Secunia Security Advisory – Gentoo has issued an update for libarchive (formerly bsdtar). This fixes some vulnerabilities, which can be exploited by malicious people to cause a DoS (Denial of Service) or potentially compromise a vulnerable system.
You can download this advisory from the following link: https://packetstormsecurity.com/files/download/58410/sa26355.txt
Source: https://packetstormsecurity.com/files/58410/Secunia-Security-Advisory-26355.html