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Ubuntu: Security update for Libav

It was discovered that Libav incorrectly handled certain malformed media files. If a user were tricked into opening a crafted media 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.

Updated packages are available from security.ubuntu.com.

==========================================================================
Ubuntu Security Notice USN-1630-1
November 12, 2012

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

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

- Ubuntu 12.10
- Ubuntu 12.04 LTS

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:

It was discovered that Libav incorrectly handled certain malformed media
files. If a user were tricked into opening a crafted media 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.

Update instructions:

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

Ubuntu 12.10:
 libavcodec53                    6:0.8.4-0ubuntu0.12.10.1
 libavformat53                   6:0.8.4-0ubuntu0.12.10.1

Ubuntu 12.04 LTS:
 libavcodec53                    4:0.8.4-0ubuntu0.12.04.1
 libavformat53                   4:0.8.4-0ubuntu0.12.04.1

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-1630-1
 CVE-2012-2772, CVE-2012-2775, CVE-2012-2776, CVE-2012-2777,
 CVE-2012-2779, CVE-2012-2784, CVE-2012-2786, CVE-2012-2787,
 CVE-2012-2788, CVE-2012-2789, CVE-2012-2790, CVE-2012-2793,
 CVE-2012-2794, CVE-2012-2796, CVE-2012-2798, CVE-2012-2800,
 CVE-2012-2801, CVE-2012-2802

Package Information:
 https://launchpad.net/ubuntu/+source/libav/6:0.8.4-0ubuntu0.12.10.1
 https://launchpad.net/ubuntu/+source/libav/4:0.8.4-0ubuntu0.12.04.1
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