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 PC World newsletter!

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

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Matthew Stivala

HP OfficeJet 250 Mobile Printer

The HP OfficeJet 250 Mobile Printer is a great device that fits perfectly into my fast paced and mobile lifestyle. My first impression of the printer itself was how incredibly compact and sleek the device was.

Armand Abogado

HP OfficeJet 250 Mobile Printer

Wireless printing from my iPhone was also a handy feature, the whole experience was quick and seamless with no setup requirements - accessed through the default iOS printing menu options.

Azadeh Williams

HP OfficeJet Pro 8730

A smarter way to print for busy small business owners, combining speedy printing with scanning and copying, making it easier to produce high quality documents and images at a touch of a button.

Andrew Grant

HP OfficeJet Pro 8730

I've had a multifunction printer in the office going on 10 years now. It was a neat bit of kit back in the day -- print, copy, scan, fax -- when printing over WiFi felt a bit like magic. It’s seen better days though and an upgrade’s well overdue. This HP OfficeJet Pro 8730 looks like it ticks all the same boxes: print, copy, scan, and fax. (Really? Does anyone fax anything any more? I guess it's good to know the facility’s there, just in case.) Printing over WiFi is more-or- less standard these days.

Ed Dawson

HP OfficeJet Pro 8730

As a freelance writer who is always on the go, I like my technology to be both efficient and effective so I can do my job well. The HP OfficeJet Pro 8730 Inkjet Printer ticks all the boxes in terms of form factor, performance and user interface.

Michael Hargreaves

Windows 10 for Business / Dell XPS 13

I’d happily recommend this touchscreen laptop and Windows 10 as a great way to get serious work done at a desk or on the road.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?