A vulnerability has been reported in Internet Explorer, which can be exploited by malicious people to compromise a user's system.
The vulnerability is caused due to a boundary error in the "CMimeFt::Start()" function within urlmon.dll when processing URLs on a website using HTTP 1.1 and compression. This can be exploited to cause a heap-based buffer overflow via an overly long URL (more than 260 bytes).
Successful exploitation allows execution of arbitrary code when a user is e.g. tricked into visiting a malicious website.
The vulnerability affects Internet Explorer 6 SP1 on Windows 2000 and Windows XP SP1 and was introduced by the MS06-042 patches.
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Subject: Internet Explorer URL Compression Buffer Overflow
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