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, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
ReferencesDLA-1611-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
ffmpeg (PTS)bullseye7:4.3.6-0+deb11u1fixed
bullseye (security)7:4.3.7-0+deb11u1fixed
bookworm, bookworm (security)7:5.1.5-0+deb12u1fixed
trixie7:6.1.1-4fixed
sid7:6.1.1-5fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
ffmpegsourcesqueeze(unfixed)end-of-life
ffmpegsource(unstable)7:2.7.2-1
libavsourcejessie6:11.12-1~deb8u2DLA-1611-1
libavsource(unstable)(unfixed)

Notes

[squeeze] - ffmpeg <end-of-life> (Not supported in Squeeze LTS)
https://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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