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, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2742-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
ffmpeg (PTS)stretch7:3.2.14-1~deb9u1vulnerable
stretch (security)7:3.2.16-1+deb9u1fixed
buster7:4.1.8-0+deb10u1vulnerable
buster (security)7:4.1.9-0+deb10u1vulnerable
bullseye7:4.3.3-0+deb11u1fixed
bullseye (security)7:4.3.4-0+deb11u1fixed
bookworm, sid7:4.4.2-1fixed

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

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

Notes

[buster] - ffmpeg <postponed> (Wait for 4.1.9)
https://github.com/FFmpeg/FFmpeg/commit/3bce9e9b3ea35c54bacccc793d7da99ea5157532

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