Microsoft patches critical Windows drive-by bug

Also repairs 'DLL load hijacking' flaw in Vista, but leaves several vulnerabilities unfixed

Microsoft today patched three vulnerabilities in Windows, one that could be exploited by attackers who dupe users into visiting a malicious Web site.

The company also debuted a new defensive measure to help users ward off ongoing attacks that are exploiting a known bug in Internet Explorer (IE).

The light load -- just two security updates, or "bulletins" as Microsoft calls them -- was announced last week , making for an easier beginning to the new year than the end of 2010, when in December the company shipped a record 17 updates that patched a near-record 40 bugs.

One of today's updates was classified as "critical" by Microsoft, the firm's top threat ranking, while the other was marked as "important," the second-most dangerous rating.

MS11-002 was the update that security researchers and Microsoft recommended users apply first. The update patched two vulnerabilities, one critical, the other important.

"Attackers can exploit the critical vulnerability in MS11-002 by getting users to browse to a malicious Web site," said Amol Sarwate, manager of Qualys' vulnerabilities research labs. The tactic, usually called a "drive-by" attack, relies on enticing users to click a link that's offered in a baited e-mail.

"It's exploitable through a drive-by," confirmed Sarwate.

The bug is in the Microsoft Data Access Components (MDAC), a set of components that lets Windows access databases such as Microsoft's own SQL Server. The flaw is in the MDAC ActiveX control that allows users to access databases from within IE.

Only users running IE are at risk from attacks exploiting the critical bug Microsoft disclosed in MS11-002, said both Sarwate and Andrew Storms, the director of security operations at nCircle Security.

Microsoft also urged customers to apply MS11-002 first, noting that all client versions of Windows, including XP Service Pack 3 (SP3), Vista and Windows 7 were vulnerable. The server editions of the operating system are vulnerable as well, but for them Microsoft rated the threat as important, not critical.

Hackers will probably come up with reliable attack code to exploit the bugs patched by MS11-002 in the next 30 days.

The other update, dubbed MS11-001 , is less important, said Sarwate and Storms, because it applies only to Windows Vista.

The Backup Manager bug is one of several so-called "DLL load hijacking" or "binary planting" vulnerabilities in Windows.

Today's fix for Vista was the seventh update Microsoft's released to repair flaws that researchers disclosed last August . Microsoft shipped five DLL load hijacking updates last month, and one in November.

In December, Microsoft said that the month's five updates were the last DLL load hijacking bugs it knew about. "This fixes all of the [Windows] components that we're aware of," said Jerry Bryant, a group manager with the Microsoft Security Response Center (MSRC), in an interview Dec. 14. He left the door open to more, however. "We're not closing that [DLL load hijacking] advisory just yet, and will continue to investigate."

Last month, researchers were skeptical that users were seeing the end of Microsoft's DLL load hijacking problems.

Today, Wolfgang Kandek, chief technology officer of Qualys, a California-based security risk and compliance management provider, said to figure on more from Microsoft. "We can expect a pretty constant stream, I think," said Kandek.

Also on Tuesday, Microsoft offered users an application "shim" that blocks in-the-wild attacks against IE that exploit a bug first disclosed last month.

Microsoft left several bugs unpatched today. In the last several weeks, the company has acknowledged a critical flaw in IE and serious vulnerabilities in Windows XP, Vista, Server 2003 and Server 2008, and confirmed reports that Chinese hackers were scouring the Web for information on another IE flaw.

The latter vulnerability was submitted to Microsoft last summer by Google security engineer Michal Zalewski. Microsoft and Zalewski have traded barbs over the timeline of his bug report, and subsequent release of a "fuzzer" tool that found the flaw.

Today's security patches can be downloaded and installed via the Microsoft Update and Windows Update services, as well as through Windows Server Update Services.

Join the newsletter!

Error: Please check your email address.
Rocket to Success - Your 10 Tips for Smarter ERP System Selection

Tags securityMicrosoftoperating systemssoftwareWindows

Keep up with the latest tech news, reviews and previews by subscribing to the Good Gear Guide newsletter.

Gregg Keizer

Computerworld (US)
Show Comments

Cool Tech

SanDisk MicroSDXC™ for Nintendo® Switch™

Learn more >

Breitling Superocean Heritage Chronographe 44

Learn more >

Toys for Boys

Family Friendly

Panasonic 4K UHD Blu-Ray Player and Full HD Recorder with Netflix - UBT1GL-K

Learn more >

Stocking Stuffer

Razer DeathAdder Expert Ergonomic Gaming Mouse

Learn more >

Christmas Gift Guide

Click for more ›

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

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.

Ratchada Dunn

Sharp PN-40TC1 Huddle Board

The Huddle Board’s built in program; Sharp Touch Viewing software allows us to easily manipulate and edit our documents (jpegs and PDFs) all at the same time on the dashboard.

George Khoury

Sharp PN-40TC1 Huddle Board

The biggest perks for me would be that it comes with easy to use and comprehensive programs that make the collaboration process a whole lot more intuitive and organic

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?