Rule:   

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Sid: 328

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Summary: 
This event is generated when a Denial-of-Service (DoS) attack against a finger daemon is attempted.

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Impact: 
The attacker may overload the target machine or crash the finger daemon

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Detailed Information:
This event is generated when a specially crafted finger query is directed at a target UNIX host. 

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 attack will crash or overload the vulnerable machines.

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Attack Scenarios: 
The attacker needs to send specially crafted packets to the finger daemon on a host.

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Ease of Attack: 
Moderate, no exploit software is required, just a specially formatted finger query

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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 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=CAN-1999-0106

Arachnids:
http://www.whitehats.com/info/IDS381

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