119-14.txt

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Rule: 

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Sid: 
119-14

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Summary: 
This event is generated when the pre-processor http_inspect
detects network traffic that may constitute an attack.

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Impact: 
Unknown.

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Detailed Information:
This event is generated when the http_inspect pre-processor detects the
use of non-standard RFC defined characters are used in a web request.

The characters generating the events are user configured.

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Affected Systems:
	All web servers

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Attack Scenarios: 
An attacker may use non-standard characters in a request in an attempt
to evade an IDS in the course of an attack against a web 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:
Check the target host for signs of compromise.

Apply any appropriate vendor supplied patches.

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Contributors:
Daniel Roelker <[e-mail]> 
Sourcefire Vulnerability Research Team
Nigel Houghton <[e-mail]>

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Additional References:

HTTP IDS Evasions Revisited - Daniel Roelker
http://docs.idsresearch.org/http_ids_evasions.pdf

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