libavcodec/alsdec.c in FFmpeg before 1.0.4 allows remote attackers to have an unspecified impact via a crafted block length, which triggers an out-of-bounds write.
http://www.ffmpeg.org/security.html
http://www.debian.org/security/2014/dsa-2855
http://git.videolan.org/?p=ffmpeg.git%3Ba=commitdiff%3Bh=6df0d3e2916c223dbe4262bf1b876dff1cb3f980
http://git.videolan.org/?p=ffmpeg.git%3Ba=commit%3Bh=0ceca269b66ec12a23bf0907bd2c220513cdbf16