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AA-2008.0097                  AUSCERT Advisory

                                   [Win]
        Zune Software ActiveX Control - Arbitrary file modification
                                1 May 2008
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        AusCERT Advisory Summary
        ------------------------

Product:              Zune ActiveX control
Operating System:     Windows
Impact:               Modify Arbitrary Files
Access:               Remote/Unauthenticated
Member content until: Wednesday, May 28 2008

Revision History:  May 1 2008: Corrected bulletin ID
                   April 30 2008: Initial Release


OVERVIEW:

        A vulnerability has been identified in the Zune Software ActiveX
        control which allows arbitrary file modification.


IMPACT: 

        If a user visits a malicious web page, the attacker can overwrite an 
        arbitrary file.


MITIGATION:

        AusCERT recommends following the guidelines from our "Protecting 
        your computer from malicious code" [2], and exercising caution when
        visiting untrusted web sites. It can be further mitigated by having
        appropriate ACLs in place.

        The 'kill bit' can also be set for the Zune ActiveX control to
        prevent Internet Explorer from initialising the ActiveX control.

        The CLSID for Zune ActiveX is:

            {0B1C3B47-207F-4CEA-8F31-34E4DB2F6EFD}

        More information on setting the kill bit for ActiveX controls can be
        found in Microsoft Knowledge Base Article 240797 [3].


REFERENCES

        [1] Zune Software ActiveX Arbitrary File
            http://milw0rm.com/exploits/5489

        [2] Protecting your computer from malicious code
            http://www.auscert.org.au/3352

        [3] How to stop an ActiveX control from running in Internet Explorer
            http://support.microsoft.com/kb/240797


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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