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Advisories

FFmpeg 2.1 - 8.1.2 Heap Buffer Overflow via VobSub Subtitle Demuxer

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severity
high
date
Affecting

  • FFmpeg >= 2.1, <= 8.1.2

CWE
  • CWE-122 Heap-based Buffer Overflow
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Pavel Kohout, Aisle Research
Description
FFmpeg versions 2.1 through 8.1.2 contain a heap buffer overflow vulnerability in the VobSub subtitle demuxer within libavformat/mpeg.c that allows attackers to corrupt adjacent heap memory by supplying a malicious .sub/.idx subtitle file declaring more distinct stream IDs than the fixed-size vobsub->q[] array can accommodate. Attackers can craft a subtitle file with excessive distinct stream IDs to trigger out-of-bounds writes via ff_subtitles_queue_insert(), potentially achieving arbitrary code execution in any application using FFmpeg's VobSub demuxer.

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