This advisory also applies to the corresponding versions of Kubuntu, Edubuntu, and Xubuntu.
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.
Solution: 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.