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Moderately critical

Internet Explorer URL Spoofing Vulnerability

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Release Date:  2003-12-09    Last Update:  2004-02-02    Views:  335,857

Secunia Advisory SA10395

Where:

From remote

Impact:

Spoofing

Solution Status:

Vendor Patch

CVE Reference(s):

Description


A vulnerability has been identified in Internet Explorer, which can be exploited by malicious people to display a fake URL in the address and status bars.

The vulnerability is caused due to an input validation error, which can be exploited by including the "%01" and "%00" URL encoded representations after the username and right before the "@" character in an URL.

Successful exploitation allows a malicious person to display an arbitrary FQDN (Fully Qualified Domain Name) in the address and status bars, which is different from the actual location of the page.

This can be exploited to trick users into divulging sensitive information or download and execute malware on their systems, because they trust the faked domain in the two bars.

Example displaying only "http://www.trusted_site.com" in the two bars when the real domain is "malicious_site.com":
http://www.trusted_site.com%01%00@malicious_site.com/malicious.html

A test is available at:
http://secunia.com/internet_explorer_address_bar_spoofing_test/

The vulnerability has been confirmed in version 6.0, and version 5.x is also affected according to Microsoft's knowledge base article.

NOTE: This vulnerability is currently being exploited on the Internet via scam emails!


Solution:
Apply patches manually or via WindowsUpdate.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Originally discovered by:
Zap The Dingbat

Status bar variant reported by:
Chris Hall

Original Advisory:
http://www.microsoft.com/technet/security/bulletin/MS04-004.asp

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Internet Explorer URL Spoofing Vulnerability

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RE: Internet Explorer URL Spoofing Vulnerability
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