Several protective updates are available for Windows, IE, Word, Exchange, and other products.

Many of these are rated as Critical and users should promptly update their systems.

Microsoft – December 2012 Security Update home page http://technet.microsoft.com/en-us/security/bulletin/ms12-dec

ISC – EXCELLENT COMPLEMENTARY ANALYSIS https://isc.sans.edu/diary/Microsoft+December+2012+Black+Tuesday+Update+-+Overview/14683