The Apple QuickTime zero-day exploits are also targeting systems running Apple Safari 3.0 on Windows, Firefox, and Microsoft's Vista, XP, Internet Explorer 6, and IE7, .
SANS also reminded people to undo the workarounds once Apple develops a patch for the security problem. Otherwise, the QuickTime streams won't work on your system.
Security researchers are warning that exploit code has been published that can take advantage of an extremely critical security flaw in a protocol supported by Apple QuickTime.
And because Apple's iTunes contains a component of QuickTime, installations of iTunes are also at risk, according to a security advisory by the United States Computer Emergency Readiness Team (US-CERT).
The security flaw is found in the Real Time Streaming Protocol (RTSP) supported by Apple's QuickTime Streaming Server and QuickTime player, US-CERT notes. As a result, users who load a malicious RTSP stream via a QuickTime Media Link file or by visiting a malicious Web page, may find their systems compromised. Malicious attackers, for example, could execute arbitrary code from users' systems or launch a denial-of-service attack.
Earlier this month, Apple released QuickTime 7.3 to address seven security flaws in QuickTime 7.2. The fixes, however, did not deal with the RTSP vulnerability cited by security researchers over the past three days.
Security firm Secunia has rated the vulnerability "extremely critical."