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Rule:
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Sid:
119-13
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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.
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Detailed Information:
This event is generated when the http_inspect pre-processor detects the
use of a newline "\n" character as a delimeter. This is non-standard but
is accepted by both Apache and IIS web servers.
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Affected Systems:
All web servers
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Attack Scenarios:
An attacker may supply the newline character as the delimeter in a web
request.
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Ease of Attack:
Simple.
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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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