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Who's to blame for browser bug? IE or Firefox?

By Robert McMillan , IDG News Service , 07/11/2007
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A security researcher has found a security bug that could be attacked in Internet Explorer. Mozilla said it plans to patch the problem in its next Firefox software update.

No, that's not a typo, just the strange fall-out from an unusual bug that had security researchers debating the question this week, "Who's to blame? Microsoft or Mozilla?"

Security researcher Thor Larholm kicked off the controversy on Tuesday, claiming that he had discovered a flaw that would let an attacker run commands on a victim's PC.

In his blog posting, Larholm said the bug was similar to a flaw he'd discovered last month in Apple's Safari 3.0 beta software, and he called it an an "input validation flaw in Internet Explorer." The problem is with a URL protocol handler component of IE, he said. This software allows IE users to launch applications such as Excel or Firefox by clicking on specially written links on Web pages.

When IE clicks on a link that launches the Firefox browser, however, the software does not properly check its syntax, and that, Larholm said, lets an attacker create a malicious link, that could be used in an attack. Security vendor Secunia ApS rates the flaw as "highly critical."

So while the flaw affects IE users, it appears to be a risk only to those who already have Firefox installed. And to make matters more complicated, if a Firefox user were to click on one of the specially-written links, he would not be affected.

Still, Microsoft Security Program Manager Mark Griesi said that the bug was not his company's problem. "We don't feel that there's an issue in IE and therefore there's nothing to be fixed," he said Tuesday.

With Microsoft saying it won't fix the vulnerability, Mozilla said it would change the way its Firefox URL protocol handler worked in its next Firefox update. That will fix Larholm's bug, but Mozilla security strategist Window Snyder wouldn't say whether or not she considered the vulnerability to be an IE or Firefox problem. She did, however, point out that without Microsoft making changes to IE, other Windows programs may be at risk.

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IMBy Anonymous on May 1, 2008, 12:40 amITS IT TO BLAME IT GIVES VIRUSES ON YOUR COMPUTER AND THAT HAPPNEDED TO ME BEFORE

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Meanwhile, Microsoft invests $50M in securityBy Micronet on July 12, 2007, 2:07 pmSee Microsoft Subnet for more Microsoft-related news, blogs, security alerts, technical group. Spending on advertising is ok. Spending on cooperating is a different...

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RE: Who's to blame for browser bug? IE or Firefox?By RAYMOND on July 11, 2007, 12:56 pmRead ASAP!

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