CVE-2021-3566

NameCVE-2021-3566
DescriptionPrior to ffmpeg version 4.3, the tty demuxer did not have a 'read_probe' function assigned to it. By crafting a legitimate "ffconcat" file that references an image, followed by a file the triggers the tty demuxer, the contents of the second file will be copied into the output file verbatim (as long as the `-vcodec copy` option is passed to ffmpeg).
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-2742-1, DSA-5126-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
ffmpeg (PTS)bullseye7:4.3.7-0+deb11u1fixed
bullseye (security)7:4.3.8-0+deb11u1fixed
bookworm, bookworm (security)7:5.1.6-0+deb12u1fixed
sid, trixie7:7.1-3fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
ffmpegsourcestretch7:3.2.15-0+deb9u3DLA-2742-1
ffmpegsourcebuster7:4.1.9-0+deb10u1DSA-5126-1
ffmpegsource(unstable)7:4.3-2

Notes

https://github.com/FFmpeg/FFmpeg/commit/3bce9e9b3ea35c54bacccc793d7da99ea5157532 (4.3)
https://github.com/FFmpeg/FFmpeg/commit/97ee4a451b5b1eb0010664b4a8c048d6c8c06a8a (4.1.9)
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