Apple has released an updated version of QuickTime (version 7.6.2) which fixes a number of security holes. If left unpatched the holes could be exploited by hackers who could create a booby-trapped movie or audio file, programmed to execute malicious code on computers. One of the bugs was partially revealed in a book, The Mac Hackers Handbook by Charlie Miller and Dino Dai Zovi, published in March. In addition to the QuickTime update, Apple has also released iTunes 8.2.”]
Source: https://grahamcluley.com/apple-plugs-security-holes-quicktime-itunes/