Ubuntu Security Notice USN-692-1 – It was discovered that the Gadu library, used by some Instant Messaging clients, did not correctly verify certain packet sizes from the server. If a user connected to a malicious server, clients using Gadu could be made to crash, leading to a denial of service.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/73169/USN-692-1.txt
Source: https://packetstormsecurity.com/files/73169/Ubuntu-Security-Notice-692-1.html