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Rule:
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Sid: 608
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Summary:
This event is generated when an attempt to modify access control permissions for remote shell logins is attempted.
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Impact:
An attacker may have modified remote login permissions such that any host is allowed to initiate a remote session on the target host.
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Detailed Information:
The rule generates an event when system reconfiguration is attempted via "rsh".
The command "echo + +" is used to relax access control permissions for r-services to allow access from any site without the need for password authentication.
This activity is indicative of attempts to abuse hosts using a default configuration.
Some UNIX systems use the "rsh" service to allow a connection to the machine for establishing an interactive session.
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Attack Scenarios:
An attacker finds a machine with "rsh" enabled and reconfigures it to allow access from any location
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Ease of Attack:
Simple, no exploit software required
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False Positives:
None Known
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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:
http://www.whitehats.com/info/IDS388
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