Secunia Security Advisory – Fedora has issued an update in rubygem-actionpack. This fixes a vulnerability, which can be exploited by malicious people to conduct HTTP header injection attacks.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/75335/sa34097.txt
Source: https://packetstormsecurity.com/files/75335/Secunia-Security-Advisory-34097.html