CVE-2008-0041
Parental Controls in Apple Mac OS X 10.5 through 10.5.1 contacts www.apple.com "when a website is unblocked," which allows remote attackers to determine when a system is running Parental Controls.
Date published : 2008-02-12
http://lists.apple.com/archives/security-announce/2008/Feb/msg00002.html