The ff_ass_split_override_codes function in libavcodec/ass_split.c in FFmpeg before 1.0.2 allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a subtitle dialog without text.
"CWE-476: NULL Pointer Dereference"
AC:M for notation of file in bug report
" ffmpeg crashes reproducibly when converting files with some subtitles.
i've seen the crash with self-compiled ffmpeg 1.0 as well as the Mac OS X binary (linked to from the hompage) for 1.0.1.
download the sample file:
CVSS Severity (version 2.0):
Impact Subscore: 2.9
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable; Victim must voluntarily interact with attack mechanism
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows disruption of service
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Patch Information; Exploit
Vulnerable software and versions