Ubuntu Update for libxml2 vulnerabilities USN-644-1

Summary
Ubuntu Update for Linux kernel vulnerabilities USN-644-1
Solution
Please Install the Updated Packages.
Insight
It was discovered that libxml2 did not correctly handle long entity names. If a user were tricked into processing a specially crafted XML document, a remote attacker could execute arbitrary code with user privileges or cause the application linked against libxml2 to crash, leading to a denial of service. (CVE-2008-3529) USN-640-1 fixed vulnerabilities in libxml2. When processing extremely large XML documents with valid entities, it was possible to incorrectly trigger the newly added vulnerability protections. This update fixes the problem. (CVE-2008-3281)
Affected
libxml2 vulnerabilities on Ubuntu 6.06 LTS , Ubuntu 7.04 , Ubuntu 7.10 , Ubuntu 8.04 LTS