In keeping with its normal schedule, Microsoft today released its monthly bundle of security bulletins, and the associated patches, for March. This month, there are three patches addressing four identified vulnerabilities. Two of these patches are for Windows components; the other is for a component of Microsoft Office called Groove. One of the Windows patches has a Critical severity rating; the other patches are rated Important. Microsoft also says that exploit code is Likely for all of these vulnerabilities; three of the four have been publicly disclosed.
Further details and download links are in the Security Bulletin Summary for March. Any of these patches may require a system restart. As always, you should update your systems as son as you conveniently can.
As usual, the folks at the SANS Internet Storm Center have published their own summary of the patches, together with their severity ratings.