Rule:
alert icmp $EXTERNAL_NET any -> $HOME_NET any (msg:"ICMP Traceroute"; itype: 30; icode: 0; sid:456; classtype:misc-activity; rev:4;)

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Sid:
456

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Summary:



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Impact:

Can be used as a reconnaissance tool.  Traceroute reveals information
about the layout of a network.

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Detailed Information:

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Affected Systems:
All

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Attack Scenarios:

Traceroute is often used against machines on a network prior to an
attack.

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Ease of Attack:
Simple

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False Positives:

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False Negatives:
None known.

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Corrective Action:
Block inbound ICMP type 30 messages.

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Contributors:
Original rule writer unknown
Sourcefire Research Team
Judy Novak <judy.novak@sourcefire.com>

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Additional References:

Miscellaneous
http://www.faqs.org/rfcs/rfc1393.html




