Launch Services in Apple Mac OS X before 10.5, when Open Safe Files is enabled, allows remote attackers to execute arbitrary code via a symlink attack, probably related to a race condition and automatic execution of a downloaded file.
http://lists.apple.com/archives/security-announce/2008//Jun/msg00002.html
http://secunia.com/advisories/30802
http://securitytracker.com/id?1020393
http://support.apple.com/kb/HT2163
http://www.securityfocus.com/bid/30018
http://www.vupen.com/english/advisories/2008/1981/references