Ubuntu Security Notice 648-1 – Philipp Thomas discovered that the ppscan function of nasm contained an off-by-one error. If a user or automated system were tricked into assembling a specially crafted ASM file, a remote attacker could execute arbitrary commands with user privileges.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/70511/USN-648-1.txt
Source: https://packetstormsecurity.com/files/70511/Ubuntu-Security-Notice-648-1.html