CVE-2015-6818

NameCVE-2015-6818
DescriptionThe decode_ihdr_chunk function in libavcodec/pngdec.c in FFmpeg before 2.7.2 does not enforce uniqueness of the IHDR (aka image header) chunk in a PNG image, which allows remote attackers to cause a denial of service (out-of-bounds array access) or possibly have unspecified other impact via a crafted image with two or more of these chunks.
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)
NVD severityhigh (attack range: remote)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
ffmpeg (PTS)stretch (security), stretch7:3.2.12-1~deb9u1fixed
buster, sid7:4.0.3-1fixed
libav (PTS)jessie (security), jessie6:11.12-1~deb8u1vulnerable

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
ffmpegsource(unstable)7:2.7.2-1high
ffmpegsourcesqueeze(unfixed)end-of-life
libavsource(unstable)(unfixed)high

Notes

[squeeze] - ffmpeg <end-of-life> (Not supported in Squeeze LTS)
http://git.videolan.org/?p=ffmpeg.git;a=commitdiff;h=47f4e2d8960ca756ca153ab8e3e93d80449b8c91
For libav in jessie, the patch needs to go into the decode_frame() function in libavcodec/pngdec.c

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