Rule:

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Sid:
428

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Summary:
This event is generated when a host generates and ICMP Parameter Problem datagram with an undefined ICMP Code.

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Impact:
ICMP datagrams should never contain undefined ICMP Codes.  This is normally an indication of nefarious activity occurring on the network.

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Detailed Information:
A router generates a Parameter Problem message for any error not specifically covered by another ICMP message.  This could be an indication of routing problems on the network, or malfunctioning routing hardware.

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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:
ICMP Type 12 datagrams with undefined ICMP Codes are not normal network activity.  Hosts generating these types of datagrams should be investigated for configuration errors or nefarious activity.

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Contributors:
Original Rule writer unknown
Sourcefire Research Team
Matthew Watchinski (matt.watchinski@sourcefire.com)

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Additional References:
None


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