Input validation error in FFmpeg and Libav - CVE-2011-3952

Vulnerability identifier: #VU43702

CSH Severity: Medium

CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2011-3952

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

The decode_init function in kmvc.c in libavcodec in FFmpeg before 0.10 and in Libav 0.5.x before 0.5.9, 0.6.x before 0.6.6, 0.7.x before 0.7.6, and 0.8.x before 0.8.1 allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via a large palette size in a KMVC encoded file.

FFmpeg
Libav
Gentoo Linux
Ubuntu
libavcodec52 (Ubuntu package)
libavformat52 (Ubuntu package)
libavcodec53 (Ubuntu package)
libavformat53 (Ubuntu package)

Install update from vendor's website.

libavcodec52 (Ubuntu package) - addressed in versions 4:0.5.9-0ubuntu0.10.04.1, 4:0.6.6-0ubuntu0.11.04.1
libavformat52 (Ubuntu package) - addressed in versions 4:0.5.9-0ubuntu0.10.04.1, 4:0.6.6-0ubuntu0.11.04.1
libavcodec53 (Ubuntu package) - addressed in versions 4:0.7.6-0ubuntu0.11.10.1, 4:0.8.3-0ubuntu0.12.04.1
libavformat53 (Ubuntu package) - addressed in versions 4:0.7.6-0ubuntu0.11.10.1, 4:0.8.3-0ubuntu0.12.04.1

• http://ffmpeg.org/
• http://git.libav.org/?p=libav.git;a=commit;h=386741f887714d3e46c9e8fe577e326a7964037b
• http://libav.org/
• http://www.debian.org/security/2012/dsa-2494
• http://www.ubuntu.com/usn/USN-1479-1

• Gentoo update for Libav
• Ubuntu update for ffmpeg
• Ubuntu update for libav