Ubuntu Security Notice 858-1 – It was discovered that OpenLDAP did not correctly handle SSL certificates with zero bytes in the Common Name. A remote attacker could exploit this to perform a man in the middle attack to view sensitive information or alter encrypted communications.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/82682/USN-858-1.txt
Source: https://packetstormsecurity.com/files/82682/Ubuntu-Security-Notice-858-1.html