Ubuntu Security Notice USN-135-1 – Tavis Ormandy found an integer overflow in the GNU debugger. By tricking an user into merely load a specially crafted executable, an attacker could exploit this to execute arbitrary code with the privileges of the user running gdb. However, loading untrusted binaries without actually executing them is rather uncommon, so the risk of this flaw is low.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/39338/USN-135-1.txt
Source: https://packetstormsecurity.com/files/39338/Ubuntu-Security-Notice-135-1.html