Rule:

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Sid:
384

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Summary:
This event is generated when an generic ICMP echo request is made.

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Impact:
Information gathering.  An ICMP echo request can determine if a host is active.

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Detailed Information:
An ICMP echo request is used by the ping command to elicit an ICMP echo reply from a listening live host.  This rule alerts on a generic ICMP request where no payload is included in the message or the payload does not match more specific rules. 

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Affected Systems:
All

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Attack Scenarios:
An attacker may attempt to determine live hosts in a network prior to launching an attack.

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Ease of Attack:
Simple

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False Positives:
An ICMP echo request may be used to legimately troubleshoot networking problems.

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False Negatives:
None known.

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Corrective Action:
Block inbound ICMP echo requests.

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Contributors:
Documented by Steven Alexander<alexander.s@mccd.edu>
Sourcefire Research Team
Judy Novak <judy.novak@sourcefire.com>

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Additional References:


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