Jon Larimer discovered that Evince"s font parsers incorrectly handled certain buffer lengths when rendering a DVI file. By tricking a user into opening or previewing a DVI file that uses a specially crafted font file, an attacker could crash evince or execute arbitrary code with the user"s privileges. In the default installation of Ubuntu 9.10 and later, attackers would be isolated by the Evince AppArmor profile.