Microsoft talks up countermeasures to fend off IE attacks

Recommends several moves, with no word on when a patch will be ready

Microsoft warned users of Internet Explorer 7 (IE7) late Wednesday that attackers are actively exploiting a critical bug in the browser, and urged them to take countermeasures in lieu of a patch.

In a late-Wednesday security advisory, Microsoft officially acknowledged the flaw. "We are aware only of limited attacks that attempt to use this vulnerability," the company said, adding that users running IE7 in Windows XP, Windows Vista, Windows Server 2008 and Windows Server 2008 are at risk.

As is its practice, however, the company was vague about whether it would patch the problem, and if so, when. "On completion of this investigation, Microsoft will take the appropriate action to protect our customers, which may include providing a solution through a service pack, our monthly security update release process, or an out-of-cycle security update, depending on customer needs."

The last time that Microsoft went off its usual once-a-month security update schedule was in late October, when it issued an emergency patch for a bug in Windows that was also being exploited in the wild.

In one way, Microsoft downplayed the threat posed by the IE7 bug, which independent researchers have said is in a browser rendering component , and is triggered by misuse of the HTML "span" tag.

"Our investigation of these attacks so far has verified that they are not successful against customers who have applied the workarounds listed in this advisory," Microsoft said. "Additionally, there are mitigations that increase the difficulty of exploiting this vulnerability."

The company spelled out three things IE7 users can do to protect themselves:

Set "Internet" and "Local internet" security zones to "high." To do that, users must select "Internet Options" from the Tools menu, click the Security tab, click on "Internet," then move the slider to the "High" setting. Repeat for "Local intranet." Click OK.

Disable Active Scripting. Choose "Internet Options" from the Tools menu, click the Security tab, click the "Internet" icon and then the "Custom level" button. In the ensuing dialog, under the "Scripting" section, in the "Active scripting" item, click "Disable," then OK.

Enable DEP (data execution prevention). Select "Internet Options" from the Tools menu, click the Advanced tab, then check "Enable memory protection to help mitigate online attacks." Click OK.

Although multiple exploits have surfaced, all are effective against only IE7. Researchers, including those at Microsoft, are still investigating whether the older IE6 also contains the same vulnerability.

"The information posted in Microsoft's security advisory is what the company knows to be true at this time, [but] Microsoft continues to investigate this vulnerability," a company spokesman replied in an e-mail when asked whether Microsoft had found a similar bug in IE6. "If Microsoft can confirm new information based on its ongoing investigation, it will update the security advisory as necessary."

Join the newsletter!

Or

Sign up to gain exclusive access to email subscriptions, event invitations, competitions, giveaways, and much more.

Membership is free, and your security and privacy remain protected. View our privacy policy before signing up.

Error: Please check your email address.

Tags Internet Explorer

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

Gregg Keizer

Computerworld
Show Comments

Father’s Day Gift Guide

Brand Post

Most Popular Reviews

Latest Articles

Resources

PCW Evaluation Team

Luke Hill

MSI GT75 TITAN

I need power and lots of it. As a Front End Web developer anything less just won’t cut it which is why the MSI GT75 is an outstanding laptop for me. It’s a sleek and futuristic looking, high quality, beast that has a touch of sci-fi flare about it.

Emily Tyson

MSI GE63 Raider

If you’re looking to invest in your next work horse laptop for work or home use, you can’t go wrong with the MSI GE63.

Laura Johnston

MSI GS65 Stealth Thin

If you can afford the price tag, it is well worth the money. It out performs any other laptop I have tried for gaming, and the transportable design and incredible display also make it ideal for work.

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.

Featured Content

Product Launch Showcase

Don’t have an account? Sign up here

Don't have an account? Sign up now

Forgot password?