The system must ignore IPv4 ICMP redirect messages.

From SOLARIS 10 X86 SECURITY TECHNICAL IMPLEMENTATION GUIDE

SV-26630r2_rule The system must ignore IPv4 ICMP redirect messages.

Vulnerability discussion

ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.

Check content

Determine the type of zone that you are currently securing. # zonename If the zone is not the global zone, determine if any interfaces are exclusive to the zone: # dladm show-link If the output indicates "insufficient privileges" then this requirement is not applicable. If the zone is the global zone or the non-global zone has exclusive interfaces verify the system does not accept IPv4 ICMP redirect messages. Procedure: # ndd -get /dev/ip ip_ignore_redirect If the result is not 1, this is a finding.

Fix text

Configure the system to not accept IPv4 ICMP redirect messages. Procedure: # ndd -set /dev/ip ip_ignore_redirect 1 This command must also be added to a system startup script.

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