Ubuntu Security Notice USN-1402-1
22nd March, 2012
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
libpng could be made to crash or run programs as your login if it opened a specially crafted file.
- libpng - PNG (Portable Network Graphics) file library
It was discovered that libpng did not properly process compressed chunks.
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
The problem can be corrected by updating your system to the following package version:
- Ubuntu 11.10:
- libpng12-0 1.2.46-3ubuntu1.2
- Ubuntu 11.04:
- libpng12-0 1.2.44-1ubuntu3.3
- Ubuntu 10.10:
- libpng12-0 1.2.44-1ubuntu0.3
- Ubuntu 10.04 LTS:
- libpng12-0 1.2.42-1ubuntu2.4
- Ubuntu 8.04 LTS:
- libpng12-0 1.2.15~beta5-3ubuntu0.6
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to restart your session to make all
the necessary changes.