==========================================================================
Ubuntu Security Notice USN-1333-1
January 17, 2012

libav vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 11.10
- Ubuntu 11.04

Summary:

Libav could be made to crash or run programs as your login if it opened a
specially crafted file.

Software Description:
- libav: Multimedia player, server, encoder and transcoder

Details:

Steve Manzuik discovered that Libav incorrectly handled certain malformed
Matroska files. If a user were tricked into opening a crafted Matroska
file, an attacker could cause a denial of service via application crash, or
possibly execute arbitrary code with the privileges of the user invoking
the program. This issue only affected Ubuntu 11.04. (CVE-2011-3504)

Phillip Langlois discovered that Libav incorrectly handled certain
malformed QDM2 streams. If a user were tricked into opening a crafted QDM2
stream file, an attacker could cause a denial of service via application
crash, or possibly execute arbitrary code with the privileges of the user
invoking the program. (CVE-2011-4351)

Phillip Langlois discovered that Libav incorrectly handled certain
malformed VP3 streams. If a user were tricked into opening a crafted file,
an attacker could cause a denial of service via application crash, or
possibly execute arbitrary code with the privileges of the user invoking
the program. (CVE-2011-4352)

Phillip Langlois discovered that Libav incorrectly handled certain
malformed VP5 and VP6 streams. If a user were tricked into opening a
crafted file, an attacker could cause a denial of service via application
crash, or possibly execute arbitrary code with the privileges of the user
invoking the program. (CVE-2011-4353)

It was discovered that Libav incorrectly handled certain malformed VMD
files. If a user were tricked into opening a crafted VMD file, an attacker
could cause a denial of service via application crash, or possibly execute
arbitrary code with the privileges of the user invoking the program.
(CVE-2011-4364)

Phillip Langlois discovered that Libav incorrectly handled certain
malformed SVQ1 streams. If a user were tricked into opening a crafted SVQ1
stream file, an attacker could cause a denial of service via application
crash, or possibly execute arbitrary code with the privileges of the user
invoking the program. (CVE-2011-4579)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 11.10:
  libavcodec53                    4:0.7.3-0ubuntu0.11.10.1
  libavformat53                   4:0.7.3-0ubuntu0.11.10.1

Ubuntu 11.04:
  libavcodec52                    4:0.6.4-0ubuntu0.11.04.1
  libavformat52                   4:0.6.4-0ubuntu0.11.04.1

This update uses a new upstream release, which includes additional bug
fixes. In general, a standard system update will make all the necessary
changes.

References:
  http://www.ubuntu.com/usn/usn-1333-1
  CVE-2011-3504, CVE-2011-4351, CVE-2011-4352, CVE-2011-4353,
  CVE-2011-4364, CVE-2011-4579

Package Information:
  https://launchpad.net/ubuntu/+source/libav/4:0.7.3-0ubuntu0.11.10.1
  https://launchpad.net/ubuntu/+source/libav/4:0.6.4-0ubuntu0.11.04.1