Ubuntu Security Notice 274-1: A logging bypass was discovered in the MySQL query parser. A local attacker could exploit this by inserting NUL characters into query strings (even into comments), which would cause the query to be logged incompletely.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/45892/USN-274-1.txt
Source: https://packetstormsecurity.com/files/45892/Ubuntu-Security-Notice-274-1.html