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Rule:
--
Sid:
119-17
--
Summary:
This event is generated when the pre-processor http_inspect
detects network traffic that may constitute an attack.
--
Impact:
Unknown. This may indicate improper use of unauthorized web proxy
servers.
--
Detailed Information:
This event is generated when the http_inspect pre-processor detects the
use of an unauthorized web proxy by clients on the protected network.
This event may also be generated if a web client is not using one of the
configured proxy servers to browse the web.
--
Affected Systems:
All client systems.
--
Attack Scenarios:
A malicious user may try to use an unauthorized proxy server in an
attempt to subvert company policy on the use of the Internet.
--
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
--
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