Microsoft hustles on IE patch, tests fix

Doesn't commit to rush delivery; offers tool to disable buggy file

Microsoft yesterday said it is testing a patch for a critical vulnerability in Internet Explorer (IE), but stopped short of promising to deliver an emergency fix before the next scheduled Patch Tuesday.

"We have seen speculation that Microsoft might release an update for this issue out-of-band," said Jerry Bryant, a senior manager with the Microsoft Security Response Center (MSRC), referring to the term the company uses for a rush fix. "I can tell you that we are working hard to produce an update which is now in testing."

Microsoft first warned users of the vulnerability in IE6 and IE7 last Tuesday when it said hackers were exploiting the bug. The next day, Israeli security researcher Moshe Ben Abu grabbed the attack code from a site that had been using it to conduct "drive-by" attacks, then crafted a public exploit , which he published to the popular Metasploit penetration testing framework.

Even before Abu posted his exploit, security experts had said they expected Microsoft to ship an out-of-band update if attack code went public.

Bryant, however, did not commit Microsoft to an emergency patch, saying only, "We never rule out the possibility of an out-of-band update," in an entry on the MSRC blog Friday. Testing, he added, was a "critical and time intensive" part of the process because Microsoft had to confirm the update worked with all versions of both IE and Windows. Only IE6 and IE7 harbor the bug; the oldest and the newest editions, IE 5.01 and IE8 respectively, do not.

Also yesterday, Microsoft offered an automated "Fix it" tool to disable the component in the "iepeers.dll" file that contains the vulnerability . The free tool works on machines powered by Windows XP or Windows Server 2003. That workaround was an addition to those that Microsoft recommended last Tuesday, which included disabling scripting, enabling DEP (data execution prevention) and upgrading to IE8 .

Rival browsers, including Mozilla's Firefox, Google 's Chrome and Opera Software's Opera, are also safe from the in-the-wild attacks aimed at IE6 and IE7.

The newest zero-day is the second this year that Microsoft has admitted hackers have exploited before a patch was ready. In mid-January, Microsoft said that a flaw in IE had been used to attack several companies' networks , including Google's and Adobe's. Microsoft patched the vulnerability on Jan. 21 in an out-of-band update.

Microsoft's next scheduled Patch Tuesday is April 13, more than four weeks away.

Gregg Keizer covers Microsoft, security issues, Apple, Web browsers and general technology breaking news for Computerworld. Follow Gregg on Twitter at @gkeizer or subscribe to Gregg's RSS feed . His e-mail address is gkeizer@ix.netcom.com .

Read more about security in Computerworld's Security Knowledge Center.

Join the newsletter!

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

Tags exploits and vulnerabilitiesMicrosoftInternet Explorer

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

Gregg Keizer

Computerworld (US)
Show Comments

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

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

David Coyle

Brother PocketJet PJ-773 A4 Portable Thermal Printer

I rate the printer as a 5 out of 5 stars as it has been able to fit seamlessly into my busy and mobile lifestyle.

Kurt Hegetschweiler

Brother PocketJet PJ-773 A4 Portable Thermal Printer

It’s perfect for mobile workers. Just take it out — it’s small enough to sit anywhere — turn it on, load a sheet of paper, and start printing.

Featured Content

Latest Jobs

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?