Rule:

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Sid:
475

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Summary:
This event is generated when a network host generates an ICMP datagram with Record Route IP options.

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Impact:
Packets containing IP Record Route options are used to emulate the functionality of traceroute. 

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Detailed Information:
The Record Route IP option is used to store routing information about the path a datagram takes to its destination.  ICMP ECHO packets with an IP header utilizing the Record Route option are used to emulate the functionality of traceroute.

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Attack Scenarios:
A remote attacker may attempt to use the Record Route IP option to determine routing information if traceroute fails.

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

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False Positives:
Network diagnostic tools may generate these types of datagrams.

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False Negatives:
None known

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Corrective Action:
Use ingress filtering to block incoming datagrams with the IP Record Route option.

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

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Additional References:

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