Rule: -- Sid: 119-11 -- Summary: This event is generated when the pre-processor http_inspect detects network traffic that may constitute an attack. -- Impact: Unknown. This event may also constitute an attempt to evade an IDS. -- 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. -- Affected Systems: Microsoft IIS Servers -- Attack Scenarios: An attacker may supply a path to a file outside the web root by using "../" in the uri. -- Ease of Attack: Simple. -- False Positives: This event may be generated if a web site uses "../" in links to other files on the site. -- 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 --
