Vulnerability Note VU#585123

Microsoft Internet Explorer executes script code in cookies in the Local Computer zone

Original Release date: 29 Mar 2002 | Last revised: 29 Mar 2002


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


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.


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


Apply vendor patches available from

Systems Affected (Learn More)

VendorStatusDate NotifiedDate Updated
Microsoft CorporationAffected-29 Mar 2002
If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group Score Vector
Base N/A N/A
Temporal N/A N/A
Environmental N/A N/A



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

This document was written by Ian A. Finlay.

Other Information

  • CVE IDs: CAN-2002-0078
  • Date Public: 29 Mar 2002
  • Date First Published: 29 Mar 2002
  • Date Last Updated: 29 Mar 2002
  • Severity Metric: 35.64
  • Document Revision: 11


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