Referenced CVEs: 
CVE-2006-5111
Description: 
=========================================================== Ubuntu Security Notice USN-365-1 October 16, 2006 libksba vulnerability CVE-2006-5111 =========================================================== A security issue affects the following Ubuntu releases: Ubuntu 5.04 This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu. The problem can be corrected by upgrading your system to the following package versions: Ubuntu 5.04: libksba8 0.9.9-2ubuntu0.5.04 After a standard system upgrade you need to restart your session to effect the necessary changes. Details follow: A parsing failure was discovered in the handling of X.509 certificates that contained extra trailing data. Malformed or malicious certificates could cause services using libksba to crash, potentially creating a denial of service.