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AA-2007.0123                  AUSCERT Advisory

                                   [Win]
           A vulnerability in Windows Media Player 6.4 may allow
                        execution of arbitrary code
                             10 December 2007
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        AusCERT Advisory Summary
        ------------------------

Product:              Windows Media Player 6.4
Operating System:     Windows
Impact:               Execute Arbitrary Code/Commands
Access:               Remote/Unauthenticated
Member content until: Monday, January 07 2008

OVERVIEW

        Windows Media Player 6.4 (also known as 'Media Player Classic')
        contains a buffer overflow vulnerability in its 3ivx MP4 codec. [1]

        While this is an old version of Windows Media Player, it is used
        by certain software to access DirectShow functionality, and may
        be installed as mplayer2.exe by these applications.


IMPACT

        Specially crafted MP4 files, when opened by Media Player 6.4, may
        allow remote attackers to execute arbitrary code with the
        permissions of the user opening the file.

        As the flaw is in the codec, any other programs that use it may
        also be affected. One other such product that has been flagged as
        possibly affected is Nullsoft Winamp 5.


MITIGATION

        At the moment there are no patches available for this vulnerability.
        The 3ivx MP4 codec in particular is affected - removal of this codec
        would successfully mitigate against this vulnerability, however
        non-malicious MP4 files would not be able to be played.

        Until this vulnerability is patched, unknown or untrusted MP4 files
        should not be opened.


REFERENCES

        [1] Security Focus - Windows Media Player Remote Stack Buffer
                             Overflow Vulnerability
            http://www.securityfocus.com/bid/26773/info

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

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