Rule: 

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Sid:
331

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Summary:
This is an intelligence gathering activity. This event is indicative of an information leak attempt against a finger daemon performed by a vulnerability scanner

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Impact:
The attacker may obtain information about user accounts on the target system.

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Detailed Information:
This event is generated when an attempt to query the finger daemon is attempted by the Cybercop vulnerability scanner. 

The Finger daemon is used to provide information about users on a UNIX system. It used to be installed and enabled by default on most UNIX/Linux systems. The scan will confirm that the target host will respond to finger queries.

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Attack Scenarios: 
An attacker uses the Cybercop vulnerability scanner to test for this weakness.

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Ease of Attack: 
Simple, performed by a scanner

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False Positives: 
None Known

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False Negatives: 
None Known

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Corrective Action: 
Disable the finger daemon or limit the addresses that can access the service via a firewall or TCP wrappers.


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Contributors:
Original rule written by Max Vision <vision@whitehats.com>
Snort documentation contributed by Anton Chuvakin <http://www.chuvakin.org>
Sourcefire Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

CVE:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0612

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