Ubuntu Security Notice USN-472-1
11th June, 2007
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 7.04
- Ubuntu 6.10
- Ubuntu 6.06 LTS
It was discovered that libpng did not correctly handle corrupted CRC
in grayscale PNG images. By tricking a user into opening a specially
crafted PNG, a remote attacker could cause the application using libpng
to crash, resulting in a denial of service.
The problem can be corrected by updating your system to the following package version:
- Ubuntu 7.04:
- libpng12-0 1.2.15~beta5-1ubuntu1
- Ubuntu 6.10:
- libpng12-0 1.2.8rel-5.1ubuntu0.2
- Ubuntu 6.06 LTS:
- libpng12-0 1.2.8rel-5ubuntu0.2
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system upgrade you need to reboot your computer to
effect the necessary changes.