Secunia Security Advisory – Ubuntu has issued an update for Ruby. This fixes some vulnerabilities, which can be exploited by malicious people to conduct spoofing attacks or to cause a DoS (Denial of Service).
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/79499/sa35937.txt
Source: https://packetstormsecurity.com/files/79499/Secunia-Security-Advisory-35937.html