Referenced CVEs:

================================================== ========= Ubuntu Security Notice USN-552-1 December 04, 2007 perl vulnerability CVE-2007-5116 ================================================== ========= A security issue affects the following Ubuntu releases: Ubuntu 6.06 LTS Ubuntu 6.10 Ubuntu 7.04 Ubuntu 7.10 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 6.06 LTS: libperl5.8 5.8.7-10ubuntu1.1 Ubuntu 6.10: libperl5.8 5.8.8-6ubuntu0.1 Ubuntu 7.04: libperl5.8 5.8.8-7ubuntu0.1 Ubuntu 7.10: libperl5.8 5.8.8-7ubuntu3.1 In general, a standard system upgrade is sufficient to effect the necessary changes. Details follow: It was discovered that Perl's regular expression library did not correctly handle certain UTF sequences. If a user or automated system were tricked into running a specially crafted regular expression, a remote attacker could crash the application or possibly execute arbitrary code with user privileges.