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Internet Explorer File Download Extension Spoofing
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Secunia Advisory:
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SA10736
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Release Date:
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2004-01-28
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Last Update:
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2004-08-20
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Critical:
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Moderately critical
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Impact:
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Security Bypass
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Microsoft Internet Explorer 6.x
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Description:
http-equiv has identified a vulnerability in Internet Explorer, allowing malicious web sites to spoof the file extension of downloadable files.
The problem is that Internet Explorer can be tricked into opening a file, with a different application than indicated by the file extension. This can be done by embedding a CLSID in the file name. This could be exploited to trick users into opening "trusted" file types which are in fact malicious files.
Secunia has created an online test:
http://secunia.com/Internet_Explorer_File_Download_Extension_Spoofing_Test/
This has been reported to affect Microsoft Internet Explorer 6.
NOTE: Prior versions may also be affected.
Do you have this product installed on your home computer? Scan using the free Personal Software Inspector. Check if a vulnerable version is installed on computers in your corporate network, using the Network Software Inspector.
Solution:
The vulnerability has been fixed silently in some cumulative security update.
Provided and/or discovered by:
http-equiv
Changelog:
2004-08-20: Updated "Solution" section.
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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