Rule:
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Sid:  
967

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Summary:  
dvwssr.dll is a component installed with Windows NT Option Pack 4.0, 
Personal Web Server for Windows 95 and 98 and Front Page 98 Server 
Extensions. This component is vulnerable to a buffer overflow which 
may allow for the execution of arbitrary code that would run in the 
context of the system account.

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Impact:
Serious. Execution of arbitrary code and Denial of Service (DoS).

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Detailed Information:  
As with an abundance of other exploits related to Microsoft's Internet 
Information Services and web server based implementations, it is 
possible for an attacker to run code of choice against the vulnerable 
web server.  It is also possible to use this exploit to stop the remote 
server from responding which would result in a DoS.

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Attack Scenarios:  
   

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Ease of Attack:  
This attack would require for both the dvwssr.dll file to reside on the 
web server and for the correct permissions to be in place in order for 
the attack to be successful.  Using a script to send continued requests 
for the file dvwssr.dll would make a denial of service attack fairly 
easy.

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False Positives:  
Web requests or web based applications which use dvwssr.dll in a context
which in not malicious in nature.

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False Negatives:
None Known

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Corrective Action:  
Remove dvwssr.dll from the web server and test all necessary 
functionality.  See additional references for more information.

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Contributors:
Original rule writer unknown
Snort documentation contributed by Chris Arsenault	<carsenault@firstedcu.org> and Josh Gray
Sourcefire Vulnerability Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>


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Additional References:

Security Focus BugTraq ID
http://www.securityfocus.com/bid/1109

CVE
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2000-0260

Microsoft ms00-025
http://www.microsoft.com/technet/treeview/default.asp?url=/technet/security/bulletin/ms00-025.asp
 

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