Rule:

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Sid:
462

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Summary:
This event is generated when an ICMP Type 7 datagram with an undefined ICMP Code is detected on the network. 

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Impact:
ICMP Type 7 datagrams are not currently used by any known devices.

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Detailed Information:
ICMP Type 7 is not defined for use and is not expected network activity.  Any ICMP datagram with an undefined ICMP Code should be investigated.  

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Attack Scenarios:
None known

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Ease of Attack:
Numerous tools and scripts can generate this type of ICMP datagram.

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False Positives:
None known

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False Negatives:
None known
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Corrective Action:
Ingress filtering should be utilized to block incoming ICMP Type 7 datagrams
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Contributors:
Original Rule writer unknown
Sourcefire Research Team
Matthew Watchinski (matt.watchinski@sourcefire.com)
Nigel Houghton <nigel.houghton@sourcefire.com>

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Additional References:
None


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