Vulnerability Note VU#753044

Microsoft Windows WebViewFolderIcon ActiveX integer overflow

Overview

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.

I. Description

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.

II. Impact

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.

III. Solution

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:

{844F4806-E8A8-11d2-9652-00C04FC30871}

{E5DF9D10-3B52-11D1-83E8-00A0C90DC849}

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.

Systems Affected

Vendor	Status	Date Notified	Date Updated
Microsoft Corporation	Vulnerable	10-Oct-2006

References

http://www.us-cert.gov/cas/techalerts/TA06-270A.html
http://www.microsoft.com/technet/security/Bulletin/MS06-057.mspx
http://www.microsoft.com/technet/security/advisory/926043.mspx
http://www.us-cert.gov/reading_room/securing_browser/#Internet_Explorer
http://browserfun.blogspot.com/2006/07/mobb-18-webviewfoldericon-setslice.html
http://osvdb.org/27110
http://xforce.iss.net/xforce/xfdb/27804
http://www.securityfocus.com/bid/19030
http://www.bleedingsnort.com/forum/viewtopic.php?forum=3&showtopic=1888
http://secunia.com/advisories/22159/
http://isc.sans.org/diary.php?storyid=1742
http://jvn.jp/cert/JVNTA06-270A/index.html

Credit

This vulnerability was publicly disclosed by HD Moore.

This document was written by Will Dormann.

Other Information

Date Public:	2006-07-18
Date First Published:	2006-09-27
Date Last Updated:	2006-10-10
CERT Advisory:
CVE-ID(s):	CVE-2006-3730
NVD-ID(s):	CVE-2006-3730
US-CERT Technical Alerts:
Metric:	69.25
Document Revision:	16

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Produced 2006 by US-CERT, a government organization
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