Microsoft warns of Word attacks

30.12.2010
Hackers are exploiting a vulnerability in Microsoft Word to plant malware on Windows PCs, Microsoft said Tuesday.

The bug in Microsoft Word 2002, 2003, 2007 and 2010 was patched Nov. 9 as part of Microsoft's .

Word 2008 and 2011 for the Mac have also been patched, but Microsoft has not yet issued a fix for the same flaw in the older Word 2004. The circulating attacks affect only Windows versions of the suite, however.

According to the (MMPC), the group that investigates attack code and issues signature updates for the company's antivirus software, the first in-the-wild exploits were detected last week.

When Microsoft shipped the Word patch last month, it rated the bug as "1" on its exploitability index, meaning it believed a working attack would pop up within 30 days.

The attack uses a malicious RTF (Rich Text Format) file to generate a stack overflow in Word on Windows, said MMPC researcher Rodel Finones. Following a successful exploit, the attack code downloads and runs a Trojan horse on the compromised computer.