Ubuntu Security Notice USN-122-1 – Michael Bhola discovered that errors in the http_access configuration, in particular missing or invalid ACLs, did not cause a fatal error in Squid. This could lead to wider access permissions than intended by the administrator.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/39095/USN-122-1.txt
Source: https://packetstormsecurity.com/files/39095/Ubuntu-Security-Notice-122-1.html