[libav-bugs] [Bug 1114] New: Libav - avcodec-58.dll - Heap overflow - Motion JPEG Video

bugzilla at libav.org bugzilla at libav.org
Wed Jan 31 01:58:05 CET 2018


https://bugzilla.libav.org/show_bug.cgi?id=1114

            Bug ID: 1114
           Summary: Libav - avcodec-58.dll - Heap overflow - Motion JPEG
                    Video
           Product: Libav
           Version: git HEAD
          Hardware: X86
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: ---
         Component: libavcodec
          Assignee: bugzilla at libav.org
          Reporter: jplopezy at gmail.com

Created attachment 706
  --> https://bugzilla.libav.org/attachment.cgi?id=706&action=edit
testcases and windbg

I was doing some fuzzing with the version of libav (to date) for windows
(windows 10 to date) and I found several vulnerabilities.

One of them is this, using a mov video file, with the codec (Motion JPEG Video)
At first I think it's a heap overflow.

After test with avplay.exe from last libav version with the testcase this
crash.

 Hash Usage : Stack Trace:
Major+Minor : avcodec_58!av_parser_close+0x1c221
Major+Minor : avcodec_58!av_d3d11va_alloc_context+0xe526
Major+Minor : avcodec_58!avcodec_send_packet+0xe8
Major+Minor : avcodec_58!avcodec_send_packet+0x170
Major+Minor : avplay+0xb030
Minor       : avplay!SDL_Delay+0x2f9
Minor       : avplay!SDL_EventState+0x354
Minor       : avplay!SDL_SetTimer+0x231
Minor       : msvcrt!beginthreadex+0x126
Minor       : msvcrt!endthreadex+0xac
Minor       : KERNEL32!BaseThreadInitThunk+0x14
Minor       : ntdll!RtlUserThreadStart+0x21
Instruction Address: 0x0000000065c14d81

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