Ubuntu Security Notice USN-808-1 – Micha Krause discovered that Bind did not correctly validate certain dynamic DNS update packets. An unauthenticated remote attacker could send specially crafted traffic to crash the DNS server, leading to a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/79782/USN-808-1.txt
Source: https://packetstormsecurity.com/files/79782/Ubuntu-Security-Notice-808-1.html