Wednesday, April 4, 2007 
SEATTLE - Microsoft Corp. released an emergency security patch 
Tuesday to plug a hole in several versions of Windows - including 
Vista, which the software maker has touted as its most secure 
operating system ever.

Microsoft was so worried about the hole - which allowed hackers to 
break into personal computers and install malicious software - that 
it pushed out the critical security fix a week ahead of a regularly 
scheduled update.

The Redmond-based software company told customers last Thursday about 
a vulnerability in ".ani" files, which are used to change the cursor 
into an hourglass while a program works, or into a dancing animal or 
other animation on specially designed Web sites. Security experts 
said the hole was actively being exploited by hackers to install 
keystroke-logging programs.

Ken Dunham, director of the rapid response team at iDefense, the 
research division of VeriSign Inc., said a group of Chinese hackers 
was using the security hole to steal and sell log-ins to the 
popular "World of Warcraft" multiplayer computer game.

Microsoft said it has known about the vulnerability since December.

Users surfing the Web were the first targets, security experts said.

The Microsoft patch "will be a significant milestone in this attack," 
Dunham said. However, as businesses take time to test and implement 
the patch, and consumers delay downloading it, hackers will still be 
at work.

Customers whose Windows computers aren't set to automatically install 
critical patches can download the security update, MS07-017, from 
Microsoft's Web site.





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