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A  U  S  C  E  R  T                                           A  L  E  R  T

                       AL-2007.0018 -- AUSCERT ALERT
                                   [Win]
          Vulnerability in HTML Help ActiveX Control Could Allow
                      Remote Code Execution (928843)
                             14 February 2007

===========================================================================

        AusCERT Alert Summary
        ---------------------

Product:              HTML Help ActiveX Control
Publisher:            Microsoft
Operating System:     Windows Server 2003
                      Microsoft Windows XP
                      Microsoft Windows 2000
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
CVE Names:            CVE-2007-0214

Ref:                  ESB-2006.0561

Original Bulletin:    
  http://www.microsoft.com/technet/security/Bulletin/ms07-008.mspx

Comment: The Microsoft web site has listed the following workaround for this
         vulnerability:
         
         To protect against this vulnerability, set the kill bit for the
         ActiveX control to temporarily disable the HTML Help ActiveX and
         keep it from running in Internet Explorer.
         
         The CLSID for an ActiveX control is a GUID for that control. You
         can prevent an ActiveX control from running in Internet Explorer
         by setting the kill bit so that the control is never called by
         Internet Explorer. The kill bit is a specific value for the
         Compatibility Flags DWORD value for the ActiveX control in the
         registry.
         
         The CLSID for the HTML Help ActiveX control is
         {52a2aaae-085d-4187-97ea-8c30db990436}
         
         More information about limiting the Active X controls in Internet
         Explorer can be found at:
         
         http://support.microsoft.com/kb/240797

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MS07-008 - Vulnerability in HTML Help ActiveX Control Could Allow Remote Code 
           Execution (928843)

Affected Software: 
   - Microsoft Windows 2000 Service Pack 4 -- Download the update
   - Microsoft Windows XP Service Pack 2 -- Download the update
   - Microsoft Windows XP Professional x64 Edition -- Download the
     update
   - Microsoft Windows Server 2003 and Microsoft Windows Server 2003
     Service Pack 1 -- Download the update
   - Microsoft Windows Server 2003 for Itanium-based Systems and Microsoft
     Windows Server 2003 with SP1 for Itanium-based Systems -- Download
     the update
   - Microsoft Windows Server 2003 x64 Edition -- Download the update

Non-Affected Software:
   - Windows Vista

Full MS07-008 advisory:
   http://www.microsoft.com/technet/security/Bulletin/ms07-008.mspx

Vulnerability Details

HTML Help ActiveX Control Vulnerability - CVE-2007-0214

   A remote code execution vulnerability exists in the HTML Help ActiveX
   control. An attacker could exploit the vulnerability by constructing a
   specially crafted Web page that could potentially allow remote code
   execution if a user visited that page. An attacker who successfully
   exploited this vulnerability could take complete control of an
   affected system.

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
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