Ubuntu Security Notice 876-1 – It was discovered that PostgreSQL did not properly handle certificates with NULL characters in the Common Name field of X.509 certificates. An attacker could exploit this to perform a man in the middle attack to view sensitive information or alter encrypted communications. It was discovered that PostgreSQL did not properly manage session-local state. A remote authenticated user could exploit this to escalate privileges within PostgreSQL.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/84734/USN-876-1.txt
Source: https://packetstormsecurity.com/files/84734/Ubuntu-Security-Notice-876-1.html