user/view.php in Moodle 1.8.x before 1.8.12 and 1.9.x before 1.9.8 does not properly check a role, which allows remote authenticated users to obtain the full names of other users via the course profile page.
http://www.vupen.com/english/advisories/2010/1107
http://lists.opensuse.org/opensuse-security-announce/2010-05/msg00001.html
http://cvs.moodle.org/moodle/user/view.php?r1=1.168.2.28&r2=1.168.2.29