First exploit appears for Patch Tuesday vulnerability

Security researcher spells out JavaScript code that crashes IE 6 on Windows 2000 and XP2

A security researcher has published the first exploit against one of the 14 vulnerabilities patched last week by Microsoft, security company Symantec has warned customers.

In a posting to the Full Disclosures security mailing list, Alla Bezroutchko, a senior security engineer at Brussels-based Scanit NV/SA, spelled out JavaScript code that crashes Internet Explorer 6.0 on Windows 2000 and Windows XP Service Pack 2. Bezroutchko's proof of concept exploits the critical bug in XML Core Services that was patched by MS07-042.

That update, one of six rated "critical" by Microsoft, affected every currently supported version of Windows, including the new Vista operating system. An analyst last week pegged MS07-042 as one that should be deployed immediately. "MS07-042 affects everything," said Don Leatham, director of solutions and strategies at PatchLink. "There's so much going on with XML in enterprises. That's why this is so dangerous."

Symantec warned users of its DeepSight threat-alert network to expect Bezroutchko's crude exploit to be polished soon. "The current proof of concept will crash Internet Explorer; however, it is likely that this code will be modified to produce a code-execution exploit in the near future," read the Symantec warning.

It has become common for exploits to appear within days, if not hours, of Microsoft releasing its security updates, to the point that the practice even has a nickname: Exploit Wednesday.

According to other research, however, Exploit Wednesday is part myth. Hackers don't actually stockpile attack code and synchronize the release with the appearance of patches, Craig Schmugar, a security researcher at McAfee Inc., said in June when he released the results of a survey of 200 zero-day Windows vulnerabilities.

"I don't see Exploit Wednesday as a strategically timed release but that it comes about simply because more information is being made available," Schmugar said.

Join the newsletter!

Or
Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection
Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Gregg Keizer

Computerworld
Show Comments

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Andrew Teoh

Brother MFC-L9570CDW Multifunction Printer

Touch screen visibility and operation was great and easy to navigate. Each menu and sub-menu was in an understandable order and category

Louise Coady

Brother MFC-L9570CDW Multifunction Printer

The printer was convenient, produced clear and vibrant images and was very easy to use

Edwina Hargreaves

WD My Cloud Home

I would recommend this device for families and small businesses who want one safe place to store all their important digital content and a way to easily share it with friends, family, business partners, or customers.

Walid Mikhael

Brother QL-820NWB Professional Label Printer

It’s easy to set up, it’s compact and quiet when printing and to top if off, the print quality is excellent. This is hands down the best printer I’ve used for printing labels.

Ben Ramsden

Sharp PN-40TC1 Huddle Board

Brainstorming, innovation, problem solving, and negotiation have all become much more productive and valuable if people can easily collaborate in real time with minimal friction.

Sarah Ieroianni

Brother QL-820NWB Professional Label Printer

The print quality also does not disappoint, it’s clear, bold, doesn’t smudge and the text is perfectly sized.

Featured Content

Product Launch Showcase

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?