Apple has posted a Security Update labelled 2007-001. It is described as below:
Security Update 2007-001 is recommended for all users and improves the security of the following components:
QuickTime
For detailed information on this update, please visit this website: http://docs.info.apple.com/article.html?artnum=61798
The update weights 5.9MB and is available either through the Software Update utility or through Apple's support web site.

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