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             AUSCERT External Security Bulletin Redistribution

            ESB-2004.0760 -- Buffer Overflow In ISAPI Extension
                 W3who.dll From Windows 2000 Resource Kit
                              8 December 2004

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

Product:           W3who.dll (Windows 2000 Resource Kit)
Operating System:  Windows
Impact:            Execute Arbitrary Code/Commands
Access:            Remote/Unauthenticated
CVE Names:         CAN-2004-1134

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PROBLEM:

	A buffer overflow vulnerability exists in W3who.dll potentially 
	allowing remote execution of arbitrary code.

	W3who.dll is the Browser Client Context Tool, an Internet Server API 
	(ISAPI) extension used for testing IIS web servers. It is provided in 
	the Windows 2000 Resource Kit and is not installed by default. 

	This dll can be called from a HTML or ASP web page on an IIS web server
	to return a HTML stream to a browser with information about the server 
	configuration and the browsers connection and authentication method.


IMPACT:   

	A remote attacker with the ability to craft a custom request to the 
	web server allowing access to this dll may be able to execute arbitrary 
	code on the IIS web server.


MITIGATION: 

	Remove the w3who.dll file from your virtual servers, and reconfigure 
	any pages to remove links referencing this dll.

	Microsoft reportedly has no plans to provide an updated version at 
	this stage.


REFERENCES:

	Further information is available in the original advisory:
	http://www.exaprobe.com/labs/advisories/esa-2004-1206.html


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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
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