Secunia Security Advisory – Ubuntu has issued an update for ruby. This fixes some security issues, which can be exploited by malicious people to conduct spoofing attacks.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/64971/sa29556.txt
Source: https://packetstormsecurity.com/files/64971/Secunia-Security-Advisory-29556.html