Rule:

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Sid: 
100000138

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Summary: 
This event is generated when an attempt is made to exploit a known vulnerability in Microsoft Internet Information Server (IIS).

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Impact: 
Serious. Information Disclosure, application source code may be disclosed.

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Detailed Information:
A programming error in an error page for Microsoft IIS may result in the discloure of asp code disclosure on an affected system.

By making a request to a server using a modified SERVER_NAME variable, the underlying asp code is displayed in the error page returned to the requestor if the asp page generates an error.

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Affected Systems:
Microsoft IIS 6.0 and prior

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Attack Scenarios: 
An attacker can make a request to the server and modify the SERVER_NAME variable to be either localhost or 127.0.0.1, if the page returns an error the asp code is revealed.

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Ease of Attack: 
Simple. Exploit code exists.

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False Positives:
None Known

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False Negatives:
None Known

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Corrective Action: 
Apply the appropriate vendor supplied patch

Upgrade to the latest non-affected version of the software.

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Contributors: 
Original Rule writer rmkml <rmkml@free.fr>
Sourcefire Vulnerability Research Team
Alex Kirk <akirk@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

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