Rule: 

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Sid: 
119-12

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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: 
Unkown.

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Detailed Information:
This event is generated by the http_inspect pre-processor when a tab
character is detected in a web request. This is non-standard, but Apache
web servers may use this character as a space delimeter.

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Affected Systems:
	Apache web servers

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Attack Scenarios: 
An attacker may supply the tab character in place of a space in a web
request.

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Ease of Attack: 
Simple.

-- 
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.

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

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Additional References:

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

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