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                                   CERT-Renater

                        Note d'Information No. 2010/VULN563
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DATE                      : 29/12/2010

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Systems running Microsoft WMI Administrative Tools
                                 WBEMSingleView.ocx ActiveX control.

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http://www.kb.cert.org/vuls/id/725596
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Vulnerability Note VU#725596
Microsoft WMI Administrative Tools WBEMSingleView.ocx ActiveX control
vulnerability

Overview

The ActiveX control, WBEMSingleView.ocx, that is a part of the WMI
Administrative Tools package contains a vulnerability.


I. Description

The AddContextRef() and ReleaseContext() functions of the WMI Object Viewer
control can be passed an object pointer from an attacker that results in
arbitrary code execution. An Internet Explorer user with WBEMSingleView.ocx
installed can be exploited by visiting a malicious web page.


II. Impact

An attacker can execute arbitrary code as the user.


III. Solution

We are currently unaware of a practical solution to this problem.

Disable the WMI Object Viewer ActiveX control in Internet Explorer

The vulnerable ActiveX control can be disabled in Internet Explorer by
setting the kill bit for the following CLSID:

      {2745E5F5-D234-11D0-847A-00C04FD7BB08}


More information about how to set the kill bit is available in Microsoft
Support Document 240797. Alternatively, the following text can be saved as a
.REG file and imported to set the kill bit for this control:

      Windows Registry Editor Version 5.00

      [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\ActiveX Compatibility\{2745E5F5-D234-11D0-847A-00C04FD7BB08}]
      "Compatibility Flags"=dword:00000400
      [HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Internet Explorer\ActiveX Compatibility\{2745E5F5-D234-11D0-847A-00C04FD7BB08}]
      "Compatibility Flags"=dword:00000400

Disable ActiveX

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


Vendor Information

Vendor			Status			Date Notified	Date Updated
Microsoft Corporation	Affected		2010-12-22
References

http://www.cert.org/tech_tips/securing_browser/
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=6430f853-1120-48db-8cc5-f2abdc3ed314
http://support.microsoft.com/kb/240797
http://www.wooyun.org/bugs/wooyun-2010-01006
http://secunia.com/advisories/42693


Credit

This vulnerability was publicly disclosed on WooYun.org.

This document was written by Jared Allar.
Other Information
Date Public:			2010-12-22
Date First Published:		2010-12-22
Date Last Updated:		2010-12-22
CERT Advisory:	
CVE-ID(s):	
NVD-ID(s):	
US-CERT Technical Alerts:	
Severity Metric:		3.94
Document Revision:		13

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


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