Provide references for CVE-2011-4586.
Where can I find more information about CVE-2011-4586?
References are available at: https://bugzilla.redhat.com/show_bug.cgi?id=761248, http://git.moodle.org/gw?p=moodle.git%3Ba=commit%3Bh=581e8dba387f090d89382115fd850d8b44351526, http://www.debian.org/security/2012/dsa-2421, http://moodle.org/mod/forum/discuss.php?d=191754.