Ubuntu Security Notice 904-1 – It was discovered that Squid incorrectly handled certain malformed packets received on the HTCP port. A remote attacker could exploit this with a specially-crafted packet and cause Squid to crash, resulting in a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/86680/USN-904-1.txt
Source: https://packetstormsecurity.com/files/86680/Ubuntu-Security-Notice-904-1.html