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

                       AL-2004.039 -- AUSCERT ALERT
      Unpatched remotely exploitable vulnerability in Microsoft WINS
                             29 November 2004

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

Product:           WINS (Windows Internet Naming Service)
Publisher:         Microsoft
Operating System:  Windows Server 2003
                   Windows 2000
                   Windows NT
Impact:            Execute Arbitrary Code/Commands
Access:            Remote/Unauthenticated

Original Bulletin: http://support.microsoft.com/kb/890710

PROBLEM:
  
        Microsoft have acknowledged a possible security issue in WINS (Windows
        Internet Naming Service) which may allow the remote execution of code.


PLATFORM: 
	
	This vulnerability affects Microsoft Windows NT 4.0 Server, Microsoft
        Windows NT Server 4.0 Terminal Server Edition, Windows 2000 Server, 
        and Windows Server 2003. WINS is not present in default installations 
        of Windows.


IMPACT:   

	Successful exploitation of this vulnerability could make it possible 
        for an attacker to take control of a WINS server remotely.


MITIGATION: 

        Microsoft has not yet released patches for this vulnerability, but has 
        published the following mitigation strategies:

        o Block external access via TCP port 42 and UDP port 42.

        o Remove WINS, if it is not needed.

        o Use IPSec communication to help secure traffic between WINS Server 
          Replication Partners.

        For more information on these mitigation strategies, please see 
        Knowledge Base Article 890710:

        http://support.microsoft.com/kb/890710

        AusCERT will continue to monitor this vulnerability and any changes in
        exploit activity. AusCERT members will be updated as information 
        becomes available.

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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