Apple has released Security Update 2010-003 (Leopard-Client) to address a critical vulnerability in the way Apple Type Services in Mac OS X 10.6 Snow Leopard parses embedded fonts. Users who view or download any documents containing maliciously crafted embedded fonts run a risk of arbitrary code execution. The update addresses this issue by improving index checking. This vulnerability was first demonstrated by Charlie Miller at the Pwn2Own conference 20 days ago, which shows a reasonably quick response on Apple's part. A nearly identical update - Security Update 2010-003 (Leopard-Server) - that eliminates the same vulnerability is available for Leopard Server. The update requires you are running Mac OS X 10.5.8 and is available via Software Update and the Apple Support Downloads page. (Free, 218.6/379.5 MB)
Enter Dashboard, Expose, or Spaces Temporarily
Hold down F9, F10, F11, or F12 (or whatever you've set for the Expose and Spaces keyboard shortcuts) for a few seconds, and then release the key to enter and leave the appropriate mode without having to press the key again. This is particularly useful for Dashboard, in which you can check the contents of a widget and then return to your work with only a single key press.
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Security Update 2010-003 (Leopard)
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