=========================================================================Ubuntu Security Notice USN-1417-1
April 05, 2012

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

- Ubuntu 11.10
- Ubuntu 11.04
- Ubuntu 10.10
- Ubuntu 10.04 LTS
- Ubuntu 8.04 LTS

Summary:

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

Software Description:
- libpng: PNG (Portable Network Graphics) file library

Details:

It was discovered that libpng incorrectly handled certain memory
operations. If a user or automated system using libpng were tricked into
opening a specially crafted image, an attacker could exploit this to cause
a denial of service or execute 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 11.10:
  libpng12-0                      1.2.46-3ubuntu1.3

Ubuntu 11.04:
  libpng12-0                      1.2.44-1ubuntu3.4

Ubuntu 10.10:
  libpng12-0                      1.2.44-1ubuntu0.4

Ubuntu 10.04 LTS:
  libpng12-0                      1.2.42-1ubuntu2.5

Ubuntu 8.04 LTS:
  libpng12-0                      1.2.15~beta5-3ubuntu0.7

After a standard system update you need to restart your session to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-1417-1
  CVE-2011-3048

Package Information:
  https://launchpad.net/ubuntu/+source/libpng/1.2.46-3ubuntu1.3
  https://launchpad.net/ubuntu/+source/libpng/1.2.44-1ubuntu3.4
  https://launchpad.net/ubuntu/+source/libpng/1.2.44-1ubuntu0.4
  https://launchpad.net/ubuntu/+source/libpng/1.2.42-1ubuntu2.5
  https://launchpad.net/ubuntu/+source/libpng/1.2.15~beta5-3ubuntu0.7