Microsoft Corp. has taken the rare step of warning about a serious computer security vulnerability it hasn’t fixed yet, reports the Associated Press. The vulnerability disclosed July 6 affects Internet Explorer users whose computers run the Windows XP or Windows Server 2003 operating software. It can allow hackers to remotely take control of victims’ machines. The victims don’t need to do anything to get infected except visit a web site that’s been hacked. Security experts say criminals have been attacking the vulnerability for nearly a week. Thousands of sites have been hacked to serve up malicious software that exploits the vulnerability. People are drawn to these sites by clicking a link in spam eMail. The vulnerability disclosed by Microsoft affects a part of its software used to play video. The problem arises from the way the software interacts with Internet Explorer, which opens a hole for hackers to tunnel into. Microsoft urged vulnerable users to disable the problematic part of its software, which can be done from Microsoft’s web site (http://support.microsoft.com/kb/972890#FixItForMe), while the company works on a fix for the problem…

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