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                   National Cyber Alert System

            Technical Cyber Security Alert TA08-189A


Microsoft Office Snapshot Viewer ActiveX Vulnerability

   Original release date: July 7, 2008
   Last revised: --
   Source: US-CERT


Systems Affected

     * Microsoft Office Access 2000
     * Microsoft Office Access XP
     * Microsoft Office Access 2003
     * Microsoft Office Snapshot Viewer


Overview

   An unpatched vulnerability in the Microsoft Office Snapshot Viewer ActiveX
   control is being used in attacks.


I. Description

   Microsoft has released Security Advisory (955179) to describe attacks on a
   vulnerability in the Microsoft Office Snapshot Viewer ActiveX control.
   Because no fix is currently available for this vulnerability, please see the
   Security Advisory and US-CERT Vulnerability Note VU#837785 for workarounds.


II. Impact

   A remote, unauthenticated attacker could execute arbitrary code.


III. Solution

Apply workarounds

   Microsoft  has provided workarounds for this vulnerability in Security
   Advisory  (955179). Additional details and workarounds are provided in
   US-CERT Vulnerability Note VU#837785.

   The most effective workaround for this vulnerability is to set kill bits for
   the Snapshot Viewer ActiveX control, as outlined in the documents noted
   above. Other workarounds include disabling ActiveX, as specified in the
   Securing Your Web Browser document, and upgrading to Internet Explorer 7,
   which can help mitigate the vulnerability with its ActiveX opt-in feature.


IV. References

     * US-CERT Vulnerability Note VU#837785 -
       <http://www.kb.cert.org/vuls/id/837785>

     * Microsoft Security Advisory (955179) -
       <http://www.microsoft.com/technet/security/advisory/955179.mspx>

     * Securing Your Web Browser -
       <http://www.us-cert.gov/reading_room/securing_browser/>


 ____________________________________________________________________

   The most recent version of this document can be found at:

     <http://www.us-cert.gov/cas/techalerts/TA08-189A.html>
 ____________________________________________________________________

   Feedback can be directed to US-CERT Technical Staff. Please send
   email to <cert@cert.org> with "TA08-189A Feedback VU#837785" in the
   subject.
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   For instructions on subscribing to or unsubscribing from this
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   Produced 2008 by US-CERT, a government organization.

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     <http://www.us-cert.gov/legal.html>
 ____________________________________________________________________


Revision History

   July 7, 2008: Initial release




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