less stable with firmware revisions
  • Firmware agnostic (ROP-less code execution) versus almost one WebKit revision every three firmware update
  • JIT enabled allowing to write a kernel exploit in C versus writing in assembly and JavaScript since around FW 2.00

FW <= 10.71 - BD-JB2 - Path traversal sandbox escape by TheFloW[edit | edit source]

Credits[edit | edit source]

  • TheFloW for the exploits finding (before 2023-09-11), ethical disclose to SCE (2023-09-22) and public disclosure (2023-10-25)
  • Previous BD-JB contributors

Analysis[edit | edit source]

Bug Description[edit | edit source]

Basing on the BD-JB1 exploit files, in /bdmv/bdjo.xml changing bdjo/applicationManagementTable/baseDirectory to a path of the form `file:///app0/cdc/lib/../../../disc/BDMV/JAR/00000.jar` allows loading a JAR Java executable file. This vulnerability can efficiently replace the UserPreferenceManagerImpl to extend the supported System Software versions range compared to BD-JB1.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

No as of PS4 FW 10.71 (maybe patched on PS4 FW 11.00). Yes on PS5 FW 8.00. Probably not patched on PS3.

FW <= 9.00 - BD-JB - Five vulnerabilities chained by TheFloW[edit | edit source]

Credits[edit | edit source]

  • CTurt for FreeDVDBoot exploit on PS2 and the idea to hack BD-J on PS3 and PS4 on twitter (2020-06-27)
  • TheFloW for finding these vulnerabilities (around 2021-10-24) and disclosing them publicly on hackerone and hardwear.io (2022-06-10)
  • Sleirsgoevy for writing the first public implementation (2022-06-16)
  • psxdev, sleirsgoevy and John Törnblom for the public implementations

Analysis[edit | edit source]

Bug Description[edit | edit source]

This exploit chain alone does not allow one to run pirated games on PS4 or PS5 as there is not enough RAM allowed in the BD-J process and there are other constraints.

TODO!: ADD DESCRIPTION OF EACH ONE OF THE 5 BUGS:

#1 - userprefs hijack (?PS3?, PS4, PS5)[edit | edit source]

com.sony.gemstack.org.dvb.user.UserPreferenceManagerImpl userprefs hijack leads to classes instantiation under privileged context.

#2 - com.oracle.security.Service (?PS3?, PS4, not PS5)[edit | edit source]

com.oracle.security.Service leads to privileged constructor call.

#3 - com.sony.gemstack.org.dvb.io.ixc.IxcProxy leading to privileged method call (?PS3?, PS4, PS5)[edit | edit source]

com.sony.gemstack.org.dvb.io.ixc.IxcProxy leads to privileged method call.

#4 - JIT compiler hack (?PS3?, PS4, not PS5)[edit | edit source]

JIT compiler hack leads to usermode arbitrary RW and usermode arbitrary code execution.

#5 - UDF buffer overflow (?PS3?, PS4, PS5)[edit | edit source]

The UDF driver in kernel contains a buffer overflow. Note that no implementation of the UDF kernel exploit has ever been done even by TheFloW, only a kernel panic PoC.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

No as of PS4 FW 9.00 and PS5 FW 4.03. At least partially patched on PS4 FW 9.50 and PS5 FW 5.00.

On PS4 FW 9.03 and PS5 FW ?4.50?, the bug #5 (UDF) has been patched.

Usermode Exploits (WebKit)[edit | edit source]

WebKit sources[edit | edit source]

WebKit sources

WebKit sources archived currently up to version 11.00. Useful for people that cannot access PlayStation URLs and also for when Sony will inevitably stop hosting the sources.

FW ?6.00-11.52? - get_by_id_with_this associated with ProxyObject can leak JSScope objects[edit | edit source]

Credits[edit | edit source]

  • Alexey Shvayka for discovery (2021-05-05) and incremental fixes (from 2021-05-20 to 2024-07-31)
  • Filip Pizlo for reviewing and not pushing it (2021-06-10)
  • Ahmad Saleem for reminding WebKit that it is still not fixed (2022-09-03)
  • Yusuke Suzuki and Justin Michaud for fix commits review.

Analysis[edit | edit source]

Bug Description[edit | edit source]

  • TODO: document the general vulnerability coming from |this|.

According to the spec [1], `var base = { foo }; with (base) foo();` should be called with `this` value of `base`, which is why FunctionCallResolveNode moves resolved scope to thisRegister(). That is arguably a bad design, and there is an effort [2] to abolish using JSScope as `this` value.

When `this` value is accessed by JS code, it's being sanitized via ToThis (JSScope replaced with `undefined`), yet not in case of `super.property` access calling into ProxyObject `get` trap, which passes raw `this` value as receiver parameter, leaking JSScope to be exploited.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Maybe

Tested[edit | edit source]

Not tested yet on PS4 or PS5.

FW ?6.00-11.52? - Integer underflow in JSC genericTypedArrayViewProtoFuncCopyWithin (CVE-2023-38600)[edit | edit source]

Credits[edit | edit source]

  • anonymous researcher for discovering the vulnerability and reporting it to Zero Day Initiative (2023-05)
  • Yusuke Suzuki and Mark Lam for fixing the bug in WebKit (2023-07-31)
  • Hossein Lotfi for publishing a writeup (2023-10-18)

Analysis[edit | edit source]

Bug Description[edit | edit source]

It is required to recompute length properly when resize happens during TypedArray copyWithin.

copyWithin's side effectful operation can resize resizable ArrayBuffer. WebKit has a code catching this and recompute the appropriate copy count again, but it can overflow if `to` or `from` are larger than the newly updated `length`. The patch handles this case correctly: returning since there is no copying content in this case.

The issue was patched by aborting the copy if either of the two variables to or from is larger than the updated length.

The values used during the exploit were sane as they went through a sanitizer function. However, in the final stage, the values were updated without checking if there are inside the buffer length bounds.

According to PS4 WebKit source code for System Software version 11.00, not only it is not patched but it uses code from 2021! Looking at a version close to one in the PS4 source code for System Software version 11.00, it should be exploitable.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Maybe in FW 11.50.

Tested[edit | edit source]

Not tested yet on PS4 nor PS5. To test on PS4 11.00.

FW ?6.00-11.00? - CloneDeserializer::deserialize() UaF (CVE-2023-28205) leading to arbitrary RW[edit | edit source]

Credits[edit | edit source]

  • Clément Lecigne of Google's Threat Analysis Group and Donncha Ó Cearbhaill of Amnesty International’s Security Lab for discovering the vulnerability and reporting it to Apple (2023-04-10)
  • Justin Michaud, Mark Lam and JonWBedard for fixing the bug in WebKit (2023-04-17)
  • abc (anonymous) for making an OOM PoC for PS4 and PS5 (2024-12-01)

Analysis[edit | edit source]

Bug Description[edit | edit source]

Previously, CloneDeserializer::deserialize() was storing pointers to newly created objects in a few Vectors, in a MarkedArgumentBufferBase. This is problematic because the GC is not aware of Vectors, and cannot scan them. Instead, CloneDeserializer::deserialize() should store cell pointers in a MarkedVector.

The PoC code triggers a use-after-free (UaF) vulnerability by delaying the addition of Map and Date objects, which allows the garbage collector (GC) to free them. This can potentially lead to accessing freed objects to corrupt memory. Then it cannot avoid executing a release assert that causes an Out-Of-Memory crash.

The WebKit patch refactors the MarkedArgumentBuffer class into a MarkedVector template class.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes on PS4 FW ?11.00? and PS5 FW ?8.00?.

Tested[edit | edit source]

Tested working on PS4 FWs ? and PS5 FWs 6.00-7.61.

FW 6.00-9.60 - FrameLoader::loadInSameDocument() UaF (CVE-2022-22620) leading to arbitrary RW[edit | edit source]

Credits[edit | edit source]

  • Sergei Glazunov, Google Project Zero, for reporting the bug in 2013-01 and answering Maddie Stone's questions in 2022 (2013)
  • Maddie Stone, Google Project Zero, for sharing a write-up describing this vulnerability (2022-06-14)
  • abc (anonymous) for making an OOM PoC for webkit-gtk, PS4 and PS5 (2023-10-03) then making an arbitrary RW PoC (PSFree) for webkit-gtk, PS4 6.00-9.60 and PS5 1.00-5.50 (2023-10-24)
  • CelesteBlue for testing and porting abc' PSFree to PS4 6.00-9.60 and PS5 1.00-5.50 (2023-11-04)

Analysis[edit | edit source]

Bug Description[edit | edit source]

The History API allows access to (and modification of) a stack of the pages visited in the current frame, and these page states are stored as a SerializedScriptValue. The History API exposes a getter for state, and a method replaceState() which allows overwriting the "most recent" history entry.

The bug is that FrameLoader::loadInSameDocument() takes the state as an argument (stateObject), but does not increase its reference count. Only a HistoryItem object holds a reference to the stateObject. loadInSameDocument() can trigger a callback into user JavaScript through the onblur event. The user's callback can call replaceState() to replace the HistoryItem's state with a new object, therefore dropping the only reference to the stateObject. When the callback returns, loadInSameDocument() will still use this free'd object in its call to statePopped(), leading to the use-after-free.

When loadInSameDocument() is called it changes the focus to the element its scrolling to. If we set the focus on a different element prior to loadInSameDocument()'s execution, the blur event will be fired on that element. Then we can free the stateObject by calling replaceState() in the onblur event handler.

The bug is triggered by history.back() with the target state whose URL contains a hash. Here's a Proof-of-Concept that will crash: 

input = document.body.appendChild(document.createElement('input'));

foo = document.body.appendChild(document.createElement('a'));
foo.id = 'foo';

function pop(event) {
    alert('you get a crash after you close this alert');
    event.state; // use the freed SerializedScriptValue
    alert('WebKit version not vulnerable');
}

addEventListener('popstate', pop);

history.pushState('state1', '', location + '#foo'); // URL with a hash
history.pushState('state2', '');

setTimeout(() => {
    input.focus();
    input.onblur = () => {
        history.replaceState('state3', '')
    };
    setTimeout(() => {
        history.back(); // trigger loadInSameDocument()
    }, 1000);
}, 1000);

The user may then trigger a double free and escalate it into an arbitrary read primitive via spraying WTF::StringImpls like in the buildBubbleTree() UaF exploit. The read primitive is used to create the addrof() primitive and is used to save addresses of buffers that will be used to modify a SerializedScriptValue. After freeing the StringImpl (triple free), SerializedScriptValues are sprayed via the postMessage() JavaScript function until one is allocated using the previously freed memory.

The method used to modify the fields of the StringImpl for arbitrary reads can be used can also be used to modify the SerializedScriptValue. Appropriate fields can modified to have deserialization create a JSC::JSArrayBufferView whose m_vector field will point to another JSArrayBufferView, which will be called the worker. The user can modify the worker's fields for arbitrary read/write. Deserialization is done via msg.data where msg is the MessageEvent from postMessage().

A way to know if the system is vulnerable is the appearance of the input HTML element in the PoC page. If the HTML input field stays focused (blue outline) after the second timeout, then the vulnerability is not present. Note that Maddie Stone's PoC will never trigger any sort of crash on release builds as it was meant for builds with memory sanitation that can detect UaFs.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes on PS4 FW 10.00 and PS5 FW 6.00.

The patch changes the stateObject argument to loadInSameDocument from a raw pointer, SerializedScriptValue*, to a reference-counted pointer, RefPtr<SerializedScriptValue>, so that loadInSameDocument now increments the reference count on the object.

Tested[edit | edit source]

Tested working on PS4 FWs 6.00-9.60 and PS5 FWs 1.00-5.50. PS4 FWs <= 5.56 are invulnerable as the HTML input field stays focused (blue outline) after second timeout whilst it should not if the console were exploitable.

FW 9.00-9.04 - WebCore::CSSFontFaceSet vulnerabilities leading to arbitrary RW[edit | edit source]

There are many FontFaceSet vulnerabilities. Explore [1].

Credits[edit | edit source]

  • Myles C. Maxfield (litherum), Apple, for adding the vulnerability in WebKit (2016-02-22) then fixing and so disclosing the vulnerability (2021-08-26)
  • Maddie Stone, Google Project Zero, for sharing a write-up describing this vulnerability (2021-10-13)
  • PS Test discord server community for testing PoCs of many WebKit vulnerabilities on their PS4s (2021-10-13)
  • sleirsgoevy for making the first exploit PoC for Safari (2021-10-24) and the first exploit PoC for PS4 FW 9.00-9.04 and PS5 FW 3.00-4.50 (2021-10-27)

Analysis[edit | edit source]

Bug Description[edit | edit source]

Description in WebKit fix commit by Myles C. Maxfield:

After r256659, asking for a failed CSSFontFace's families() returns nullopt. It is possible to add a failed font to a CSSFontFaceSet (of course). When we do that, we recognize the font is failed and do not update our internal data structures, because there's no need to - we cannot do anything useful with a failed font. If you _then_ try to remove the font from the CSSFontFace, we do not call families(), but instead just pull out the raw m_families member, and look in our internal data structures for it, but we do not find it, because it was never added.

Description in Maddie Stone's write-up:

The vulnerability is a use-after-free due to an unchecked end() iterator. There was an assert statement: ASSERT(iterator != m_facesLookupTable.end());, but ASSERTs do not do anything in release builds. Therefore, even if iterator == m_facesLookupTable.end() in the release build, nothing would happen and iterator would still be used. In FontFaceSet a FontFace is not added to the faces lookup table in addToFacesLookupTable if the font has already been deemed to be invalid. However, removeFromFacesLookupTable would still attempt to remove the font, leading to the use-after-free. The patch changes the ASSERT to an if clause. The function will return if iterator == m_facesLookupTable.end(), since the item it wishes to remove is not found in the table.

Description by sleirsgoevy:

On PS4 FWs 9.00-9.04 the constructor returns with an exception, but to C++ code that ignores it. That is how an invalid font is created in the first place. On earlier PS4 FWs the exception is propagated to JavaScript.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes on PS4 FW 9.50 and No as of PS5 FW 4.51 (need to test on PS5 FWs >=5.00). Not working on PS4 FWs <9.00 and PS5 FWs <2.10.

Might have been introduced in PS4 FW 3.50 and before PS5 FW 1.00 according to dates (need to check). However the vulnerability cannot be exploited in some conditions depending on how WebKit was compiled. For example, on PS4 FWs 7.55-8.52 and PS5 FWs <= 2.00, the FontFaceSet constructor returns with an exception that is propagated to JavaScript, preventing exploitation this way.

Tested[edit | edit source]

Tested working on PS4 FWs 9.00-9.04 and PS5 FWs 3.00-4.51. Untested: PS5 FWs 2.10-2.70 and >=5.00.

FW 6.00-7.55 - WebCore::ValidationMessage::buildBubbleTree() UaF leading to arbitrary RW[edit | edit source]

Credits[edit | edit source]

  • Quentin Meffre (@0xdagger) and Mehdi Talbi (@abu_y0ussef) who are Security Researcher at Synacktiv for fuzzing WebKit, finding a way to exploit the vulnerability on PS4, presenting it on Black Hat Europe 2020 ([2]) and sharing the code (2020-12-10)
  • sleirsgoevy for porting (although with low success rate) to PS4 FWs 7.00-7.02

Analysis[edit | edit source]

Bug Description[edit | edit source]

  • The method buildBubbleTree makes a call to update the layout during which all user registered JS handlers are executed. If the ValidationMessage is destroyed in a JS callback, this could lead to a Use-After-Free situation when we get back to buildBubbleTree code.
  • ValidationMessage::buildBubbleTree is doing layout which can run a script detaching the owner form element, and this ValidationMessage object can be destroyed.

After private disclose by Synacktiv ethical hackers, the vulnerability was fixed in WebKit on September 11st 2020. SIE updated to the patched WebKit with firmware 8.00 released on October 14st 2020.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 8.00 FW.

Tested[edit | edit source]

Tested working on FWs 6.00-7.55, not working on FWs <= 5.56. HTML textarea guessed addresses for FWs 6.70-7.55 are known but not for FWs 6.00-6.51 so an attacker needs to make tests to determine these addresses on FWs 6.00-6.51.

FW 6.00-6.72 - bad_hoist Type Confusion exploit (CVE-2018-4386) leading to arbirary RW[edit | edit source]

Credits[edit | edit source]

  • Lokihardt (from Google Project Zer0) for the exploit PoC (Sep 13, 2018)
  • Fire30 for turning the vulnerability into exploit for PS4 (Dec 30, 2019)
  • sleirsgoevy for attempting to stabilize the PS4 exploit with a new implementation (Feb 23, 2020)

Analysis[edit | edit source]

Bug Description[edit | edit source]

WebKit: JSC: BytecodeGenerator::hoistSloppyModeFunctionIfNecessary does not invalidate the ForInContext object.

It is possible to craft Javascript in such a way that allows for an object to be passed as the property variable directly as a string to the op_get_direct_pname handler without being properly validated.

This is a Type Confusion exploit.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 7.00 FW

FW 4.50-6.72 - DOMWindow::open heap UaF (CVE-2021-30849) leading to crash[edit | edit source]

Credits[edit | edit source]

  • Sergei Glazunov (from Google Project Zer0) for the exploit PoC (Jul 1, 2021)

Analysis[edit | edit source]

Bug Description[edit | edit source]

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 7.00 FW.

Tested[edit | edit source]

Vulnerable on PS4 FWs 4.50-6.72. Not vulnerable on FWs <= 4.07. Not vulnerable on FWs >=7.00 according to manual tests but need to check WebKit sources.

FW 4.50-6.20 - JSArray::shiftCountWithArrayStorage() OOB RW (CVE-2018-4441) leading to arbitrary RW[edit | edit source]

Credits[edit | edit source]

  • Lokihardt (from Google Project Zer0) for the exploit PoC (Oct 3, 2018)
  • Specter for the rewriting for PS4 (Mar 8, 2019)
  • St4rk for helping Specter

Analysis[edit | edit source]

Bug Description[edit | edit source]

We would take the fast path for JSArray::shiftCountWithArrayStorage when the array hasHoles(). However, the code for this was wrong. It would incorrectly update ArrayStorage::m_numValuesInVector.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 6.50 FW.

Tested[edit | edit source]

It does not work on <= 4.07 FW PS4 according to tests as the exploit fails at step "Triggering memory corruption".

FW 6.00-6.20 - JSC::arrayProtoPrivateFuncConcatMemcpy() Information Leak (CVE-2018-4358) ?leading to ASLR defeat?[edit | edit source]

Credits[edit | edit source]

  • bkth, niklasb and saelo (from phoenhex Team) for the exploit PoC in Safari (Sep 26, 2018)
  • Vultra for discovering that the exploit worked on PS4 FW 6.00 (Dec 10, 2018)

Analysis[edit | edit source]

Bug Description[edit | edit source]

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 6.50 FW

Tested[edit | edit source]

Works on 6.00-6.20. Not working on PS4 FWs <= 5.56 because JSC (JavaScriptCore) was too old.

FW 4.50-5.56 - JSGlobalObject::haveABadTime() Type Confusion (CVE-2017-7005) leading to arbitrary RW[edit | edit source]

Credits[edit | edit source]

  • Lokihardt (from Google Project Zer0) for the exploit PoC (Mar 20, 2017)
  • ALEXZZZ9 for the first PS4 implementation (on 5.01), and at same time for burning the exploit (Feb 20, 2018)
  • qwertyoruiop for rewriting and porting to 5.05 and 5.50

Analysis[edit | edit source]

Project Zer0 Bug Description

Bug Description[edit | edit source]

When JSGlobalObject::haveABadTime() is called with arrays of a different JSGlobalObject type, type confusion can occur, leading to memory corruption.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 6.00 FW

FW ?.??-4.05-5.56 - Document::adoptNode() UaF (CVE-2017-2468) leading to crash[edit | edit source]

Credits[edit | edit source]

  • Lokihardt (from Google Project Zer0) for the exploit PoC (Jan 23, 2017)
  • CelesteBlue for testing on PS4 and PS Vita (May 9, 2020)

Analysis[edit | edit source]

Bug Description[edit | edit source]

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 6.00 FW. Vulnerable at least on PS4 FWs 4.05-5.56 and PS Vita FW 3.60.

FW 4.50-5.56 - WebCore::HTMLFrameElementBase::marginHeight() Heap UaF (CVE-2016-1859) leading to arbitrary RW[edit | edit source]

Credits[edit | edit source]

  • Liang Chen, wushi of KeenLab, Tencent working with Trend Micro's Zero Day Initiative for discovering this vulnerability (2016-03-16)

Analysis[edit | edit source]

Bug Description[edit | edit source]

The specific flaw exists within the handling of GraphicsContext objects. By manipulating a document's elements an attacker can force this object in memory to be reused after it has been freed. An attacker can leverage this vulnerability to execute code under the context of the current process.

CVE-2016-1859 is a use-after-free vulnerability that existed in the Safari web browser. A GraphicsContext object is used in the setPlatformTextDrawingMode function after it has been freed. The successful triggering of the use-after-free vulnerability itself does not allow the attacker to directly change the control flow or disclose arbitrary memory contents. However, the use-after-free yields an arbitrary-memory-write primitive by hijacking a destination pointer that will be used for the memcpy function. Once the arbitrary-memory-write primitive is achieved, the attacker sprays the heap with string objects to achieve the arbitrary-memory-read primitive. Relying on the pointer width heap alignment, the attacker can accurately predict the exact address of one of the string objects among the heap spray and pinpoint the address of member variable. At this point, the attacker can overwrite the length member variable of a string object and partially disclose the out-of-bound heap area exceeding the buffer address of the string. The partial disclosure of the heap memory allows the attacker to extend the information leak step-by-step and ultimately allows full chaining of ROP, which leads to arbitrary code execution.

Exploit Implementation[edit | edit source]

  • PoC publicly available
  • No full exploit publicly available but exploitation description is detailed

Patched[edit | edit source]

Yes in 6.00 FW. Vulnerable on PS4 FWs 4.50-5.56.

FW 4.50-5.01 - Element::setAttributeNodeNS() UaF leading to arbitrary RW[edit | edit source]

Credits[edit | edit source]

  • Lokihardt (from Google Project Zer0) for the exploit PoC (Mar 15, 2017)
  • qwertyoruiop for the PS4 exploit (October 2017)
  • Specter for the writeup (May 27, 2018)

Analysis[edit | edit source]

Bug Description[edit | edit source]

By forcing setAttributeInternal() to call setAttributeNodeNS() twice, an attribute node reference will be added twice to the list. When one is free()'d, the second attribute still contains a duplicate stale reference, leading to a use-after-free (UAF) scenario.

Exploit Implementation[edit | edit source]

PS4 5.05 WebKit + Kernel Exploit

Patched[edit | edit source]

Yes in 5.03 FW.

FW 3.15-4.07 - Stack Uninitialized Read UaF leading to arbitrary RW[edit | edit source]

Credits[edit | edit source]

  • qwertyoruiop for the exploit
  • Specter for the writeup

Analysis[edit | edit source]

Bug Description[edit | edit source]

Via a specially crafted valueOf() function of an arguments.length() function, non-zero indexes of the stack-allocated array are not initialized, leading to a stack uninitialized read. This can be abused to store a reference that can later be re-obtained post-GC (garbage collection) yielding a use-after-free() (UAF) situation.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 4.50 FW

Tested[edit | edit source]

Works on 3.15-4.07. Not working on <= 3.11.

FW <= ?4.05? - Type confusion in WebCore::HTMLInputElement::onSearch (CVE-2017-2354)[edit | edit source]

Credits[edit | edit source]

  • Neymar of Tencent's Xuanwu Lab working with Trend Micro's Zero Day Initiative for discovering this vulnerability (2016-11)
  • Brent Fulgham for fixing the bug in WebKit (2016-11-14)
  • Jasiel Spelman (@WanderingGlitch) for his writeup (2017-12-20)

Analysis[edit | edit source]

Bug Description[edit | edit source]

It is possible for JavaScript to change the type property of an input field. WebKit needs to gracefully handle this case.

This bug could have been prevented had it a debug check been used instead of a runtime check. In fact, WebKit has support for this type of assertion already through a RELEASE_ASSERT macro, which would have turned this exploitable bug into a simple denial-of-service by immediately and safely crashing the browser.

The fix commit of the vulnerability adds a type traits specialization so that WebKit can properly downcast InputType elements. This should be used only to call search functions on actual search input types.

Although the access violation in WebCore::TimerBase::heapPop is where we see the result of the bug, it is not the cause of the issue. The crash actually occurs as a result of reading a pointer that comes from the 'this' object. Based on that, it would seem that something is wrong with the Timer object passed into the WebCore::TimerBase::heapPop function.

This vulnerability may be the one used by Chaintin Tech with a kernel exploit on PS4 FW 4.01 at GeekPwn 2016, a Tencent Security's conference, in Shanghai Station at the Pavilion Safety Research Lab, (https://www.chaitin.cn/ps4, https://www.psxhax.com/threads/ps4-4-01-linux-installation-ksploit-demo-at-geekpwn-2016.932/)

Exploit Implementation[edit | edit source]

  • PoC by Neymar (2016-11, disclosed publicly by Jasiel Spelman on 2017-12-20):
<input id="m_input" type="search"></input>
<script type="text/javascript">
	first = true;
	m_input.addEventListener("input", function (e) {
		if(first) {
			first = false;
		}
		else {
			m_input["type"] = "image";
		}
	}, false);
</script>

Patched[edit | edit source]

Maybe in 4.06 FW

Tested[edit | edit source]

Not yet.

FW 3.15-3.70 - JSArray::sortCompactedVector() Heap UaF leading to arbitrary RW[edit | edit source]

Credits[edit | edit source]

  • xyz for the original exploit on PSVita (HENkaku)
  • Fire30 for porting to PS4
  • Specter for improved PS4 playground

Analysis[edit | edit source]

Bug Description[edit | edit source]

When attempting to update a vector via sortCompactedVector() - data is written based on a pointer, though the pointer is not re-updated nor nulled. When this memory in free()'d, the reference is maintained and thus memory corruption can occur.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 4.0?0? FW

Tested[edit | edit source]

Works on 3.15-3.70. Not working on <= 3.11. Maybe working on 4.00.

FW <= 3.50 - WebCore::TimerBase::heapPopMin() Heap UaF leading to crash[edit | edit source]

Credits[edit | edit source]

  • Brent Fulgham for fixing the bug in WebKit (2016-05-16)

Analysis[edit | edit source]

Bug Description[edit | edit source]

"As of firmware version 3.55 a patch has been included to prevent a use-after-free segmentation fault from being exploited. This could have led to a ROP chain and code execution. It would have been cool if someone would have done some real research on it..." qwertyoruiop

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 3.55 FW

Tested[edit | edit source]

Works on 3.15, 3.50 FW. Maybe working on 3.51 FW.

FW <= ?2.50? - JavaScript OnLoad Handler Remote Code Execution Vulnerability (CVE-2005-1790) leading to crash or lag[edit | edit source]

Credits[edit | edit source]

  • Benjamin Tobias Franz for the vulnerability discovery (2005-11-21)
  • Stuart Pearson for the Proof of Concept on Microsoft Internet Explorer
  • Sam Sharps for the Metasploit port (2012-01)
  • Jeerum for disclosing that the vulnerability affects PS4 <=2.50 (2014-10-31).

Analysis[edit | edit source]

Bug Description[edit | edit source]

This bug is triggered when the browser handles a JavaScript 'onLoad' handler in conjunction with an improperly initialized 'window()' JavaScript function. This exploit results in a call to an address lower than the heap. The javascript prompt() places our shellcode near where the call operand points to. We call prompt() multiple times in separate iframes to place our return address. We hide the prompts in a popup window behind the main window. We spray the heap a second time with our shellcode and point the return address to the heap. I use a fairly high address to make this exploit more reliable. Microsoft Internet Explorer will crash when the exploit completes. Also, please note that Microsoft Internet Explorer must allow popups in order to continue exploitation.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Maybe

Tested[edit | edit source]

  • Working on 1.76-2.50 FW: crash. 3.00-5.50 error CE-36329-3. 4.55 lag in background TV application (for example Netflix application).

FW <= 2.03 - WebCore::CSSSelector Heap Overflow (CVE-2014-1303) leading to arbitrary RW[edit | edit source]

Credits[edit | edit source]

  • KeenTeam for finding and documenting the bug
  • Liang Chen from KeenTeam for the writeups
  • xyz for porting to PSVita FWs 3.30-3.36
  • Fire30 for porting to PS4
  • dreadlyei (unknown person, credited by Fire30)

Analysis[edit | edit source]

Bug Description[edit | edit source]

By forcing addRule() to be called on a CSS Selector via window.getMatchedCSSRules(), a 1-bit OOB write can be achieved and leveraged to corrupt heap memory.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 2.50 FW

Tested[edit | edit source]

  • Working on 2.00-2.03 FW. Might work on 2.04 (99% sure as 2.04 PUP is about same size as 2.03 PUP).
  • Working on AppleWebKit/537.73
  • Maybe not working on FW < 2.00.

FW <= 2.03-? - WebCore::ImageInputType::attach Heap UaF (CVE-2013-2857) leading to ROP execution[edit | edit source]

Credits[edit | edit source]

  • Chromium bugs reporters
  • JumpCallPop, jam1garner, hedgeberg for inital exploit on Wii U
  • yellows8 for ROP on Wii U
  • orboditilt for increasing stability on Wii U
  • zoogie for porting Wii U exploit to New3DS
  • CelesteBlue for testing on PS4 FW 2.03

Analysis[edit | edit source]

Bug Description[edit | edit source]

Use-after-free with input type image. Error event was fired synchronously blowing away the input element from underneath.

Exploiting this vulnerability on PS4 is not good because:

  • This vulnerability does not provide arbitrary RW without code execution, hence ROP chain (at least to stack pivot to JiT code) must be made with a memory dump or decrypted modules for this FW gotten using another vulnerability.
  • There is usermode ASLR since about FW 1.70 so ROP chain gadgets must be relocated at runtime. This means another vulnerability allowing usermode arbitrary read is needed.
  • As usually an arbitrary read vulnerability also gives arbitrary write, and as arbitrary RW leads to usermode code execution (by hijacking JS pointers in virtual table), this UaF is not needed at all.
  • Even if we get ROP chain to work on PS4 with this UaF vulnerability, there is no evidence that a return to JavaScript from ROP chain is doable, making this exploit less convenient than arbitrary RW exploits method of getting code execution then returning to usermode by restoring vtable.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in ? FW

Tested[edit | edit source]

  • Working on 2.03 FW. Might work on 2.04 (99% sure as 2.04 PUP is about same size as 2.03 PUP).

FW <= 1.76 - JSArray::sort() Heap Overflow (CVE-2012-3748, PSA 2013-0903-1) leading to arbitrary RW[edit | edit source]

Credits[edit | edit source]

  • Vitaliy Toropov for the exploit on Mac OS X Safari (September 4, 2013)
  • nas and Proxima for the first PS4 POC on 1.76 PS4 (October 23, 2014)
  • sony for patching the exploit in FW 2.00 (October 27, 2014)
  • CTurt for the rewriting (PS4 1.76 PlayGround) and implementation with his 1.76 kexploit (December 6, 2015) [5]

Analysis[edit | edit source]

Bug Description[edit | edit source]

By forcing the compare function to reduce the size of the array, trailing items will be written out of bounds (OOB write), leading to heap memory corruption.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 2.00 FW

Tested[edit | edit source]

  • Working on PS4 1.00-1.76 FW, AppleWebKit/531.3-536.26
  • Might work on PS4 FW 0.930.020.

Possible WebKit vulnerabilities[edit | edit source]

CVE-2017-7064
https://project-zero.issues.chromium.org/issues/42450258

CVE-2018-4192
https://blog.ret2.io/2018/06/13/pwn2own-2018-vulnerability-discovery/
https://blog.ret2.io/2018/06/19/pwn2own-2018-root-cause-analysis/#arrayreverse-considered-harmful
https://blog.ret2.io/2018/07/11/pwn2own-2018-jsc-exploit/

CVE-2018-4443
WebKit JSC - 'AbstractValue::set' Use-After-Free
lokihardt of Google Project Zero
2019-01-22
https://www.exploit-db.com/exploits/46071

Improper Restriction of Operations within the Bounds of a Memory Buffer

Unknown CVE
Luca Todesco (qwertyruiopz)
before 2019-08-15
https://gist.github.com/jakeajames/5ceb90ebaa34eabb3e170b5c7eb2c7d1/revisions

Resources for WebKit exploitation[edit | edit source]

https://webkit.org/blog/12967/understanding-gc-in-jsc-from-scratch/

https://googleprojectzero.blogspot.com/2019/08/jsc-exploits.html

Usermode securities[edit | edit source]

Usermode ASLR[edit | edit source]

  • Very old firmwares (<= 1.05) do not have ASLR enabled, but it was introduced sometime before firmware 1.70. "Address Space Layout Randomization" (ASLR) is a security technique which causes the base addresses of modules to be different every time you start the PS4.
  • To defeat usermode ASLR on FWs >=1.70, we can use the module imports table to find other modules address once we know SceWebkit2 address.

Module imports table cleaned before execution[edit | edit source]

  • Between 1.76 and 4.05, Sony did that to prevent WebKit exploiters from defeating usermode ASLR easily.
  • Now we have to dump entire usermode sandboxed memory, and by studying it we can defeat ASLR:

1. Chose a function (ex: __stack_chk_fail) imported from libkernel.sprx by libSceWebkit2.sprx

2. Read pointer contained at the address where the call is done

3. Substract to this pointer the offset of the function (ex: __stack_chk_fail) in LibKernel module

4. This result is LibKernel base address. This method works for any imported module.

For FW >= 6.00, for web applications, libkernel.sprx has been replaced by libkernel_web.sprx and libSceWebKit2 by libSceNKWebKit.sprx. libkernel.sprx is still used by other applications.

DEP / NX[edit | edit source]

  • "Data Execution Prevention" / "No eXecute" is enabled on all firmwares. It prevents allocating memory as both RW and RX at same time (RWX) so preventing us from writing shellcode to usermode memory then executing it.
  • 2 ways to bypass this security: JiT vulnerability (FW <= 1.76) or ROP (all FWs).

JiT removed from webbrowser[edit | edit source]

  • On FW <= 1.76, you could map RWX memory from ROP by abusing the JiT functionality and the sys_jitshm_create and sys_jitshm_alias system calls. This however was fixed after 1.76, as WebKit has been split into two processes. One handles javascript compilation and the other handles other web page elements like image rendering and DOM. The second process will request JiT memory upon hitting JavaScript via IPC (Inter-Process Communication). Since we no longer have access to the process responsible for JiT, we can no longer (at least currently), map RWX memory for proper code execution unless the kernel is patched.
  • Checking the source code at ps4-oss, starting as early as FW 6.00, ENABLE_JIT=OFF for -DPORT=PlayStation4. It means that JIT functionality is completely removed from WebKit and there is no JIT coprocess that is allowed to request RWX memory to even attack. Even if there are JIT bugs that can lead us to request RWX memory in other platforms, we can't on the PS4 as there is no longer any JIT process. Unchecked all source codes, JIT process could have been removed earlier than 6.00. All exploits must use ROP.
  • Workaround is to use ROP.

Syscalls removed[edit | edit source]

Direct Syscall invocation disabled in PS4 Kernel[edit | edit source]

Between 2.00 and 2.57, SCE has disabled direct system calls by usermode, by adding some checks in the PS4 kernel. An attacker can no longer call any syscall he wants by specifying the call number in the rax register and jump directly to the call instructions part of a syscall stub. Indeed, now the PS4 (but not PS5) implementation of amd64_syscall checks the following:

  • The address in the Instruction Pointer (IP) of the call must be within the memory range of the associated libkernel module of the process,
  • The code pointed by the Instruction Pointer (IP) must follow the syscall stub format,
  • The syscall number passed in argument to amd64_syscall must corresponds to the stub's syscall number. amd64_syscall checks the stub's mov rax, syscall_number instruction.

Since PS4 version 3.00, issuing directly a syscall instruction crashes the application and gives error CE-34878-0, (SCE_KERNEL_ABORT_REASON_SYSTEM_ILLEGAL_FUNCTION_CALL), displaying the message "Kernel: The application directly issues a syscall instruction (24)".

An attacker is now forced to use wrappers provided from the libkernel / libkernel_web / libkernel_sys modules to trigger system calls.

The PS5 does not enforce the passed syscall number and thus any code can directly issue an arbitrary syscall even if the associated libkernel does not provide it.

bpf_write function stripped out of the kernel[edit | edit source]

  • On 4.70, bpfwrite() was stripped out of the kernel entirely to patch kernel vulnerability exploited in 4.55 kexploit.

bpf_open function blocked for unprivileged processes[edit | edit source]

  • On 5.50, opening BPF has been blocked for unprivileged processes such as WebKit and other apps/games. It's still present in the sandbox, however attempting to open it will fail and yield EPERM. This aims blocking BPF kernel exploits especially qwertyoruiop's BPF double free UAF.

bpf_ioctl function blocked or removed[edit | edit source]

  • On FW 5.50+, opening BPF is still possible in less sandboxed apps like TestKit/DevKits fSELFs. But this is useless because ioctl does not work.

Device access blocked/removed from webbrowser[edit | edit source]

  • Around 6.50-6.70, device access got blocked or removed. Now you can no longer access devices from the web browser.

Pointer poisoning in WebKit on 6.xx firmwares[edit | edit source]

  • For select types implemented by WebKit (such as JSC::JSFunction), certain pointer fields are XOR'ed by a cryptographic key generated at runtime. The key is generated once every process launch, one must recover it to unpoison the pointers.

Flush-to-Zero and Denormals-are-Zero Floating-Point environment[edit | edit source]

Subnormal numbers (also called as denormal numbers in IEEE 754 documents before the 2008 version) are treated as 0 on the PlayStation runtime environment. This isn't technically a security technique but it does inhibit any exploit that uses floating-point numbers for read/write.

An example entrypoint is WebKit where exploits have commonly used double arrays with incorrect length to read/write certain memory areas to gain arbitrary read/write or even code execution. With FTZ/DAZ, the possible 64-bit values one can write have become even more limited. Reads using double arrays are also affected. Even if the bit pattern is nonzero but encodes a subnormal, it will be read by the JavaScript engine as 0.

Kernel[edit | edit source]

FW <= 11.52 - Double free in bnet_netevent_set_queue[edit | edit source]

Credits[edit | edit source]

  • Anonymous for sharing 11.52 and 12.00 PS4 kernel dumps.
  • 2024-09-27 D-Link Turtle for diffing 11.52 and 12.00 PS4 kernel dumps.
  • 2024-10-04 SlidyBat for figuring out the bug in bnet and its impact.

Analysis[edit | edit source]

Bug Description[edit | edit source]

A double free can happen by racing calls to bnet_netevent_set_queue and bnet_netevent_unset_queue.

The lack of mutexes allowed double free as fdrop is called unconditionally in bnet_netevent_unset_queue.

See also PS Vita SceNetPs kernel module that uses similar bnet functions.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 12.00 FW. Maybe not working at all on PS5.

The bug was patched in PS4 FW 12.00 by adding some mutexes in bnet_netevent functions

FW <= 11.00 - Remote vulnerabilities in spp (yielding kernel ASLR defeat) (CVE-2006-4304 and no-CVE)[edit | edit source]

Credits[edit | edit source]

  • 2006-08-23 Martin Husemann, Pavel Cahyna for discovering the first spp bug (CVE-2006-4304) on FreeBSD 4.11-6.1.
  • 2023-09-22 TheFloW for discovering that PS4 and PS5 are vulnerable to CVE-2006-4304, discovering second spp bug, and chaining them together.
  • 2024-01-27 anonymous for reporting publicly CVE-2006-4304 as working on PS4 and PS5. See [6] and [7].
  • 2024-03 iMrDJAi for porting CVE-2006-4304 to PS4 and PS5.
  • 2024-04-25 TheFloW for disclosing his HackerOne report including the second spp bug description.
  • 2024-04-30 TheFloW for releasing his exploit code for PS4 9.00 and 11.00.

Analysis[edit | edit source]

Bug Description[edit | edit source]

A malicious PPPoE server can cause denial-of-service or remote code execution in kernel context on the PS4/PS5. It does not require any usermode code execution to be triggered. There are two vulnerabilities that can be chained together to cause remote kernel Denial of Service, kernel ASLR defeat or kernel code execution : Heap buffer overwrite and overread in sppp_lcp_RCR and sppp_ipcp_RCR (CVE-2006-4304) and Integer underflow in sppp_pap_input leading to heap-buffer overread (no-CVE).

The PS4/PS5 must be connected using an ethernet cable to a device able to trigger PPPoE requests and analyze the responses.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 11.02 FW

FW <= 9.00 - PPPoE driver remote buffer overflow (CVE-2022-29867)[edit | edit source]

Credits[edit | edit source]

  • 2021-09-24 m00nbsd for finding the vulnerability
  • 2022-05-04 martin of NetBSD for fixing the vulnerability publicly in NetBSD 8 and 9
  • 2022-05-11 m00nbsd for disclosing the vulnerability publicly on HackerOne

Analysis[edit | edit source]

Bug Description[edit | edit source]

The PlayStation 4 has a kernel PPPoE driver, that originates from NetBSD. This driver has a kernel heap overflow vulnerability, that an attacker can remotely trigger over the LAN, with the ability to control both the contents that are overflown and their sizes.

Extract of NetBSD 8.3 changelog: 

sys/net/if_pppoe.c			1.179

	pppoe(4): fix CVE-2022-29867 - discovery phase local network
	mbuf corruption.
	[martin, ticket #1740]

Do not allocate mbuf clusters when the caller (eroneously) asks
for more than MCLBYTES size, instead fail the allocation.

When we have received multiple PADO offer packets in the discovery
phase, do not combine tags from different packets. We are supposed
to pick one PADO packet and continue session establishment with that.

The second bug could cause code to trigger the first and create
invalid response packets and also overwrite data outside of
the allocated mbuf cluster.

Fixes CVE-2022-29867.

Diff after fix commit in NetBSD 8: 

--- src/sys/net/if_pppoe.c	2020/02/13 19:37:39	1.125.6.10
+++ src/sys/net/if_pppoe.c	2022/05/04 15:36:35	1.125.6.11
@@ -1,4 +1,4 @@
-/* $NetBSD: if_pppoe.c,v 1.125.6.10 2020/02/13 19:37:39 martin Exp $ */
+/* $NetBSD: if_pppoe.c,v 1.125.6.11 2022/05/04 15:36:35 sborrill Exp $ */
 
 /*-
  * Copyright (c) 2002, 2008 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_pppoe.c,v 1.125.6.10 2020/02/13 19:37:39 martin Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_pppoe.c,v 1.125.6.11 2022/05/04 15:36:35 sborrill Exp $");
 
 #ifdef _KERNEL_OPT
 #include "pppoe.h"
@@ -871,6 +871,10 @@ breakbreak:;
 			}
 			sc->sc_ac_cookie_len = ac_cookie_len;
 			memcpy(sc->sc_ac_cookie, ac_cookie, ac_cookie_len);
+		} else if (sc->sc_ac_cookie) {
+			free(sc->sc_ac_cookie, M_DEVBUF);
+			sc->sc_ac_cookie = NULL;
+			sc->sc_ac_cookie_len = 0;
 		}
 		if (relay_sid) {
 			if (sc->sc_relay_sid)
@@ -886,6 +890,10 @@ breakbreak:;
 			}
 			sc->sc_relay_sid_len = relay_sid_len;
 			memcpy(sc->sc_relay_sid, relay_sid, relay_sid_len);
+		} else if (sc->sc_relay_sid) {
+			free(sc->sc_relay_sid, M_DEVBUF);
+			sc->sc_relay_sid = NULL;
+			sc->sc_relay_sid_len = 0;
 		}
 		memcpy(&sc->sc_dest, eh->ether_shost, sizeof sc->sc_dest);
 		callout_stop(&sc->sc_timeout);
@@ -1313,6 +1321,9 @@ pppoe_get_mbuf(size_t len)
 {
 	struct mbuf *m;
 
+	if (len + sizeof(struct ether_header) > MCLBYTES)
+		return NULL;
+
 	MGETHDR(m, M_DONTWAIT, MT_DATA);
 	if (m == NULL)
 		return NULL;

Exploit Implementation[edit | edit source]

  • PoC (poc.c) by m00nbsd not disclosed publicly

Patched[edit | edit source]

Yes in 9.03 FW according to Specter by diffing PS4 9.00 and 9.03 kernels

FW <= 9.00 - exFAT driver heap-based buffer overflow[edit | edit source]

Credits[edit | edit source]

  • 2021-09-15 TheFloW for finding the vulnerability
  • 2021-12-02 zecoxao for advicing to exploit the vulnerability after diffing PS4 9.00 and 9.03 kernels
  • 2021-12-13 ChendoChap, Znullptr, Specter for PS4 9.00 kernel exploit implementation release

Analysis[edit | edit source]

Bug Description[edit | edit source]

The PS4 kernel exFAT driver has a heap-based buffer overflow vulnerability that can be triggered by inserting a malicious USB storage device in PS4 in addition to having usermode code execution. Exploitation requires to flash a crafted exFAT image to a common USB storage device.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in PS4 9.03 FW and PS5 4.50 FW

FW <= 7.55 - IP6_EXTHDR_CHECK Double Free (CVE-2020-9892)[edit | edit source]

Credits[edit | edit source]

  • 2019-09-15 tuexen for finding the FreeBSD vulnerability [8]
  • 2020-07-24 TheFloW for finding CVE-2020-9892 in XNU
  • 2020-07-26 TheFloW for porting CVE-2020-9892 to PS4
  • 2020-07-27 TheFloW for publishing publicly a PoC leading to code execution on XNU. [9]
  • 2021-01-12 TheFloW for disclosing publicly the PS4 vulnerability. [10]
  • 2021-01-20 sleirsgoevy for making a first working exploit for FreeBSD 9 [11]
  • 2021-03-03 sleirsgoevy for making a second working exploit for FreeBSD 9 [12]
  • 2021-03-12 sleirsgoevy for making the first public usable exploit for PS4 7.50-7.55 (https://twitter.com/sleirsgoevy/status/1370481212813348865)

Analysis[edit | edit source]

Bug Description[edit | edit source]

Memory corruption can be achieved by sending fragmented IPv6 packets to loopback interface due to poor and inconsistent use of IP6_EXTHDR_CHECK.

The macro IP6_EXTHDR_CHECK can free the mbuf if the packet is sent to loopback interface. This fact is not considered in dest6_input(), frag6_input() and more. For example in dest6_input(), the double pointer is not updated.

Hence, when parsing next headers, the mbuf can be free'd once again, leading to a double free which behaves like a use-after-free when we allocate mbuf's again.

Normally, this path would not be triggerable, because sending to loopback interface requires SOCK_RAW root privileges. However, for some reason on the PS4 SOCK_RAW sockets can be opened in Webkit process! Moreover, CelesteBlue confirmed that SOCK_RAW sockets can also be opened in PS4 Kit fSELF.

According to TheFloW, the reliability of the FreeBSD 9 PoC is very high, around 80%, whereas the PS4 PoC's is not very high, he guesses around 20%.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 8.00 FW

FW <= 7.02 - IPV6_2292PKTOPTIONS UaF (yielding arbitrary kernel R/W) (CVE-2020-7457)[edit | edit source]

Credits[edit | edit source]

  • 2018-08-18 up to 2020-07-06 Fire30 for finding and keeping the vulnerability as a private 0day for it not to be patched by SIE. [13]
  • 2020-07-06 TheFloW for publishing publicly a PoC leading to code execution on FreeBSD. [14]
  • sleirsgoevy and ChendoChap for porting the PoC to PS4 and chaining it with the 6.72 and 7.02 WebKit exploits.
  • SIE for not patching this vulnerability on PS5 even when patched on PS4.
  • TheFlow for announcing that PS5 kernel was exploited: TheFloW's PS5 kernel exploit announcement (2021-11-07) and later that it was that same vulnerability that was present in PS5 FW 3.00-4.51.

Analysis[edit | edit source]

Bug Description[edit | edit source]

Due to missing locks in option IPV6_2292PKTOPTIONS of setsockopt, it is possible to race and free the struct ip6_pktopts buffer, while it is being handled by ip6_setpktopt. This structure contains pointers (ip6po_pktinfo) that can be hijacked to obtain arbitrary kernel R/W primitives. As a consequence, it is easy to have kernel code execution. This vulnerability is reachable from WebKit sandbox and is available in the latest FW, that is 7.02.

Another description: There is a race and use-after-free vulnerability in the FreeBSD kernel IPv6 socket handling. A missing synchronization lock in the `IPV6_2292PKTOPTIONS` option handling in `setsockopt` permits racing `ip6_setpktopt` access to a freed `ip6_pktopts` struct. This exploit overwrites the `ip6po_pktinfo` pointer of a `ip6_pktopts` struct in freed memory to achieve arbitrary kernel read/write.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in PS4 7.50 FW and in PS5 5.00 or 5.02 FW. Not working in PS5 FWs <= 2.70.

FW <= 5.07 - BPF Race Condition (Yielding Double Free())[edit | edit source]

Analysis[edit | edit source]

Specter's Writeup of the 5.05 BPF Race Condition

Bug Description[edit | edit source]

Due to improper locking, two threads can enter the BPF SETWF ioctl command handler. While the bug is similar to that of 4.55, the method of attack is slightly different. Since write() was removed for BPF in 4.70, instead of triggering a use-after-free with write() - SETWF is ran in parallel via threading. Eventually, both calls will copy the same pointer to the stack, leading to both threads free()'ing the same pointer, poisoning the freelist. This can later be leveraged via heap spraying to corrupt heap memory to obtain arbitrary code execution in supervisor mode (ring0).

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 5.50 FW

FW <= 4.55 - BPF Race Condition (Yielding UaF)[edit | edit source]

Analysis[edit | edit source]

Specter's Writeup of the 4.55 BPF Race Condition

Bug Description[edit | edit source]

Due to improper locking, two threads can enter the BPF ioctl command handlers for setting a new write filter (SETWF) and setting a filter (SETIF). Both threads will reference the same pointer. In specially crafted situations, one thread could free() this pointer while the other thread executes it as a filter post-validation. This allows an unprivileged user to obtain an out-of-bounds (OOB) write on the stack, leading to arbitrary code execution in supervisor mode (ring0).

Exploit Implementation[edit | edit source]

PS4 4.55 WebKit + Kernel Exploit
PS4 4.55 WebKit + Kernel Exploit Source

Patched[edit | edit source]

Yes in 4.70 FW

FW <= 6.00 ?6.02? - sys_getcontext Information Leak (kASLR defeat) (CVE-2018-17155)[edit | edit source]

Analysis[edit | edit source]

Bug Description[edit | edit source]

System call 421 or sys_getcontext() initializes the structure pointed at by ucp to the currently active context. The vulnerability is, some areas of memory copied out are not initialized, and thus the function leaks memory at certain spots. This vector was patched in 6.20, as now before the buffer is used it is initialized to 0 via bzero().

Exploit Implementation[edit | edit source]

  • QuickHEN by CelesteBlue (v2 not released yet)
  • KitHEN by CelesteBlue (not released yet)

Patched[edit | edit source]

Yes somewhere between 6.00 and 6.20 FW

FW <= 4.07 - sys_thr_get_ucontext Information Leak (kASLR defeat)[edit | edit source]

Analysis[edit | edit source]

Specter's Writeup

Bug Description[edit | edit source]

System call 634 or sys_thr_get_ucontext() allows to obtain information on a given thread. The vulnerability is, some areas of memory copied out are not initialized, and thus the function leaks memory at certain spots. This vector was patched in 4.50, as now before the buffer is used it is initialized to 0 via bzero().

Exploit Implementation[edit | edit source]

PS4 4.05 WebKit + Kernel Exploit

Patched[edit | edit source]

Yes in 4.50 FW

FW <= 4.05 - NamedObj Type Confusion (Yielding UaF)[edit | edit source]

Credits[edit | edit source]

  • Chaitlin Tech for having been the first to show they had pwned PS4 FW 4.01 at Geekpwn convention. (2016-10-24)

official video, tweet 1, tweet 2, tweet 3 (2016-10-25)

  • fail0verflow for the first writeup (2017-10-19)
  • Specter for rewriting the exploit using a different object, and releasing it publicly (2017-12-27)

Analysis[edit | edit source]

Bug Description[edit | edit source]

Type confusion in the namedobj system once exploited can lead to an arbitrary free() allowing an attacker to craft a use-after-free() (UAF) situation to corrupt kernel memory. This can be leveraged to eventually obtain an arbitrary code execution primitive in supervisor mode (ring0).

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 4.06 FW

Tested[edit | edit source]

Works on FWs 4.00-4.05. On <= 3.70 FW we have not found a way to leak the target object, but it might be doable as Fail0verflow did it on 1.01.

<= 3.15 - .symtab kernel table of symbols kept on low FWs[edit | edit source]

Credits[edit | edit source]

  • CelesteBlue for backporting kernel exploits to dump PS4 3.50 kernel (2019-05-09) and 3.15 (2019-05-25)
  • zecoxao and SocraticBliss for analysing kernel dumps

Bug description[edit | edit source]

After Sony removed .strtab since FW 1.03 and .dynstr/.dynsym since FW 2.50 from PS4 kernel binary, they still kept the .symtab one.

Patched[edit | edit source]

Yes in 3.50 FW.

<= 2.50 - .dynstr/.dynsym kernel table of symbols kept on low FWs[edit | edit source]

Bug description[edit | edit source]

After Sony removed .strtab from PS4 kernel binary since FW 1.03, they still kept the .dynstr/.dynsym one.

Patched[edit | edit source]

Yes in 2.50 FW.

FW <= 1.76 - dlclose Kernel Heap Overflow[edit | edit source]

Credits[edit | edit source]

  • Discovered by CTurt.
  • Privately implemented thanks to qwertyoruiop.
  • CTurt published a writeup.
  • The exploit was publicly implemented by kR105 and on another side by Zer0xFF and Bigboss (psxdev).

Analysis[edit | edit source]

Analysis of sys_dynlib_prepare_dlclose PS4 kernel heap overflow (by CTurt with the help of qwertyoruiop)

Bug Description[edit | edit source]

Integer overflow in the sys_dynlib_prepare_dlclose() system call can lead to a heap overflow causing memory corruption, allowing an attacker to obtain code execution in supervisor mode (ring0).

Exploit Implementation[edit | edit source]

Public release by kR105

Patched[edit | edit source]

Yes in 2.00 FW

FW <= 1.76 - BadIRET (CVE-2014-9322, CVE-2015-5675)[edit | edit source]

Credits[edit | edit source]

  • Andy Lutomirski for CVE-2014-9322 (2014-11-22)
  • Konstantin Belousov, Andrew Lutomirski for CVE-2015-5675 (2015-07-08)
  • Adam Zabrocki (pi3) for asking CTurt to test CVE-2015-5675 on PS4 (2015-08-21) [15], [16]
  • Volodymyr Pikhur for exploiting FreeBSD and PS4 in private (2015-09-24) [17]
  • CTurt for porting the exploit from FreeBSD 9 to PS4 (2015-12-06) [18]

Analysis[edit | edit source]

Bug Description[edit | edit source]

Faults associated with the stack segment (SS) register are not handled properly, allowing unprivileged users to trigger an IRET instruction that accesses a GS Base from usermode memory, providing an attacker with a method of privilege escalation.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Yes in 2.00 FW

FW ??? - setlogin Information Leak (CVE-2014-8476)[edit | edit source]

Warning: this has not been tested on PS4.

Credits[edit | edit source]

  • Mateusz Guzik for finding the vulnerability
  • Volodymyr Pikhur for advising to use this vulnerability at his Playstation 4 Rest Mode DEMO in REcon Brussels 2018
  • Francisco Falcon for making a PoC on FreeBSD 8.4

Analysis[edit | edit source]

Bug Description[edit | edit source]

The setlogin function in FreeBSD 8.4 through 10.1-RC4 does not initialize the buffer used to store the login name, which allows local users to obtain sensitive information from kernel memory via a call to getlogin, which returns the entire buffer.

When setlogin(2) is called while setting up a new login session, the login name is copied into an uninitialized stack buffer, which is then copied into a buffer of the same size in the session structure. The getlogin(2) system call returns the entire buffer rather than just the portion occupied by the login name associated with the session.

An unprivileged user can access this memory by calling getlogin(2) and reading beyond the terminating NUL character of the resulting string. Up to 16 (FreeBSD 8) or 32 (FreeBSD 9 and 10) bytes of kernel memory may be leaked in this manner for each invocation of setlogin(2).

This memory may contain sensitive information, such as portions of the file cache or terminal buffers, which an attacker might leverage to obtain elevated privileges.

Exploit Implementation[edit | edit source]

Patched[edit | edit source]

Maybe.

<= 1.01 - .strtab/.symtab kernel table of symbols kept on very low FWs[edit | edit source]

Bug description[edit | edit source]

  • Sony used to have two tables of symbols on very low versions: .strtab/.symtab and .dynstr/.dynsym (.strtab/.symtab had all symbols, .dynstr/.dynsym had ~75% of them).

Patched[edit | edit source]

Yes in 1.03 FW. Seen in 1.01 PS4 kernel.

Kernel securities[edit | edit source]

Kernel ASLR[edit | edit source]

Since 3.50 FW, ASLR (Address Space Layout Randomization) has been enabled in PS4 kernel. This means that to properly exploit the kernel to escalate privileges, an information disclosure vulnerability will most likely be needed to defeat ASLR and locate the kernel in memory.

Kernel SMAP[edit | edit source]

PS4 APU does not support SMEP ("Supervisor Mode Execution Prevention") so there is no way it supports SMAP ("Supervisor Mode Access Prevention"). However, in PS4 5.0x FW and above, a sort of SMAP was added to the kernel to prevent exploiters from pivoting the kernel stack pointer (RSP) to usermode memory: attempting to do so would crash the system. Sony probably added checks into the scheduler to check the stack pointer (RSP) against usermode addresses when running in kernel context. A new exploitation strategy is needed to run kernel ROP chains because an exploiters now needs to get his kernel ROP chain inside kernel memory to be executed.

SMAP bypass method: JOP[edit | edit source]

To bypass PS4 SMAP, qwertyoruiop decided in his 5.05 PS4 kernel exploit to go with the method he used on the Apple iPhone 7 - essentially using JOP to push a bunch of stack frames onto the kernel stack, and memcpy()'ing the kernel ROP chain into RSP. qwertyoruiop explained: "JOP seems to work, but exploit is not reliable enough to repeat it multiple times implementing logic in-between (like on the FW 4.55 kernel bug where every primitive would re-exploit the bug). Using pure JOP logic would be long because of the need to find good instructions gadgets, and would vary a lot from a FW version to another. The strategy chosen is thread-safe and calling-convention aware, but most importantly pivot-less. We use JOP to implement a simple loop based on deref&branch logic. Every iteration runs a function prolog followed by a branch. This pushes lots of stack frames on stack, padding RSP. When loop is done, prepare call to memcpy with RDI = RSP, RSI = controlled pointer, RDX = (size of pushed stack frame * number of iterations - 1). We overwrite all fake frames but one with ROP. Memcpy will return into our first gadget, kickstarting the chain. At tail end of chain we just return into matching function epilog to resume clean execution by popping the one untouched frame. RSP never pivoted so PS4 successfully runs the kernel ROP chain."

SMAP bypass method: cli/sti[edit | edit source]

A PS4 SMAP bypass has been showed by sleirsgoevy in his 6.72 PS4 kernel exploit implementation. It consists in wrapping the main kernel ROP with cli/sti pair, which would prevent it from being preempted. This way the thread's CPU core will not run other kernel code during kernel ROP execution, and other cores have no way of detecting the stack pivot, so the mitigation is defeated.

PS5 SMAP bypass method: CVE-2021-29628[edit | edit source]

A SMAP bypass has been found by m00nbsd while working on FreeBSD 12. It is named CVE-2021-29628 and affects FreeBSD 12.2 and later (til it was patched). It does not work on PS4 because PS4 kernel is based on FreeBSD 9 which did not contain the vulnerability and because PS4 SMAP does not come from FreeBSD but is custom from Sony. It used to work on PS5 before it was disclosed and patched. See CVE-2021-29628 on PS5 Dev Wiki.

CR0.WP protection[edit | edit source]

At least since PS4 System Software version 6.51, Sony instrumented all instructions that write to the CR0 register with checks for attempts to clear CR0.WP (Write Protect), which is necessary for patching the kernel. This is what it looks like in 6.51 kernel: 

  a1b79:       0f 22 c0                mov    cr0,rax
  a1b7c:       48 a9 00 00 01 00       test   rax,0x10000
  a1b82:       75 02                   jne    a1b86 <-- skip the next instruction if CR0.WP is not cleared
  a1b84:       0f 0b                   ud2    <-- #UD exception, causes a kernel panic
  a1b86:       c3                      ret

Note that the check is after the write, to prevent a ROP gadget from pointing straight at the mov and skipping the verification.

Bypasses (in chronological order):

  • Execute an unintended "move to cr0" instruction in the middle of another instruction (e.g. instruction "call $+0x220f1c" (e8 17 0f 22 00) contains an unintended "mov cr0, rax" (0f 22 00))
  • Use kernel write to give your process JIT permissions, allocate JIT memory, and put entirely custom code there (avoids the problem altogether, as it is specific to ROP). This seems impossible on PS5 with a classic kernel exploit because of XOM.
  • Since the IDT (Interrupt Descriptor Table) is writable on FreeBSD, PS4 and PS5, it is possible to overwrite an exception handler without clearing CR0.WP first. One can overwrite the handler of #UD with a gadget of their choice (a stack pivot, or an "add rsp, ... ; ret" instruction, or whatever), then the UD2 instruction in the mitigation code will happily jump to it instead of the real handler, with CR0.WP cleared. To be precise, one must set up IDT handlers and point the IST (Interrupt Stack) to a ROP chain. It is required to poison the upper 16 bits of a pointer to make it non-canonical. Finally, write a custom page fault handler to run any kernel code you want. This technique proposed by sleirsgoevy since PS4 System Software version 6.51 was later adapted to PS5. However, this method slows down system performance compared to native execution because alone it can just run kernel ROP chains and it requires knowledge of gadgets positions. So on PS4, it is better to only use the IDT trick initially in a kernel exploit to patch kernel and allow non-ROP code execution for example by allowing JIT. On PS5, it is required to bypass XOM so an hypervisor exploit is required.

Secure Modules[edit | edit source]

<= ?7.55? - Missing HMAC key length check in Secure Kernel leading to Partial SAMU KeyRings bruteforce[edit | edit source]

Credits[edit | edit source]

  • Discovered by yifan lu (2017-02-19), plutoo and Proxima (2018-08-09), Davee (2018-12-29) for PS Vita, by flatz (2021-12-18) for PlayStation 4.

Bug description[edit | edit source]

The PS4 Crypto Coprocessor (CCP) interface in Secure Kernel has a bug that allows to dump (or better saying, bruteforce) key rings from SAMU. A crypto flaw was in the ability to issue HMAC operation with key length stricly lower than 16. For example, by setting it to 1 you can bruteforce key bytes one by one by comparing HMAC result with HMAC result with known partial key.

This trick may work on other crypto hardware as well if it does not restrict key lengths. Amazingly, Intel Secure Key Storage (SKS) of CSME subsystem also has a bug allowing to brute-force any key slot, but the issue exists at hardware level - insecure design of the keys distribution to crypto engines (AES, SHA, RC4). Intel did not recognize the bug arguing that to access SKS the CSME privileged arbitrary code execution is required, but SKS is exactly designed to protect the ROM generated keys from CSME firmware...

This exploit can be used to dump the PFS AES XTS and HMAC keys of a specific PS4 game PKG. Then one can use maxton's LibOrbisPkg or flatz's pkg_pfs_tool to unpack this PKG file.

It also lets one retrieve portability master keys. They decrypt blobs (stored in non-secure world, like in SceShellcore) that contain the portability keys.

Below is a sample code to dump some "raw" keys (as named by flatz). 

unsigned int key_count = 0x160;
unsigned int max_key_size = 0x40;
unsigned int *key_ids = (unsigned int *) malloc (key_count * 4);
unsigned int key_id = 0;
while (key_id < 0x160) {
    key_ids[key_id] = key_id;
    key_id++;
}
uint8_t* key_data = NULL;
size_t key_data_size = 0;
dump_raw_keys(key_ids, key_count, max_key_size, &key_data, &key_data_size);
hexdump(&key_data, &key_data_size);

A sample code to dump portability keys is available on line 908 of kpayload/source/samu_dump.c. Note that not all keys are used as some may be deprecated or added with System Software revisions.

Dumped savedata keys would be per-save, as the dumped key ring should only contain the derivated key (XTS) but not the one used to generate it.

Finally, one can retrieve its per-console VTRM keys (which are notably used for per-account securities like for act.dat and RIF).

However, master keyrings are the 0, 1, and 2 ones and cannot be dump them with this trick because they get locked during the bootprocess and cannot be read nor written nor copied to other keyrings. See also PS Vita keyrings.

Analysis[edit | edit source]

Implementation[edit | edit source]

Patched[edit | edit source]

Yes since a PS4 FW between 7.55 (unpatched) and 9.00 (patched).

<= 4.07 - Crashdumps encryption using symmetrical key and same key across software revisions[edit | edit source]

Credits[edit | edit source]

  • Discovered by ps4_enthusiast of fail0verflow (2017-12-27).

Bug description[edit | edit source]

The PS4 crashdumps encryption keys never changed between 1.01 and 3.15 FWs. Then between 3.50 and 4.07 FWs, Sony developers changed the keys many times but still used symmetrical key.

Analysis[edit | edit source]

Patched[edit | edit source]

Yes on PS4 FW 4.50 by using asymmetrical key. Tested between 1.01 and 4.07 PS4 FWs.

<= 3.70 - Reused keys lead to decryption of any PS4 1.00- 3.70 usermode SELF[edit | edit source]

Bug description[edit | edit source]

Sony reused encryption keys from System Software version 1.00 to 3.70 for PS4 usermode modules. As a result, any PS4 usermode module from those FWs can be decrypted on a PS4 running FW between 1.00 and 3.70.

Patched[edit | edit source]

Yes in 4.00 FW with the introduction of new keyset.

<= 2.50 - IDPS leak in sceSblAuthMgrDriveData on low retail FWs[edit | edit source]

Credits[edit | edit source]

  • Discovered by flatz (2018-08-27).

Bug analysis[edit | edit source]

By calling the sceSblAuthMgrDriveData kernel function on a PS4, which is a wrapper to the Authentication Secure Module associated fonction, it is possible to dump its IDPS (Console ID). It is possible because some PlayStation 4 operating system developer from Sony forgot to encrypt sceSblAuthMgrDriveData output by the Authentication Secure Module and that is how it was patched later. The PS4 IDPS is stored encrypted in an EID block in the Serial Flash.

To dump the PS4's IDPS, execute sceSblAuthMgrDriveData(0, in_buf, 0x160, out_buf, 0xA4, 1). Pass 0x160 bytes at 0x90C00 from sflash0s1.crypt into `in_buf` and dump `out_buf`.

Analysis[edit | edit source]

Implementation[edit | edit source]

Patched[edit | edit source]

Yes in PS4 3.00 retail FW. Works on any PS4 TestKit/DevKit FW.

<= ?1.62? - Missing version checks allow decryption of any GEN3 PUP[edit | edit source]

Credits[edit | edit source]

  • Discovered by flatz (2016).

Bug description[edit | edit source]

A bug in the Secure Module that handle PUP decryption allows any PS4 GEN3 on FW 1.62 or below to decrypt any GEN3 PUP (retail, TestKit, DevKit, Beta) with a version above 1.00 (post-prototype).https://github.com/SocraticBliss/ps4-pup_decrypt

The Secure Module mailbox code does not reset state after SMI checks failure, so to decrypt an arbitrary PUP, you need to ignore the mailbox error after executing the PupDecryptHeader command (1).

Implementation[edit | edit source]

Any PS4 PUP decryptor kernel payload that ignore the mailbox error could be used. See PUP#Decrypter_(first_step) for implementations.

Patched[edit | edit source]

Yes around PS4 FW 1.70.

Secure Kernel[edit | edit source]

<=?3.70? - Kernel ASLR collision leads to decrypted kernel partial leak - Matroska vulnerability[edit | edit source]

Credits[edit | edit source]

  • anonymous for sharing decrypted PS4 6.00b1 kernel file (2019-03-20)
  • shykelit for dumping 3.55 Jig PS4 kernel (2019-04-17)
  • zecoxao for discovering Matroska kernels and giving them that name (2019-04-18)
  • z80 for dumping 3.70 PS4 DevKit kernel (2019-04-18)
  • AlexAltea for reverse engineering kernel, ubios and vbios
  • Many people for sharing dumps of their PS4 kernels
  • CelesteBlue for backporting kernel exploits to dump PS4 4.74 kernel (2018-11-18), 3.50 (2019-05-09), 3.70 (2019-05-15) and 3.15 (2019-05-25)

Bug description[edit | edit source]

The kernel memory contains the kernel fSELF but with decrypted data, which in turn can be decompressed to grab ubios, vbios, kernel boot code and partial kernel.

By dumping PS4 kernel memory with a kernel exploit, in order to dump the x86 kernel, we sometimes find a strange fSELF. This fSELF is only partial: 1.5MB, but should be 17MB if it was the x86 kernel. Luckily it is only compressed, not encrypted. When uncompressing it using offzip, we can see only 1 segment. That is because the other segments have been cutted and the segment is incomplete. But we can see that it is the decrypted x86 kernel, as confirmed by diffing with anonymously shared decrypted full x86 kernel. In the decrypted x86 kernel, you can see a second ELF header. It is once again only compressed and not encrypted, and this is what zecoxao named the "Matroska kernel".

Sadly, this vulnerability is random, as it relies on kernel ASLR which is itself random. So depending on the System Software version, as modules have different sizes, kernel ASLR has more (100% on 3.15, 3.50 and 3.70) or less (1% on ?4.74?) chances to leak the Matroska kernel. It is unknown how we could improve this success rate. Maybe by instead of rebooting, causing a kernel panic or rebooting to recovery, entering rest mode then disconnecting power supply. A way to accelerate the process would be to scan kernel memory and check magics to see if there is a Matroska kernel. If there is, dump it, else reboot and cross fingers.

Note: vbios seems to be the same from 3.50 to 6.00b1 at least.

Analysis[edit | edit source]

Since PS4 3.50 FW, ASLR (Address Space Layout Randomization) has been enabled in PS4 kernel.

During PS4 boot, the following operations are executed:

  • the encrypted x86 kernel is loaded from Serial Flash
  • the secure kernel decrypt the x86 kernel SELF, without uncompressing it to some fixed address: at 0xFFFFFFFF84000000 in the case of 3.xx and 5.xx firmwares or 0xFFFFFFFFC4000000 in the case of 4.xx.
  • the secure kernel randomly chooses a base address for Kernel ASLR, starting from 0xFFFFFFFF80000000.
  • the secure kernel uncompresses the x86 kernel to the address determined by Kernel ASLR.

On some PS4 boots, Kernel ASLR base address can be very near of Matroska kernel address and the lack of memory separation and wipe renders the dump of Matroska kernel possible with only kernel memory read access.

Patched[edit | edit source]

Yes partially in 4.00 FW by increasing the kernel ASLR base address but it might have reappeared in newer versions like since 5.00 or 4.74, but with lower success rate.

It was also not present on 1.76 and below, so probably appeared when Sony worked on adding ASLR in PS4 Kernel. Also note that Matroska kernel is present on 3.15 even though there is no Kernel ASLR in this version.

Hardware[edit | edit source]

PCIe man-in-the-middle attack[edit | edit source]

  • First done on PS4 FW 1.01 by failoverflow on PS4 launch!
  • Detailed at 33c3: 33c3 slides by Marcan
  • Permits kernel and usermode dumping

Syscon glitching[edit | edit source]

It is possible to glitch the Syscon debug interface to allow access and dump keys. It was originally done by an anonymous member of fail0verflow.

Aeolia and Belize (Southbridge) SCA/DPA[edit | edit source]

Side Channel Analysis (SCA) with Differential Power Analysis (DPA) on Aeolia and Belize (PS4 Southbridge revisions) has been shown to be able to recover key material. Since Sony never used private/public key pairs, it is possible to exploit this and gain complete control over the Southbridge. You can attack the main FreeBSD kernel from here.

Nearly same methods are working on recent PS4 Pro motherboard NVB-003 that has Belize Southbridge (CXD90046GG).

Contrarly to Aeolia, Belize has ROM readout protection and clears stack which makes it more secure.

Old notes:

This is a hack to gain unsigned code execution on the Southbridge for all motherboard/console revisions. You might be able to glitch the EMC bootrom in order to bypass further signature checks and break the chain of trust. This hack might involve slowing down the Syscon clock. Timing the glitch based on SPI read accesses then either doing a power glitch or clock glitch to skip signature check. If the glitch fails, then we simply reset. This can be done with a very cheap CPLD/FPGA. Most Xbox 360 glitching modchips used a Xilinx Coolrunner because it is cheap and easy to use (board can cost as low as $5).

Related:

Arbitrary code execution in AMD SMU by incomplete hashing and bounds checking[edit | edit source]

Credits[edit | edit source]

  • Rudolf Marek discovered, disclosed to AMD then publicly through the following timeline:
    • Christmas 2013 - SMU firmware was analyzed from public AMD documentation
    • April 2014 - Bug was found in the SMU firmware
    • 2014-04-30 - Request to AMD sent
    • 2014-05-15 - Reply by AMD
    • 2014-05-16 - Encrypted communication, sending details
    • 2014-07-09 - AMD acknowledges the problem
    • In the meanwhile - Occasional communication
    • 2014-11-25 - AMD sends to Rudolf Marek a list of AMD AGESA versions which contain a fix

Bug description[edit | edit source]

A security vulnerability, discovered by Rudolf Marek in April 2014, in the recent AMD processors (Trinity and Richland, of FM2 socket) allows arbitrary code execution on the AMD System Management Unit (SMU).

It consists in two bugs in the SMU of AMD Trinity and Richland CPUs:

  • The AMD SMU firmware is not padded so some part (256 bytes) of the runtime firmware is not correctly covered by protection cover (0x55 0xaa ...).
  • The AMD SMU request function incorrectly checks bounds.

Similar, but not same problem affected AMD Kabini and Kaveri CPUs. It also likely affects PS4 as its APU is AMD Kabini/Jaguar.

Thanks to this vulnerability, the AMD SMU firmware can be dumped. From the dump, the Keys#AMD_SMU_Keys HMAC-SHA1 key was obtained.

Thanks to the knowledge of this key, the AMD SMU firmware could possibly be replaced by a custom one.

Analysis[edit | edit source]

Patched[edit | edit source]

Maybe after 2014-11-25, SMU vulnerability found by Rudolf Marek could have been patched on PS4 as AMD released patches: the fixed SMU firmware is part of updated AMD AGESA.

Untested - Arbitrary code execution in AMD SMU by custom firmware[edit | edit source]

Credits[edit | edit source]

  • Rudolf Marek for his exploit and documentation (2014)
  • zecoxao for public disclose (2023-05-17)

Bug description[edit | edit source]

It turns out that the "debug key" used to hash "debug" firmwares from AMD SMU effectively works on all retail (CEX) versions of the PS4 AMD SMU firmware as well.

According to zecoxao, as SMU is very privileged in PS4 (but not so privileged in PS5), one could probably dump his own PS4 keys/fuses with AMD SMU code execution. This could possibly lead to decryption of latest PS4 games, SEN access on PS4 running out-of-date System Software, conversion of any PS4 between CEX and DEX, as well as decrypting the PS4 Kernel and derived binaries.

Analysis[edit | edit source]

Patched[edit | edit source]

Maybe on recent PS4 firmwares with a BIOS update that would require a different and possibly more secure digest or signature.


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