Launch Services in Apple Mac OS X 10.6.x before 10.6.2 recursively clears quarantine information upon opening a quarantined folder, which allows user-assisted remote attackers to execute arbitrary code via a quarantined application that does not trigger a "potentially unsafe" warning message.
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