| Name | CVE-2015-6818 |
| Description | The 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. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-1611-1 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| ffmpeg (PTS) | bullseye | 7:4.3.7-0+deb11u1 | fixed |
| bullseye (security) | 7:4.3.8-0+deb11u1 | fixed |
| bookworm, bookworm (security) | 7:5.1.6-0+deb12u1 | fixed |
| sid, trixie | 7:7.1-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| ffmpeg | source | squeeze | (unfixed) | end-of-life | | |
| ffmpeg | source | (unstable) | 7:2.7.2-1 | | | |
| libav | source | jessie | 6:11.12-1~deb8u2 | | DLA-1611-1 | |
| libav | source | (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