ffmpeg - several

Multiple vulnerabilities were found in FFmpeg, a multimedia player,
server and encoder:

• CVE-2011-3362
  An integer signedness error in decode_residual_block function of
  the Chinese AVS video (CAVS) decoder in libavcodec can lead to
  denial of service (memory corruption and application crash) or
  possible code execution via a crafted CAVS file.
• CVE-2011-3973/CVE-2011-3974
  Multiple errors in the Chinese AVS video (CAVS) decoder can lead to
  denial of service (memory corruption and application crash) via an
  invalid bitstream.
• CVE-2011-3504
  A memory allocation problem in the Matroska format decoder can lead
  to code execution via a crafted file.

For the stable distribution (squeeze), this problem has been fixed in
version 4:0.5.5-1.

For the unstable distribution (sid), this problem has been fixed in
version 4:0.7.2-1 of the libav source package.

Security support for ffmpeg has been discontinued for the oldstable
distribution (lenny) before in DSA 2306.
The current version in oldstable is not supported by upstream anymore
and is affected by several security issues. Backporting fixes for these
and any future issues has become unfeasible and therefore we needed to
drop our security support for the version in oldstable.

We recommend that you upgrade your ffmpeg packages.