Rule:

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Sid:
1044

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Summary:
This event is generated when an attempt is made to disclose the contents of a file on an Internet Information Server (IIS) host. 

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Impact:
Intelligence gathering activity.  This attack can display the contents of an Activer Server Page (ASP) file or other files located on the server. 

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Detailed Information:
A vulnerability exists in Windows NT 4.0 Option Pack and Windows 2000 Index Server.  The Index Server is a search engine used by IIS that allows a user's browser to search for text in HTML and other documents.   The Index Server has a Hit-Hightlighting component to highlight the text that satisifies the user's query.  A vulnerability exists in the webhits.dll file used to process the search, allowing the disclosure of file contents.  The .htw file extension is used by webhits.dll to perform hit-highlighting capabilities.

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Affected Systems:
Hosts running Microsoft Index Server 2.0

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Attack Scenarios:
An attacker can attempt to disclose the contents of a file by crafting a special URL to access the Hit-Highlighting component of the Index Server. 

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Ease of Attack:
Simple. 

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False Positives:
None Known.

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False Negatives:
None Known.

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Corrective Action:
Apply the patch discussed in the referenced Microsoft Bulletin.
 
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Contributors:
Original rule writer unknown
Modified by Brian Caswell <bmc@sourcefire.com>
Sourcefire Research Team
Judy Novak <judy.novak@sourcefire.com>

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Additional References:

Arachnids
http://www.whitehats.com/info/IDS237

Bugtraq
http://www.securityfocus.com/bid/1084

CVE
http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2000-0302

Microsoft
http://www.microsoft.com/technet/security/bulletin/ms00-006.asp


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