Rule: 

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Sid: 
119-10

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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. This event may also constitute an attempt to evade an IDS.

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Detailed Information:
This event is generated when the http_inspect pre-processor detects the
use of directory traversal in a web request. This may be an attempt to
escape the web root directory or it may be an attempt to evade an IDS.

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Affected Systems:
	Microsoft IIS Servers

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Attack Scenarios: 
An attacker may supply a path to a file outside the web root by using
"../" in the uri.

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Ease of Attack: 
Simple.

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False Positives:
This event may be generated if a web site uses "../" in links to other
files on the site.

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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 <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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