Overview: Apple has released Security Update 2008-008 and Mac OS X version 10.5.6 to correct multiple vulnerabilities affecting Apple Mac OS X and Mac OS X Server. These vulnerabilities could allow an attacker to gain access to crash your computer or access your data without your approval.
Solution: Install Apple Security Update 2008-008 or Apple Mac OS X version 10.5.6. These and other updates are available via Software Update or via Apple Downloads.
Apple Security Update 2008-008
US-CERT Technical Alerts