Ubuntu Security Notice USN-775-1 – It was discovered that the BGP service in Quagga did not correctly handle certain AS paths containing 4-byte ASNs. An authenticated remote attacker could exploit this flaw to cause bgpd to abort, leading to a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/77460/USN-775-1.txt
Source: https://packetstormsecurity.com/files/77460/Ubuntu-Security-Notice-775-1.html