File: 1133.txt

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Rule:  
 
--
Sid:

1133

--
Summary:
This event is generated when the Cybercop vulnerability scanner is used 
against a host.

--
Impact:
Cybercop can be used to identify vulnerabilities on host systems.

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Detailed Information:

This particular packet is a part of Cybercop's OS identification.  
Specially crafted packets are able to elicit different responses from 
different operating systems.  This packet is likely to be part of a full
Cybercop scan rather than an isolated event. 

--
Affected Systems:

All

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Attack Scenarios:
Cybercop can be used by attackers to determine vulnerabilities present 
on a host or network of hosts that could be used as attack vectors.

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Ease of Attack:
Simple

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False Positives:
This tool can be used legitimately by system and network administrators.
Other vulnerability scanners may display the same behavior.

--
False Negatives:

None known.
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Corrective Action:
TCP packets with SYN, FIN and PUSH set at the same time are abnormal, 
use a packet filtering firewall to block them.

--
Contributors:
Sourcefire Research Team
Brian Caswell <bmc@sourcefire.com>
Nigel Houghton <nigel.houghton@sourcefire.com>
Snort documentation contributed by Steven Alexander<alexander.s@mccd.edu>

-- 
Additional References:

Arachnids:
http://www.whitehats.com/info/IDS145

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