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Until Apple fixes QuickTime’s serious security vulnerability I would recommend that users do the following:
Another step you can take that is less effective is to go to the “Edit” menu in the QuickTime player choose “Preferences”, then “Player preferences”, and then uncheck “Automatically play movies when opened”. The result of this will be that when you open a movie on your computer it will load, but not start playing until you hit the play button. If you downloaded a hostile .MOV file (movie) this will give you one last chance to think again before you play it!
Hopefully Apple will fix the problem by providing users with proper control of their application. Consenting to play a movie should never have be the same as consenting to have other applications run in this manner.
Director of Technical Education
Author ESET Research, ESET