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             AUSCERT External Security Bulletin Redistribution

                               ESB-2010.1177
           Microsoft WMI Administrative Tools WBEMSingleView.ocx
                       ActiveX control vulnerability
                             24 December 2010

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Microsoft WMI Administrative Tools
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Mitigation
CVE Names:         CVE-2010-4588 CVE-2010-3973 

Original Bulletin: 
   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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