This indicates an attack attempt against format string vulnerability in Apple iChat.
The vulnerability is caused by an error when handling an "aim://" URI with a specially crafted argument, which could be exploited by attackers to crash a vulnerable application or potentially compromise an affected system by enticing users into visiting a specially crafted web page.
Apple Mac OS X version 10.3.9 and prior.
Apple Mac OS X Server version 10.3.9 and prior.
Apple Mac OS X version 10.4.8 and prior.
Apple Mac OS X Server version 10.4.8 and prior.
System Compromise: Remote attackers can gain control of vulnerable systems.
Denial of Service: Remote attackers can crash vulnerable systems.
Apply patch, available from the web site:
Security Update 2007-002 (Universal):
Security Update 2007-002 (PPC):
Security Update 2007-002 (Panther):