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Microsoft releases WMF patch early

The software giant released a patch for the much-exploited flaw at 4 p.m. ET Thursday. Additional security updates are scheduled for next week.

Microsoft handed IT administrators a surprise late Thursday -- the much-anticipated patch for a Windows Meta File (WMF) glitch that has already been the target of numerous exploits. The company released the fix at 4 p.m. ET in security bulletin MS06-001.

The Redmond, Wash.-based software giant made the announcement on its TechNet site, in a message otherwise intended as a heads-up on what to expect this coming Patch Tuesday.

More on the WMF flaw

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Microsoft plans WMF fix next week

New WMF worm in wild; unofficial fixes circulating

Windows image flaw now 'extremely critical'

"Microsoft originally planned to release the update Tuesday, Jan. 10, 2006 as part of its regular monthly release of security bulletins once testing for quality and application compatibility was complete," the company said. "However, testing has been completed earlier than anticipated and the update is ready for release. In addition, Microsoft is releasing the update early in response to strong customer sentiment that the release should be made available as soon as possible."

The software giant stressed that its monitoring of attack data "continues to indicate that the attacks are limited and are being mitigated both by Microsoft's efforts to shut down malicious Web sites and with up-to-date signatures from antivirus companies."

The patch being released Thursday fixes a design flaw in how Windows handles its image files.

Originally designed to assist when a print job needed to be canceled during spooling, the function has been rigged by malicious coders to compromise machines running Windows XP (including those with the SP 2 patch installed), ME, 2000 and Windows Server 2003 by hiding malicious code on a Web page or e-mail containing .WMF files. Vendors reported last week that the flaw is primarily being used to sneak spyware onto computers.

As for Patch Tuesday, Microsoft said customers can expect two security bulletins for critical vulnerabilities in Windows, Exchange and Office. Users will have to wait until then to learn what the specific flaws are. And while it doesn't expect any more scheduling changes, the company said, "the number of bulletins, products affected, restart information and severities are subject to change until released."

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