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Rule:
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Sid:
111-5
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Summary:
This event is generated when the pre-processor stream4
detects network traffic that may constitute an attack.
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Impact:
Unknown.
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Detailed Information:
This event indicates that the pre-processor stream4 has detected a
packet with only the SYN flag set that contains a payload. A packet with
this flag set is meant to only set up a session between a client and
server. Any data in a packet of this kind indicates malicious activity
is taking place.
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Affected Systems:
All systems
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Attack Scenarios:
An attacker can attempt to evade an IDS by sending a malicious payload
in a packet designed to set up a session.
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Ease of Attack:
Moderate.
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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.
Ensure the system is up to date with any appropriate vendor supplied patches.
--
Contributors:
Martin Roesch <roesch@sourcefire.com>
Sourcefire Vulnerability Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>
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Additional References:
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