Microsoft to release IE update for critical vulnerabilities on Friday

The company has decided to issue an out-of-band update for critical problems in Internet Explorer

Microsoft released a quick fix on Wednesday for a critical problem in its Internet Explorer browser and said a more permanent fix would be released on Friday.

The problem is particularly dangerous because it can be exploited by creating a malicious website that attacks visitors who use a vulnerable browser. Those browsers include IE6, IE7, IE8 and IE9. The only version not affected is IE10.

The one-click fix will protect computers immediately, wrote Yunsun Wee, director of Microsoft's Trustworthy Computing group. On Friday, Microsoft will diverge from its normal patch schedule and issue a "cumulative update" for IE through its Windows Update service.

The cumulative update is named MS12-063 and will be released around 10 a.m. Pacific Time on Friday. It will also address four other critical, remote code execution vulnerabilities, Wee wrote.

"We recommend that you install this update as soon as it is available," Wee wrote. "If you have automatic updates enabled on your PC, you won't need to take any action -- it will automatically be updated on your machine. This will not only reinforce the issue that the Fix It addressed, but cover other issues as well."

Microsoft will hold a live webcast at 12 p.m. Pacific Time on Friday to answer questions.

Microsoft normally issues patches on the second Tuesday of the month, but it issues an out-of-band update if a vulnerability is considered severe enough. The company said on Tuesday it had only seen a few attempts to exploit this vulnerability.

Security vendor AlienVault said it had discovered a second exploit using this IE vulnerability that installs a RAT (remote access tool) on victims' computers. The first exploit, found last weekend, installed a RAT called Poison Ivy.

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