Event Monitor in Apple Mac OS X 10.5.8 does not properly handle crafted authentication data sent to an SSH daemon, which allows remote attackers to cause a denial of service via vectors involving processing of XML log documents by other services, related to a "log injection" issue.
http://www.vupen.com/english/advisories/2009/3184
http://www.securityfocus.com/bid/36956
http://support.apple.com/kb/HT3937
http://lists.apple.com/archives/security-announce/2009/Nov/msg00000.html