Rule: -- Sid: 119-13 -- Summary: This event is generated when the pre-processor http_inspect detects network traffic that may constitute an attack. -- Impact: Unknown. -- 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. -- Affected Systems: All web servers -- Attack Scenarios: An attacker may supply the newline character as the delimeter in a web request. -- Ease of Attack: Simple. -- False Positives: None Known. -- False Negatives: None Known. -- 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> -- Additional References: HTTP IDS Evasions Revisited - Daniel Roelker http://docs.idsresearch.org/http_ids_evasions.pdf --
