Secunia Security Advisory – Ubuntu has issued an update for ruby. This fixes some vulnerabilities, which can be exploited by malicious people to bypass certain security restrictions.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/48676/sa21233.txt
Source: https://packetstormsecurity.com/files/48676/Secunia-Security-Advisory-21233.html