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Adobe Acrobat Reader DC for Windows - Heap-Based Buffer Overflow While Processing Malformed PDF



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We have observed the following access violation exception in the latest version of Adobe Acrobat Reader DC for Windows, when opening a malformed PDF file:

--- cut ---
(36ec.3210): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=fffff987 ebx=f8519200 ecx=290cc000 edx=290c8fbc esi=28f43098 edi=fffff851
eip=645412f9 esp=1390d9e4 ebp=00000014 iopl=0         nv up ei ng nz na pe nc
cs=0023  ss=002b  ds=002b  es=002b  fs=0053  gs=002b             efl=00010286
645412f9 8911            mov     dword ptr [ecx],edx  ds:002b:290cc000=????????

0:023> !heap -p -a ecx-8
    address 290cbff8 found in
    _DPH_HEAP_ROOT @ bc51000
    in busy allocation (  DPH_HEAP_BLOCK:         UserAddr         UserSize -         VirtAddr         VirtSize)
                                 bc53d9c:         28c10090           4bbf70 -         28c10000           4bd000
    66d6a8d0 verifier!AVrfDebugPageHeapAllocate+0x00000240
    77304b26 ntdll!RtlDebugAllocateHeap+0x0000003c
    7725e3e6 ntdll!RtlpAllocateHeap+0x000000f6
    7725cfb7 ntdll!RtlpAllocateHeapInternal+0x000002b7
    7725ccee ntdll!RtlAllocateHeap+0x0000003e
    66e5aa2f vrfcore!VfCoreRtlAllocateHeap+0x0000001f
    74a2f1f6 ucrtbase!_malloc_base+0x00000026
    0e75fcd9 AcroRd32!AcroWinMainSandbox+0x00003ed9
    64531c72 AGM!AGMInitialize+0x00048e42
0:023> kb
 # ChildEBP RetAddr  Args to Child              
WARNING: Stack unwind information not available. Following frames may be wrong.
00 1390da28 77240a31 07bb5958 64540190 1390daac AGM!AGMInitialize+0x584c9
01 1390da9c 74a2f1f6 f238e0c0 07bb5958 0dc0fc40 ntdll!RtlCaptureStackBackTrace+0x41
02 1390dab8 0e75fcd9 004bbf70 0e75fcc0 6451f0bd ucrtbase!_malloc_base+0x26
03 1390db54 6451e588 12b91f98 0000047b 00000001 AcroRd32!AcroWinMainSandbox+0x3ed9
04 1390db58 12b91f98 0000047b 00000001 00000000 AGM!AGMInitialize+0x35758
05 1390db5c 00000000 00000001 00000000 17191e14 0x12b91f98
--- cut ---


- Reproduces on Adobe Acrobat Reader DC (2019.012.20035) on Windows 10, with and without PageHeap enabled. Without PageHeap, the crash may also be triggered in ntdll!RtlReportCriticalFailure, if the system allocator detects a corrupted chunk.

- The crash is caused by a heap-based buffer overflow and occurs immediately after opening the PDF document (poc1.pdf), or with a bit of interaction (scrolling to other pages, zooming in and out) for poc2.pdf and poc3.pdf.

- We classify the bug as a potential RCE.

Proof of Concept:
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