Munin before 2.0.6 stores plugin state files that run as root in the same group-writable directory as non-root plugins, which allows local users to execute arbitrary code by replacing a state file, as demonstrated using the smart_ plugin.
http://www.ubuntu.com/usn/USN-1622-1
http://www.securityfocus.com/bid/55698
http://www.openwall.com/lists/oss-security/2012/08/21/1
http://lists.fedoraproject.org/pipermail/package-announce/2012-September/088260.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-September/088239.html
http://lists.fedoraproject.org/pipermail/package-announce/2012-September/086375.html