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                         AUSCERT Security Bulletin

                               ASB-2009.1011
          Microsoft Office Web Components: Execute arbitrary code
                               14 July 2009

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

Product:              Microsoft Office XP Service Pack 3
                      Microsoft Office 2003 Service Pack 3
                      Microsoft Office XP Web Components Service Pack 3
                      Microsoft Office Web Components 2003 Service Pack 3
                      Microsoft Office 2003 Web Components for the 2007 
                       Microsoft Office system Service Pack 1
                      Microsoft Internet Security and Acceleration Server 
                       2004 Standard Edition Service Pack 3
                      Microsoft Internet Security and Acceleration Server 
                       2004 Enterprise Edition Service Pack 3
                      Microsoft Internet Security and Acceleration Server 
                       2006
                      Internet Security and Acceleration Server 2006 
                       Supportability Update
                      Microsoft Internet Security and Acceleration Server 
                       2006 Service Pack 1
                      Microsoft Office Small Business Accounting 2006
Operating System:     Windows
Impact/Access:        Execute Arbitrary Code/Commands -- Remote/Unauthenticated
Resolution:           Mitigation
CVE Names:            CVE-2009-1136  
Member content until: Thursday, August 13 2009

OVERVIEW

        A vulnerability in Microsoft Office Web Components, which could
        allow remote execution of arbitrary code, is currently being 
        investigated.


IMPACT

        An ActiveX control used by Internet Explorer to display Excel
        spreadsheets is vulnerable to a remote code execution attack, with 
        privileges of the user running IE. Active exploitation of this 
        vulnerability has been confirmed. [1, 2]


MITIGATION

        Microsoft have provided a 'Fixit' workaround as well as instructions
        to manually disable the ActiveX control. [3]


REFERENCES

        [1] Vulnerability in Microsoft Office Web Components Control Could Allow Remote Code Execution
            http://www.microsoft.com/technet/security/advisory/973472.mspx

        [2] Vulnerability in Microsoft Office Web Components Control Could Allow Remote Code Execution
            http://isc.sans.org/diary.html?storyid=6778&rss

        [3] Microsoft Security Advisory: Vulnerability in Microsoft Office Web Components control could allow remote code execution
            http://support.microsoft.com/kb/973472

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

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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
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours 
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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