Patch Available for "WPAD Spoofing" Vulnerability

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              AUSCERT External Security Bulletin Redistribution
                             
           ESB-1999.184 -- Microsoft Security Bulletin (MS99-054)
              Patch Available for "WPAD Spoofing" Vulnerability
                              03 December 1999

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Microsoft Corporation has released the following security bulletin
concerning a vulnerability in the Web Proxy Auto Detect feature of Internet 
Explorer 5.

This vulnerability may cause a client browser to search for a WPAD server 
outside the local network.  A bogus WPAD server may be configured to
provide arbitrary proxy settings to the client, if the proxy settings were
invalid.

This vulnerability affects Microsoft Internet Explorer 5.

If a bogus WPAD server provided proxy settings for a client which were invalid  then a denial of service attack may be made against the client's site.  

Additionally, if a bogus WPAD server was established to route local browser 
traffic from the client's site through a hostile user's site, then the 
malicious site may eavesdrop on the client site's browser traffic.

       http://www.microsoft.com/Security/Bulletins/MS99-054.asp


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This security bulletin is provided as a service to AusCERT's members.
As AusCERT did not write the document referenced above, AusCERT has
had no control over its content.  The decision to use any or all
of this information is the responsibility of each user or organisation,
and should be done so in accordance with site policies and procedures.

If you have any questions or need further information, please contact 
Microsoft Corporation directly.

Previous advisories and external security bulletins can be retrieved from:

	http://www.auscert.org.au/Information/advisories.html

If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).

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 emergencies.


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