Microsoft warns of a score of security holes

Microsoft released on Tuesday fixes that cover at least 20 Windows flaws, several of which could make versions of the operating system vulnerable to new worms or viruses.

At least six of the flaws could make the OS susceptible to programs similar to the MSBlast worm and its variants, which have infected more than 8 million computers since last August. Another flaw affects a common file used by Internet Explorer, Outlook and Outlook Express and opens the way for the type of virus that executes when PC users click a specially crafted Web link.

The software giant released four patches to cover the 20 security issues, as part of its monthly update schedule. Microsoft wouldn’t comment on the level of risk the flaws present, instead maintaining that companies that apply the fixes won’t be in danger.

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