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USN-472-1: libpng vulnerability

12 June 2007

libpng vulnerability



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 versions:

Ubuntu 7.04
  • libpng12-0 - 1.2.15~beta5-1ubuntu1
Ubuntu 6.10
  • libpng12-0 - 1.2.8rel-5.1ubuntu0.2
Ubuntu 6.06
  • libpng12-0 - 1.2.8rel-5ubuntu0.2

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