seregonwar/uaf-2023-28205PoC CVE-2023-28205: Apple WebKit 사용 후 해제 취약점
이 취약점은 Apple WebKit에 영향을 미치며, 악의적으로 조작된 웹 콘텐츠를 통해 WebKit 프로세스 컨텍스트에서 임의 코드 실행이 가능해질 수 있습니다.
이 리포지토리에서 분석된 영향받는 WebKit 빌드는 WebKit-613.1.17.1 (PlayStation / Safari 15.4 계열)을 기반으로 합니다.
PoC(Proof of Concept)는 구조화된 복제 작업 중 Map 및 Date와 같은 JavaScript 객체의 등록을 의도적으로 지연시켜 사용 후 해제(Use-After-Free, UAF) 조건을 유발합니다.
이러한 타이밍 창을 통해 JavaScriptCore 가비지 컬렉터(GC) 가 논리적으로 여전히 사용 중인 객체를 회수하여, 계속 실행되는 동안 오래된 포인터가 역참조됩니다.
SerializedScriptValueCloneDeserializer::deserialize()취약점은 구조화된 복제 역직렬화 로직, 특히 재귀적 역직렬화 중 새로 생성된 JavaScript 객체가 추적되는 방식에 있습니다.
SerializedScriptValue.cpp에서 역직렬화기는 다음과 같은 표준 WebKit 컨테이너를 사용합니다:
Vector<JSObject*, 32> outputObjectStack;
Vector<JSMap*, 4> mapStack;
Vector<JSSet*, 4> setStack;
이러한 Vector 컨테이너는 가비지 컬렉터가 스캔하지 않습니다. 역직렬화 중에 가비지 컬렉션 사이클이 트리거되면(예: 메모리 압력 또는 재진입 JS 실행으로 인해), 이러한 컨테이너에 의해서만 참조되는 객체가 잘못 수집될 수 있습니다.
그러나 역직렬화기는 계속해서 이러한 댕글링 포인터를 사용하여 사용 후 해제 조건이 발생합니다.
공식 WebKit 보안 패치(커밋 c9880de)는 이러한 컨테이너를 GC 인식 구조인 MarkedVector로 대체하여 해당 내용을 GC 루트로 적절히 등록합니다.
분석된 빌드에서:
MarkedVector는 구현되지 않음CloneDeserializer는 여전히 Vector를 사용이는 해당 빌드가 CVE-2023-28205에 완전히 취약함을 확인해줍니다.
다음 크래시는 PoC에 의해 안정적으로 발생했으며, GC 후 오래된 포인터 역참조와 일관됩니다.
SIGSEGV (11)0x0000000000000068SceNKWebProcesslibSceNKWebKit.sprx오류 주소 0x68은 객체-필드 오프셋이 있는 NULL 기본 포인터 역참조를 나타내며, 이는 해제된 JavaScript 객체에 접근하는 전형적인 특징입니다.
레지스터 상태가 다음을 확인합니다:
RAX = 0x0 (NULL 객체 베이스)이러한 크래시 동작은 위에서 설명한 CloneDeserializer UAF의 직접적인 발현입니다.
#
# A user thread receives a fatal signal
#
# signal: 11 (SIGSEGV)
# thread ID: 101395
# thread name: SceNKWebProcessMain
# proc ID: 88
# proc name: SceNKWebProcess
# reason: page fault (user read data, page not present)
# fault address: 0000000000000068
#
# registers:
# rax: 0000000000000000 rbx: 0000000000000000
# rcx: 000000020017e000 rdx: ffffffff00000000
# rsi: fffe000000000002 rdi: 0000000201d8c000
# rbp: 00000007eeff9f20 rsp: 00000007eeff9dc0
# r8 : 0000000200194c60 r9 : 00000002005ddc70
# r10: 0000000000000004 r11: 0000000000000000
# r12: 0000000200200000 r13: 0000000201d8c000
# r14: 0000000200880a00 r15: 0000000201d8c000
# rip: 0000000804d03bc1 eflags: 00010206
# BrF: 000000080424da9b BrT: 0000000804d03aa0
#
# backtrace:
copyin: SceNKWebProcessMain has nonsleeping lock
# 000000080424daa0
# 00000008052127b1
# 0000000805224b1b
# 0000000805224b1b
# 0000000805224b92
# 0000000805224b1b
# 0000000805208549
# 00000008037cd403
# 0000000803ed90a5
# 0000000804c48bd2
# 00000008045e2295
# 0000000804073b3b
# 000000080337f214
# 0000000802c62f61
# 0000000803e2b04b
# 0000000804645f82
# 000000080306ddc0
# 0000000803a06adb
# 0000000802e77528
# 0000000804281a70
# 0000000803bff887
# 0000000000405181
# 0000000000403d84
# 00000000004045ef
# 0000000000000000
#
# dynamic libraries:
# /goHvLUnT0D/common/lib/NKWebProcess.self
# text: 0000000000400000:0000000000408000 r-x
# data: 000000000040c000:0000000000410000 rw-
# fingerprint: 9f75275c0c9e6a8f512c46351676ba9c00000000
# /goHvLUnT0D/common/lib/libkernel_web.sprx
# text: 0000000800000000:0000000800050000 r-x
# data: 0000000800054000:000000080008c000 rw-
# fingerprint: 5cc7d026be64eb384dc8edd813cf5dff00000000
# /goHvLUnT0D/common/lib/libSceLibcInternal.sprx
# text: 000000080008c000:00000008001c0000 r-x
# data: 00000008001c8000:00000008001e4000 rw-
# fingerprint: 10c2fb20aecfba270ab36512cc6bcd3c00000000
# /goHvLUnT0D/common/lib/libSceSysmodule.sprx
# text: 00000008001e4000:00000008001f0000 r-x
# data: 00000008001f4000:0000000800200000 rw-
# fingerprint: d53329218364300cfc9ac1ce2f5f319000000000
# /goHvLUnT0D/common/lib/libScePosixForWebKit.sprx
# text: 0000000800200000:0000000800204000 r-x
# data: 0000000800208000:000000080020c000 rw-
# fingerprint: 2540b10c69fafebe19bf6c817f06a5dd00000000
# /goHvLUnT0D/common/lib/libcairo.sprx
# text: 000000080020c000:0000000800318000 r-x
# data: 0000000800320000:0000000800324000 rw-
# fingerprint: 66924f66c3b2bcfd5877f0b6b53b17c800000000
# /goHvLUnT0D/common/lib/libcurl.sprx
# text: 0000000800324000:00000008003d0000 r-x
# data: 00000008003d4000:00000008003d8000 rw-
# fingerprint: d07498e9ec79386fc781c8feeea9aa2800000000
# /goHvLUnT0D/common/lib/libfontconfig.sprx
# text: 00000008003d8000:0000000800450000 r-x
# data: 0000000800454000:0000000800458000 rw-
# fingerprint: f588f705527618061e0a9e633018197300000000
# /goHvLUnT0D/common/lib/libfreetype.sprx
# text: 0000000800458000:0000000800500000 r-x
# data: 0000000800508000:000000080050c000 rw-
# fingerprint: 55f0bf21e56f35c305acd791696e05b100000000
# /goHvLUnT0D/common/lib/libharfbuzz.sprx
# text: 000000080050c000:00000008005cc000 r-x
# data: 00000008005d0000:00000008005d4000 rw-
# fingerprint: 0e11f91a091308d571226554af07ce4000000000
# /goHvLUnT0D/common/lib/libicu.sprx
# text: 00000008005d4000:0000000802504000 r-x
# data: 0000000802524000:0000000802528000 rw-
# fingerprint: 1ef63fd860c70ff5f8744411e1ba581800000000
# /goHvLUnT0D/common/lib/libpng16.sprx
# text: 0000000802528000:000000080255c000 r-x
# data: 0000000802560000:0000000802564000 rw-
# fingerprint: 1bb1e4c3acb314d2dd52df2ca6a7a03e00000000
# /goHvLUnT0D/common/lib/libSceIpmi.sprx
# text: 0000000802564000:0000000802570000 r-x
# data: 0000000802574000:0000000802588000 rw-
# fingerprint: d5f95ff9044c26f90ff63c82fb0bbf5c00000000
# /goHvLUnT0D/common/lib/libSceSysCore.sprx
# text: 0000000802588000:0000000802590000 r-x
# data: 0000000802594000:0000000802598000 rw-
# fingerprint: d577567a554a7563ef2327c820bf0ee200000000
# /goHvLUnT0D/common/lib/libSceNet.sprx
# text: 0000000802598000:00000008025d0000 r-x
# data: 00000008025d4000:00000008026e8000 rw-
# fingerprint: 979f14da6d4c7aa75cdd4d4b2f3281c900000000
# /goHvLUnT0D/common/lib/libSceNetCtl.sprx
# text: 00000008026e8000:00000008026f0000 r-x
# data: 00000008026f4000:00000008026f8000 rw-
# fingerprint: 162fbdf7aa83706cc0992108ca3393ae00000000
# /goHvLUnT0D/common/lib/libSceRandom.sprx
# text: 00000008026f8000:00000008026fc000 r-x
# data: 0000000802700000:0000000802704000 rw-
# fingerprint: 976d3ebefe3870b97bfa1d8e82f1df2d00000000
# /goHvLUnT0D/common/lib/libSceLibreSsl3.sprx
# text: 0000000802704000:000000080288c000 r-x
# data: 00000008028ac000:00000008028b0000 rw-
# fingerprint: bd895ec678ab2becafd45e954fba828400000000
# /goHvLUnT0D/common/lib/libSceRegMgr.sprx
# text: 00000008028b0000:00000008028b4000 r-x
# data: 00000008028b8000:00000008028bc000 rw-
# fingerprint: 50fe32bc796e1dbda2337287e42091d100000000
# /goHvLUnT0D/common/lib/libSceSystemService.sprx
# text: 00000008028bc000:00000008028f8000 r-x
# data: 00000008028fc000:0000000802908000 rw-
# fingerprint: 6fead8bbcbbf7002bee44d4d2104c8d300000000
# /goHvLUnT0D/common/lib/libSceMbus.sprx
# text: 0000000802908000:0000000802914000 r-x
# data: 0000000802918000:000000080291c000 rw-
# fingerprint: eaf5e1ec79a60c0293ad42c039a9ff1a00000000
# /goHvLUnT0D/common/lib/libSceAvSetting.sprx
# text: 000000080291c000:0000000802928000 r-x
# data: 000000080292c000:0000000802930000 rw-
# fingerprint: 6a745bdbf97da42d23745852daa2afc700000000
# /goHvLUnT0D/common/lib/libSceVideoOut.sprx
# text: 0000000802930000:0000000802948000 r-x
# data: 000000080294c000:0000000802950000 rw-
# fingerprint: 504c9ecf78fdc9adf3fcd3721dc3975100000000
# /goHvLUnT0D/common/lib/libSceVideoCoreServerInterface.sprx
# text: 0000000802950000:0000000802960000 r-x
# data: 0000000802964000:000000080296c000 rw-
# fingerprint: 4613f400001d613dda147326d8ef133900000000
# /goHvLUnT0D/common/lib/libSceNKWebKitRequirements.sprx
# text: 000000080296c000:0000000802bdc000 r-x
# data: 0000000802be0000:0000000802be8000 rw-
# fingerprint: aa200eff9a5fd90b0c6f12853aa1cbd200000000
# /goHvLUnT0D/common/lib/libSceNKWebKit.sprx
# text: 0000000802be8000:00000008060b8000 r-x
# data: 00000008062c0000:00000008062f8000 rw-
# fingerprint: bc8a78e3ddb906f6d0de352329701c2600000000
# /goHvLUnT0D/common/lib/libSceGLSlimClientVSH.sprx
# text: 00000008062f8000:0000000806318000 r-x
# data: 000000080631c000:0000000806320000 rw-
# fingerprint: 1cea1ecf4ffd91dc02ca2b7bc92c3c0a00000000
<118>[Syscore App] App Crash : PID=0x58, reason=0xb
<118>[Syscore App] Syscore Event Queue Push : SCE_SYSCORE_EVENT_APP_CRASH
<118>[Syscore App] Syscore Event Queue Pop : SCE_SYSCORE_EVENT_APP_CRASH
<118>[SceLncService] AppCrash: pid={0x00000058} appId={0x60000201} appLocalPid={0x102012a5}
<118>[SceLncService] getCoredumpSequence() isDebuggable={0} isKeepProcess={1} isUserDebugRequest={0} isLimitKeepProcess={0} enableCrashReport={1}
<118>[SceLncService] CoredumpSequence = {DUMP_PROCESS}
<118>[SceLncService] getCoredumpMode() isSystem={0x00000001}, reason={0x0000000b}
<118>[SceLncService] notifyAppCrash() pid={0x00000058}, appId={0x60000201}, appLocalPid={0x102012a5}, coredump.path,name,mode={/user/data/sce_coredumps/NPXS20001_1767544376/,NPXS20001_1767544376.sorbisdmp,1}, enableCrashReport={1}, skipVshDump={0}
<118>[SceLncService] enableCrashReport={1}, crashReportMode={1}, isAllowed={0}
<118>[SceLncService] kick coredump is disabled.
<118>[Syscore App] Kill process: 0x58
<118>[VCS]closeSession() [APP->VCS] clientPid = 0x58.
<118>[Syscore App] EVFILT_PROC NOTE_EXIT received : pid=0x58
<118>[Syscore App] Kill process: 0x58 => 0
<118>[Syscore App] process delete event : pid=0x58
<118>[AppMgr Trace]: pid=0x58, deleted.
<118>[Syscore App] Syscore Event Queue Push : SCE_SYSCORE_EVENT_ON_PROCESS_UNLOADED
<118>[AppMgr] checkAppTerminated pid=0x2a is still alive in 0x60000201
<118>[Syscore App] Syscore Event Queue Pop : SCE_SYSCORE_EVENT_ON_PROCESS_UNLOADED
<118>[SceShellUI] W/PSM.UI : ** NOTICE: LoadSync : Parent_BrowserMain : FrameModalScene
<118>[SceShellUI] I/PSM.UI : OnFocusActiveSceneChanged [BrowserMain : MainScene] -> [Parent_BrowserMain : FrameModalScene]
<118>[SceShellUI] I/PSM.UI : Scene [Parent_BrowserMain : FrameModalScene] : Alive
<118>SetDeviceIndexBehavior: mode=SpecificUser, param=0x1a599820
<118>[Theme/I] : Apply [RED] : [Option:111111]: with preloaded user
<118>[SceShellCore] Libc Heap Status: free 38%, in-use 3794.3 KB, trend +18.1 KB/min, peak 4267.3 KB, when 19698 [sec]
<118>[SceShellCore] VM Stats: RSS 533.4, kernel 271.1, wire count 332.2, swap out 24.2, page table CPU 2526/6144 GPU 271/2048
이 취약점은 postMessage를 통해 접근 가능한 안정적인 UAF 프리미티브를 제공합니다:
postMessage를 통해 전송됨이를 통해 JavaScriptCore 내부 구조(예: StructureID, 버터플라이 포인터)의 제어된 메모리 손상이 가능해지며, 이 버그는 적절한 힙 셰이핑을 통해 안정적인 익스플로잇에 강력한 후보가 됩니다.
CVE-2023-28205는 Clément Lecigne (Google 위협 분석 그룹)과 Donncha Ó Cearbhaill (국제사면위원회 보안 연구소)에 의해 발견되었습니다.
원본 PoC 아이디어를 제공한 abc에게 감사드립니다.
ntfargo의 PoC 리포지토리 uaf-2023-28205 기반