Microsoft Internet Explorer does not adequately evaluate malformed URLs

Overview

Microsoft Internet Explorer contains a serious vulnerability in its handling of zone determination.

Description

Microsoft Internet Explorer contains a vulnerability in the way in which it handles zone determination. Specifically, HTML scripts stored in cookies should be executed in the same zone (typically the “Internet Zone”) as the site hosting the cookie. As a result of this vulnerability, a script embedded in a cookie can be executed in the Local Computer zone of the victim’s machine. This places systems at risk because the security policies of the “Local Computer Zone” are typically more permissive than those of the “Internet Zone.” Viewing a malicious HTML document such as a web page or HTML formatted email message can allow arbitrary commands to be executed on the victim’s machine.

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Impact

An attacker can execute arbitrary commands on the target system with the privileges of the victim.

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Solution

Apply vendor patches available from <http://www.microsoft.com/windows/ie/downloads/critical/Q319182/default.asp&gt;.

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Vendor Information

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Microsoft Corporation __ Affected

Updated: March 29, 2002

Status

Affected

Vendor Statement

Please see <http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/MS02-015.asp&gt;.

Vendor Information

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

Addendum

The CERT/CC has no additional comments at this time.

If you have feedback, comments, or additional information about this vulnerability, please send us [email](<mailto:[email protected]?Subject=VU%23585123 Feedback>).

CVSS Metrics

Group	Score	Vector
Base
Temporal
Environmental

References

<http://www.microsoft.com/technet/security/bulletin/MS02-015.asp&gt;

Acknowledgements

The CERT/CC thanks Microsoft for the information contained in MS02-015.

This document was written by Ian A. Finlay.

Other Information

CVE IDs:	CVE-2002-0078
Severity Metric:	35.64 Date Public: