Rule:

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Sid: 611

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Summary: 
This event is generated when a remote login attempt using rlogin fails.

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Impact: 
Someone has tried to login using rlogin and failed

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Detailed Information: 
This rule generates an event when a login failure message generated by rlogind is seen. rlogin is used on UNIX systems for remote connectivity and remote command execution.  

Multiple events may indicate that an attacker is attempting a brute force password guessing attack.

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Attack Scenarios: 
An attacker finds a machine with rlogin service running and proceeds to guess the password remotely by connecting multiple times.

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Ease of Attack: 
Simple, no exploit software required

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False Positives: 
A legitimate user may generate an event by entering an incorrect password.

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False Negatives:
None Known

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Corrective Action: 
Investigate logs on the target host for further details and more signs of suspicious activity

Use ssh for remote access instead of rlogin.

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Contributors: 
Original rule by Max Vision <vision@whitehats.com> modified from a signature written by Ron Gula
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-1999-0651

Arachnids:
http://www.whitehats.com/info/IDS392

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