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CERT Coordination Center

Microsoft Windows WebViewFolderIcon ActiveX integer overflow

Vulnerability Note VU#753044

Original Release Date: 2006-09-27 | Last Revised: 2006-10-10


The Microsoft Windows WebViewFolderIcon ActiveX control contains an integer overflow vulnerability. This may allow a remote, unauthenticated attacker to execute arbitrary code on a vulnerable system.


The Microsoft WebViewFolderIcon object is an ActiveX control that comes with Microsoft Windows. This control, which is provided by the file webvw.dll, provides support functionality for icons in the Windows Explorer Web view. The slice method of the WebViewFolderIcon control contains an integer overflow vulnerability.


By convincing a user to view a specially crafted HTML document (e.g., a web page or an HTML email message or attachment), an attacker may be able to execute arbitrary code with the privileges of the user. The attacker could also cause Internet Explorer (or the program using the WebBrowser control) to crash.The complete impact of this vulnerability is not yet known.


Apply an update

This vulnerability is addressed in Microsoft Security Bulletin MS06-057.

Disable the WebViewFolderIcon ActiveX control

The WebViewFolderIcon ActiveX control can be disabled by setting the kill bit for the following CLSIDs:

More information about how to set the kill bit is available in Microsoft Support Document 240797.

Disable ActiveX

Disabling ActiveX controls in the Internet Zone (or any zone used by an attacker) appears to prevent exploitation of this vulnerability. Instructions for disabling ActiveX in the Internet Zone can be found in the "Securing Your Web Browser" document and the Malicious Web Scripts FAQ.

Vendor Information


Microsoft Corporation Affected

Notified:  September 27, 2006 Updated: October 10, 2006



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.


Please see Microsoft Security Bulletin MS06-057.

If you have feedback, comments, or additional information about this vulnerability, please send us email.

CVSS Metrics

Group Score Vector



This vulnerability was publicly disclosed by HD Moore.

This document was written by Will Dormann.

Other Information

CVE IDs: CVE-2006-3730
Severity Metric: 69.26
Date Public: 2006-07-18
Date First Published: 2006-09-27
Date Last Updated: 2006-10-10 19:33 UTC
Document Revision: 17

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