Rule:  
--

Sid:
1104

--

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.

--
Impact:
Unknown.

--
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.

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

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

--
False Positives:
None Known

--
False Negatives:
None Known

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

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

--
Additional References:

--
