USN-383-1: libpng vulnerability

Ubuntu Security Notice USN-383-1

17th November, 2006

libpng vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 6.10
  • Ubuntu 6.06 LTS
  • Ubuntu 5.10


Tavis Ormandy discovered that libpng did not correctly calculate the
size of sPLT structures when reading an image. By tricking a user or an
automated system into processing a specially crafted PNG file, an
attacker could exploit this weakness to crash the application using the

Update instructions

The problem can be corrected by updating your system to the following package version:

Ubuntu 6.10:
libpng12-0 1.2.8rel-5.1ubuntu0.1
Ubuntu 6.06 LTS:
libpng12-0 1.2.8rel-5ubuntu0.1
Ubuntu 5.10:
libpng10-0 1.0.18-1ubuntu3.1

To update your system, please follow these instructions:

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