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"Apple macOS < 10.14.5 / iOS < 12.3 DFG JIT Compiler - 'HasIndexedProperty' Use-After-Free"

Author

Exploit author

"Google Security Research"

Platform

Exploit platform

multiple

Release date

Exploit published date

2019-05-21

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See also  https://bugs.chromium.org/p/project-zero/issues/detail?id=1699 for a similar issue.

The DFG JIT compiler attempts to determine whether a DFG IR operation could cause garbage collection (GC) during its execution [1]. With this, it is then possible for the compiler to determine whether there could be a GC between point A and point B in a function, which in turn can be used to omit write barriers (see e.g. https://v8.dev/blog/concurrent-marking#reducing-marking-pause for an explanation of write barriers) [2]. For example, in case an (incremental) GC cannot happen between an allocation of an object and a property store to it, the write barrier after the property store can be omitted (because in that case the newly allocated object could not already have been marked, so must be white). However, if the analysis is incorrect and a GC can happen in between, then the emitted code can cause use-after-free issues, e.g. if an unmarked (white) object is assigned as property to an object that was marked during an unexpected GC (and is thus black).

Since commit  9725889d5172a204aa1120e06be9eab117357f4b [3] "Add code to validate expected GC activity modelled by doesGC() against what the runtime encounters", JSC, in debug builds, asserts that the information computed by doesGC is correct: "In DFG::SpeculativeJIT::compile() and FTL::LowerDFGToB3::compileNode(), before emitting code / B3IR for each DFG node, we emit a write to set Heap::m_expectDoesGC to the value returned by doesGC() for that node. In the runtime (i.e. in allocateCell() and functions that can resolve a rope), we assert that Heap::m_expectDoesGC is true.". The following sample (found through fuzzing and then simplified), triggers such an assertion:

    function f(a) {
        return 0 in a;
    }
    for (let i = 0; i < 100000; i++) {
        const s = new String('asdf');
        s[42] = 'x';                   // Give it ArrayStorage
        f(s);
    }

Here, the `in` operation is converted to a HasIndexedProperty DFG operation [4]. Since the String object has ArrayStorage (due to the additional element), DFGClobberize will report that it does not write to the heap [5]. Afterwards, doesGC reports that the operation cannot trigger GC [6]. However, during the execution of the operation (in the DFG JIT implemented by a call to operationHasIndexedPropertyByInt [7]) the code ends up in JSString::getIndex (to determine whether the index is valid in the underlying string), which can end up flattening a rope string, thus causing a heap allocation and thus potentially causing garbage collection. This is where, in debug builds, the assertion fails:

    ASSERTION FAILED: vm()->heap.expectDoesGC()
    ../../Source/JavaScriptCore/runtime/JSString.h(1023) : WTF::StringView JSC::JSString::unsafeView(JSC::ExecState *) const
    1   0x10d67e769 WTFCrash
    2   0x10bb6948b WTFCrashWithInfo(int, char const*, char const*, int)
    3   0x10bba9e59 JSC::JSString::unsafeView(JSC::ExecState*) const
    4   0x10bba9c6e JSC::JSString::getIndex(JSC::ExecState*, unsigned int)
    5   0x10c712a24 JSC::JSString::getStringPropertySlot(JSC::ExecState*, unsigned int, JSC::PropertySlot&)
    6   0x10d330b90 JSC::StringObject::getOwnPropertySlotByIndex(JSC::JSObject*, JSC::ExecState*, unsigned int, JSC::PropertySlot&)
    7   0x10bbaa368 JSC::JSObject::getPropertySlot(JSC::ExecState*, unsigned int, JSC::PropertySlot&)
    8   0x10d20d831 JSC::JSObject::hasPropertyGeneric(JSC::ExecState*, unsigned int, JSC::PropertySlot::InternalMethodType) const
    9   0x10c70132f operationHasIndexedPropertyByInt
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2020-05-27"osTicket 1.14.1 - 'Saved Search' Persistent Cross-Site Scripting"webappsphp"Matthew Aberegg"
2020-05-27"OXID eShop 6.3.4 - 'sorting' SQL Injection"webappsphpVulnSpy
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2020-05-28"NOKIA VitalSuite SPM 2020 - 'UserName' SQL Injection"webappsmultiple"Berk Dusunur"
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2020-04-16"Apache Solr - Remote Code Execution via Velocity Template (Metasploit)"remotemultipleMetasploit
Release DateTitleTypePlatformAuthor
2020-02-10"iOS/macOS - Out-of-Bounds Timestamp Write in IOAccelCommandQueue2::processSegmentKernelCommand()"dosmultiple"Google Security Research"
2020-02-10"usersctp - Out-of-Bounds Reads in sctp_load_addresses_from_init"doslinux"Google Security Research"
2020-01-28"macOS/iOS ImageIO - Heap Corruption when Processing Malformed TIFF Image"dosmultiple"Google Security Research"
2020-01-14"Android - ashmem Readonly Bypasses via remap_file_pages() and ASHMEM_UNPIN"dosandroid"Google Security Research"
2020-01-14"WeChat - Memory Corruption in CAudioJBM::InputAudioFrameToJBM"dosandroid"Google Security Research"
2019-12-18"macOS 10.14.6 (18G87) - Kernel Use-After-Free due to Race Condition in wait_for_namespace_event()"dosmacos"Google Security Research"
2019-12-16"Linux 5.3 - Privilege Escalation via io_uring Offload of sendmsg() onto Kernel Thread with Kernel Creds"locallinux"Google Security Research"
2019-12-11"Adobe Acrobat Reader DC - Heap-Based Memory Corruption due to Malformed TTF Font"doswindows"Google Security Research"
2019-11-22"Internet Explorer - Use-After-Free in JScript Arguments During toJSON Callback"doswindows"Google Security Research"
2019-11-22"macOS 10.14.6 - root->kernel Privilege Escalation via update_dyld_shared_cache"localmacos"Google Security Research"
2019-11-20"Ubuntu 19.10 - Refcount Underflow and Type Confusion in shiftfs"doslinux"Google Security Research"
2019-11-20"iOS 12.4 - Sandbox Escape due to Integer Overflow in mediaserverd"dosios"Google Security Research"
2019-11-20"Ubuntu 19.10 - ubuntu-aufs-modified mmap_region() Breaks Refcounting in overlayfs/shiftfs Error Path"doslinux"Google Security Research"
2019-11-11"iMessage - Decoding NSSharedKeyDictionary can read ObjC Object at Attacker Controlled Address"dosmultiple"Google Security Research"
2019-11-11"Adobe Acrobat Reader DC for Windows - Use of Uninitialized Pointer due to Malformed JBIG2Globals Stream"doswindows"Google Security Research"
2019-11-11"Adobe Acrobat Reader DC for Windows - Use of Uninitialized Pointer due to Malformed OTF Font (CFF Table)"doswindows"Google Security Research"
2019-11-05"macOS XNU - Missing Locking in checkdirs_callback() Enables Race with fchdir_common()"dosmacos"Google Security Research"
2019-11-05"WebKit - Universal XSS in JSObject::putInlineSlow and JSValue::putToPrimitive"dosmultiple"Google Security Research"
2019-11-05"JavaScriptCore - Type Confusion During Bailout when Reconstructing Arguments Objects"dosmultiple"Google Security Research"
2019-10-30"JavaScriptCore - GetterSetter Type Confusion During DFG Compilation"dosmultiple"Google Security Research"
2019-10-28"WebKit - Universal XSS in HTMLFrameElementBase::isURLAllowed"dosmultiple"Google Security Research"
2019-10-21"Adobe Acrobat Reader DC for Windows - Heap-Based Buffer Overflow due to Malformed JP2 Stream (2)"doswindows"Google Security Research"
2019-10-10"Windows Kernel - Out-of-Bounds Read in CI!CipFixImageType While Parsing Malformed PE File"doswindows"Google Security Research"
2019-10-10"Windows Kernel - Out-of-Bounds Read in CI!HashKComputeFirstPageHash While Parsing Malformed PE File"doswindows"Google Security Research"
2019-10-10"Windows Kernel - win32k.sys TTF Font Processing Pool Corruption in win32k!ulClearTypeFilter"doswindows"Google Security Research"
2019-10-10"Windows Kernel - NULL Pointer Dereference in nt!MiOffsetToProtos While Parsing Malformed PE File"doswindows"Google Security Research"
2019-10-10"Windows Kernel - Out-of-Bounds Read in nt!MiParseImageLoadConfig While Parsing Malformed PE File"doswindows"Google Security Research"
2019-10-10"Windows Kernel - Out-of-Bounds Read in nt!MiRelocateImage While Parsing Malformed PE File"doswindows"Google Security Research"
2019-10-09"XNU - Remote Double-Free via Data Race in IPComp Input Path"dosmacos"Google Security Research"
2019-10-04"Android - Binder Driver Use-After-Free"localandroid"Google Security Research"
import requests
response = requests.get('https://www.nmmapper.com/api/exploitdetails/46888/?format=json')

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