The render_line function in the vorbis codec (vorbis.c) in libavcodec in FFmpeg before 0.9.1 allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via a crafted Vorbis file, related to a large multiplier. NOTE: this vulnerability exists because of an incomplete fix for CVE-2011-3893.
https://exchange.xforce.ibmcloud.com/vulnerabilities/78925
http://www.ubuntu.com/usn/USN-1479-1
http://www.openwall.com/lists/oss-security/2012/02/14/4
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=6fcf2bb8af0e7d6bb179e71e67e5fab8ef0d2ec2