Microsoft Internet Explorer may handle certain web pages in an incorrect, less restrictive security zone (MS02-023)

Overview

Microsoft Internet Explorer (IE) may handle malformed Internet pages accessed through the NetBIOS protocol as if they belong to the IE’s Intranet or Trusted Sites security zones, instead of the more restrictive Internet security zone.

Description

If a user views a page on the Internet that has been malformed in a certain way to exploit the client’s particular configuration, then IE may render the page using the less restrictive security settings of the Intranet zone or the Trusted Sites zone. This vulnerability cannot be exploited unless the user views the page using the NetBIOS protocol instead of HTTP.

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Impact

A malicious web page may be rendered on the client host using less restrictive security settings than are appropriate for Internet pages. The specific impacts depend on the privileges specified in the client’s settings for the Intranet and Trusted Sites zones.

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Solution

Apply a patch from your vendor

See Microsoft Security Bulletin MS02-023 for more information:

<http://www.microsoft.com/technet/security/bulletin/MS02-023.asp&gt;

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Disable NetBIOS access to external networks.

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Vendor Information

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Microsoft Corporation __ Affected

Notified: May 30, 2002 Updated: June 04, 2002

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

See Microsoft Security Bulletin MS02-023 for more information:

<http://www.microsoft.com/technet/security/bulletin/MS02-023.asp&gt;

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23242891 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
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Environmental

References

• <http://www.microsoft.com/technet/security/bulletin/MS02-023.asp&gt;
• <http://www.securityfocus.com/bid/4753&gt;

Acknowledgements

Thanks to Microsoft for reporting this vulnerability.

This document was written by Shawn Van Ittersum.

Other Information

CVE IDs:	CVE-2002-0190
Severity Metric:	2.99 Date Public: