Ubuntu Update for libxml2 vulnerability USN-640-1

Summary
Ubuntu Update for Linux kernel vulnerabilities USN-640-1
Solution
Please Install the Updated Packages.
Insight
Andreas Solberg discovered that libxml2 did not handle recursive entities safely. If an application linked against libxml2 were made to process a specially crafted XML document, a remote attacker could exhaust the system's CPU resources, leading to a denial of service.
Affected
libxml2 vulnerability on Ubuntu 6.06 LTS , Ubuntu 7.04 , Ubuntu 7.10 , Ubuntu 8.04 LTS