lib/setuplib.php in Moodle through 2.1.10, 2.2.x before 2.2.8, 2.3.x before 2.3.5, and 2.4.x before 2.4.2 allows remote attackers to obtain sensitive information via an invalid request, which reveals the absolute path in an exception message.
https://moodle.org/mod/forum/discuss.php?d=225342
http://openwall.com/lists/oss-security/2013/03/25/2
http://lists.fedoraproject.org/pipermail/package-announce/2013-April/101358.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-April/101310.html
http://git.moodle.org/gw?p=moodle.git&a=search&h=HEAD&st=commit&s=MDL-36901