Rule:

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Sid:
972

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Summary:
This event is generated when an attempt is made to access an Active Server Page (ASP) .asp file when the period is hex encoded as "%2e". 

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Impact:
Intelligence gathering activity.  A vulnerability exists that discloses the .asp file contents when it is reference using the "%2e" hex encoding. 

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Detailed Information:
Microsoft Internet Information Service (IIS) uses Active Server Page to supply HTML and server-side scripting.  ASP files use a .asp extension.  When the period of the .asp is hex-encoded with a "%2e" to reference an ASP file, the contents of the file are disclosed.

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Affected Systems:
Hosts running IIS 3.0

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Attack Scenarios:
An attacker can attempt use the hex-encoded reference to the .asp file to see the contents of the file.  Sensitive information may by disclosed depending on the selected file. 

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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:
Upgrade to a more current version of IIS.
 
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Contributors:
Original rule writer unknown
Modified by Brian Caswell <bmc@sourcefire.com>
Sourcefire Vulnerability Research Team
Judy Novak <judy.novak@sourcefire.com>

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Additional References:

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