Microsoft Internet Explorer vulnerable to address bar spoofing on double byte character set systems

Overview

Microsoft Internet Explorer contains a vulnerability in how it processes URLs on Double Byte Character Set (DBCS) systems. This could allow an attacker to spoof the address of a web site.

Description

Microsoft Internet Explorer contains a canonicalization error when it parses special characters in a URL on a DBCS system. A DBCS system represents characters with either a single byte or a double byte code. DBCS is used with some Asian versions of Microsoft Windows. Because of the error in how IE parses URLs on DBCS systems, a web site operator could make it appear that the content from his or her web site actually originated from another site.

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Impact

By making a malicious web site appear to be a site that the user trusts, an attacker could convince the user to provide sensitive information.

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Solution

Apply a patch

Apply the patch referenced in MS04-038.

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Vendor Information

431576

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Updated: October 13, 2004

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

The vendor has not provided us with any further information regarding this vulnerability.

Addendum

Please see <http://www.microsoft.com/technet/security/bulletin/ms04-038.mspx&gt;

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23431576 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

• <http://www.microsoft.com/technet/security/bulletin/MS04-038.mspx&gt;
• <http://securitytracker.com/alerts/2004/Oct/1011643.html&gt;

Acknowledgements

Thanks to Microsoft for reporting this vulnerability.

This document was written by Will Dormann, based on the information provided in the Microsoft Security Bulletin.

Other Information

CVE IDs:	CVE-2004-0844
Severity Metric:	1.98 Date Public: