CVE-2019-9718

NameCVE-2019-9718
DescriptionIn FFmpeg 4.1, a denial of service in the subtitle decoder allows attackers to hog the CPU via a crafted video file in Matroska format, because ff_htmlmarkup_to_ass in libavcodec/htmlsubtitles.c has a complex format argument to sscanf.
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)
ReferencesDSA-4449-1
NVD severitymedium (attack range: remote)
Debian Bugs926666

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
ffmpeg (PTS)stretch7:3.2.12-1~deb9u1vulnerable
stretch (security)7:3.2.14-1~deb9u1fixed
buster7:4.1.3-1fixed
buster (security)7:4.1.4-1~deb10u1fixed
bullseye, sid7:4.1.4-1fixed
libav (PTS)jessie6:11.12-1~deb8u1fixed
jessie (security)6:11.12-1~deb8u7fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
ffmpegsource(unstable)7:4.1.3-1low926666
ffmpegsourcestretch7:3.2.14-1~deb9u1mediumDSA-4449-1
libavsource(unstable)(unfixed)medium
libavsourcejessie(not affected)

Notes

https://git.ffmpeg.org/gitweb/ffmpeg.git/commit/1f00c97bc3475c477f3c468cf2d924d5761d0982
[jessie] - libav <not-affected> (Vulnerable code not present)

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