Ubuntu Security Notice USN-1367-1
16th February, 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 verify the embedded profile
length of iCCP chunks. An attacker could exploit this to cause a denial of
service via application crash. This issue only affected Ubuntu 8.04 LTS.
Jueri Aedla discovered that libpng did not properly verify the size used
when allocating memory during chunk decompression. 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. (CVE-2011-3026)
The problem can be corrected by updating your system to the following package version:
- Ubuntu 11.10:
- libpng12-0 1.2.46-3ubuntu1.1
- Ubuntu 11.04:
- libpng12-0 1.2.44-1ubuntu3.2
- Ubuntu 10.10:
- libpng12-0 1.2.44-1ubuntu0.2
- Ubuntu 10.04 LTS:
- libpng12-0 1.2.42-1ubuntu2.3
- Ubuntu 8.04 LTS:
- libpng12-0 1.2.15~beta5-3ubuntu0.5
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.