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USN-383-1: libpng vulnerability

17 November 2006

libpng vulnerability



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 versions:

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

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