Third Word exploit released

Hackers have published attack code exploiting an the third Microsoft Word flaw to reported in the past week

Hackers have released attack code that exploits a critical vulnerability in Microsoft's Word software -- the third such bug to be disclosed in the past week.

The proof of concept code was posted Tuesday on the Milw0rm.com Web site, making it widely available to the hacking community. It exploits a previously unreported bug in Word.

Like the other recent Word bugs disclosed this past week, it could be used by attackers to run unauthorized software on a victim's computer, said David Marcus, security research and communications manager with McAfee's Avert Labs

Attackers have been using these Word exploits in extremely targeted attacks, where a small number of victims are sent an e-mail with a maliciously encoded Word document attached. The hackers use social engineering techniques to try to trick the victim into opening the dangerous attachment.

For example, in a recent Word attack, first reported Sunday, the malicious e-mail "was sent to a very high-profile company, directly to three people at the company," Marcus said.

Microsoft is investigating reports of this latest Word bug, a spokesman for the company's public relations agency said.

Though they are not being widely exploited, the unpatched Word vulnerabilities are causing some enterprises concern.

At the Port of Seattle, for example, users are being cautioned and e-mail with Word attachments is getting a little more scrutiny, said Ernie Hayden, chief information security manager with the port. "We've done some blocking on our e-mail, and we've had dialogue with people with respect to what our expectations are," he said.

Attacks on Microsoft's Office software have been on the rise for months now, said Marc Maiffret, chief technology officer with security vendor eEye Digital Security Inc. Office vulnerabilities were once released "on a monthly basis," he said. "Now we're at the point were it's almost daily."

Still, publishing attack code ultimately works contrary to the interests of the bad guys, he added. "It's kind of disruptive, and it creates a panic," he said. "But all it does is make the industry focus and come up with a resolution."

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