USN-472-1: libpng vulnerability

Ubuntu Security Notice USN-472-1

11th June, 2007

libpng vulnerability

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.

Update instructions

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:

After a standard system upgrade you need to reboot your computer to
effect the necessary changes.