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July 03, 2008
Microsoft trumpets security additions in upcoming IE8
Microsoft Corp. today outlined new security features that it plans to add to Internet Explorer (IE) next month, including anti-malware protection to match tools similar to those offered by its rivals and a filter the company said would block most cross-site scripting attacks.
Internet Explorer 8 Beta 2, which Microsoft has slated for release sometime in August, will include two new security tools, said Austin Wilson, the director of Windows client product management.
One, dubbed "SmartScreen Filter" by Microsoft, adds malware blocking to the antiphishing protection already embedded in IE7. The new feature, which will resemble the defenses already used by rival browsers Firefox 3.0 and Opera 9.5, will warn users when they're about to visit a site known or suspected of spreading malicious code and then block any download from that site.
Unlike Mozilla Corp.'s Firefox, which retrieves a blacklist several times daily, then stores it locally to compare against Web site addresses, IE8 will dynamically determine whether a site is potentially dangerous by pinging remote servers each time a user tries to reach a page.
Microsoft will use multiple third-party sources to compose the blacklists for both phishing and malware-hosting sites, said Wilson. It will also draw on data gathered by Windows Defender, the company's free antispyware tool. Wilson would not disclose the third-party information providers, however.
"We get the data feeds and update our lists multiple times a day," he said. "And IE8 makes the call to the URL reputation service servers, and if it's a phishing or malware site, the browser navigates away from the page and displays a warning."
He denied that the process would have a noticeable effect on IE8's performance. "Our choice was to make sure that the user has the most recent data possible," he said. "We do an asynchronous call, so the page rendering takes place while the call is made to the reputation servers."
Also to debut next month in IE8 Beta 2 is an integrated filter that Microsoft said would prevent most cross-site scripting attacks. "Today, the end user can be doing all the right things, checking the URL to make sure it's legitimate, only going to trusted sites, but because of vulnerabilities on the Web server side, they can still be compromised," said Wilson, referring to cross-site scripting attacks, which are most commonly used by identity thieves and have been on the upswing.
"When IE8 sees a cross-site scripting attack, it stops that script from being reflected to the server, and stops the attack at the client," Wilson added.
IE8 will have the cross-site scripting filter enabled by default, and it will not need to deal with pop-up warnings or other dialogs, added David Ross, a security software engineer at Microsoft. "When the filter discovers likely XSS in a cross-site request, it identifies and neuters the attack if it is replayed in the server's response," said Ross in a technical posting to the IE team's blog today.
Cross-site scripting is sometimes referred to by the abbreviation "XSS."
However, Ross acknowledged that IE8's cross-site scripting filter won't completely protect users. "The XSS Filter defends against the most common XSS attacks but it is not, and will never be, an XSS panacea," Ross said.
John Pescatore, a Gartner Inc. analyst, applauded Microsoft's plans. "It's good to see these kinds of things built into the browser," he said, adding that the two new features take different approaches against security problems on the Web.
The SmartScreen Filter is the "more reactive part" of the IE8 security upgrade, Pescatore argued. "You really have to protect the browser user against himself," he said, and one way is to block users from straying into dangerous places.
The concept behind the cross-site scripting filter and IE8's planned support for protocols designed to make intersite communications more secure is similar to the tools Microsoft and Hewlett-Packard Co. unveiled last week to help Web site developers and administrators secure their sites against SQL injection attacks. "You can't build everything into the browser," Pescatore said. "The browser has to be the thing that tries to protect the user, but it can't make up for all the Web security vulnerabilities."
IE8 Beta 2 will ship next month, Microsoft's Wilson confirmed today, although he declined to set a more specific date.
Beta 1, which launched four months ago, can be downloaded from Microsoft's Web site.
Source: ComputerWorld
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