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IE7/Firefox URI Bug Caused by Windows After All


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#1 Nvyseal

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Posted 30 July 2007 - 05:38 PM

images/news/ie.jpgAn exploitable bug discovered earlier this month that was first believed to have been caused by Internet Explorer 7.0, before Mozilla was forced to admit that it afflicted Firefox as well, has apparently been traced back to a Windows API function.

The discovery may have been first revealed through the US-CERT Web site of the Dept. of Homeland Security, which now classifies it as a "Microsoft Windows URI protocol handling vulnerability." The function in question is an old favorite of malware writers: ShellExecute(), which was the subject of a notorious Windows 2000 exploit four years ago.

The problem, as it now stands, seems to be this: After IE7 is installed on a system, or when a new operating system is installed with IE7 present, the ShellExecute() API function is handled differently. This is the call (or one of the calls) that a Windows application would place when it wishes to launch another application.

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