Secunia Security Advisory – Ubuntu has issued an update for libvorbis. This fixes some vulnerabilities, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially to compromise an application using the library.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/72556/sa32946.txt
Source: https://packetstormsecurity.com/files/72556/Secunia-Security-Advisory-32946.html