mnet/lib.php in Moodle 1.8 before 1.8.11 and 1.9 before 1.9.7, when MNET services are enabled, does not properly check permissions, which allows remote authenticated servers to execute arbitrary MNET functions.
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00751.html
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00730.html
https://www.redhat.com/archives/fedora-package-announce/2009-December/msg00704.html
http://www.vupen.com/english/advisories/2009/3455
http://www.securityfocus.com/bid/37244
http://secunia.com/advisories/37614
http://moodle.org/mod/forum/discuss.php?d=139106
http://docs.moodle.org/en/Moodle_1.9.7_release_notes
http://docs.moodle.org/en/Moodle_1.8.11_release_notes
http://cvs.moodle.org/moodle/mnet/lib.php?r1=1.9.2.7&r2=1.9.2.8
http://cvs.moodle.org/moodle/mnet/lib.php?r1=1.16.2.10&r2=1.16.2.11