Rule:  
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Sid:
1104

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Summary:
This event is generated when an attempt is made to evade an IDS in a possible 
web attack by sending an obfuscated request in small increments.

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Impact:
Unknown.

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Detailed Information:
Under normal circumstances, a web request fits inside a single packet. However,
it is possible to obfuscate a web attack by sending the attack one character
at a time.  This may evade some IDS systems. Tools such as Whisker can
be configured to do this.

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Affected Systems:
	All Web Servers
 
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Attack Scenarios:
An attacker can use an automated tool, like Whisker, to launch an attack
against a web server.

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Ease of Attack:
Simple. Exploits and tools are widely available.

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False Positives:
None Known

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False Negatives:
None Known

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Corrective Action:
Check the host for signs of compromise.

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Contributors:
Original rule writer unknown
Original document author unkown
Sourcefire Vulnerability Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

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