Rule:  

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Sid:
1271

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Summary:
This event is generated when an attempt is made to probe a host for the rusers RPC service.

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Impact:
Information gathering.

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Detailed Information:
The rusers RPC service is used to remotely list all logged in users on a machine. This information may be useful to an attacker when targeting a remote host.

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Affected Systems:
All systems running the rusers RPC service
 
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Attack Scenarios:
An attacker runs a vulnerability assessment tool, or the standard Unix rusers command.  The attacker may use information gleaned from this to better target his attacks.

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Ease of Attack:
Simple. Tools to probe the rusers service come standard with most Unix variants.

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False Positives:
None Known

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False Negatives:
None Known

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Corrective Action:
Disable the rusers service.

Disallow access to RPC services from hosts external to the protected network

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Contributors:
Original rule writer unknown
Original document author unkown
Sourcefire Vulnerability Research Team
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:

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