420.txt

snort入侵检测规则文件2.4 Snort是众所周知的网络入侵检测工具

Rule:

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Sid:
420

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Summary:
This event is generated when a network host generates an ICMP Mobile Host Redirect datagram with an undefined ICMP code.

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Impact:

Undefined ICMP Code values should never be seen on the network.  This could be an indication of nefarious activity on the network.

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Detailed Information:
The Transparent Internet Routing for IP Mobile Hosts IETF draft defines ICMP Type 32 Code 0 as an ICMP Mobile Host Redirect Message.  This message was intended to be used by mobile computers to inform base-stations of their location on the network as they move from base-station to base-station.  In normal situations the ICMP Code should be set to 0, values other than 0 are undefined and should never be used.

This IETF draft was never ratified, and no hardware is known to exist that generates this type of ICMP datagram

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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 32 datagrams are not normal network activity.  Hosts generating these types of datagrams should be investigated for nefarious activity

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Contributors:
Original rule writer unknown
Sourcefire Research Team
Matthew Watchinski ([e-mail])

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Additional References:
None


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