Rule: 

--
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.

-- 
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.

--
Affected Systems:
	All web servers

--
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.

-- 
Ease of Attack: 
Simple.

-- 
False Positives:
None Known.

--
False Negatives:
None Known.

-- 

Corrective Action:
Check the target host for signs of compromise.

Apply any appropriate vendor supplied patches.

--
Contributors:
Daniel Roelker <droelker@sourcefire.com> 
Sourcefire Vulnerability Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>

-- 
Additional References:

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

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