Ubuntu Security Notice USN-835-1 – Joe Orton discovered that neon 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/81507/USN-835-1.txt
Source: https://packetstormsecurity.com/files/81507/Ubuntu-Security-Notice-835-1.html