The system must ignore IPv6 Internet Control Message Protocol (ICMP ) redirect messages.

From HP-UX 11.31 Security Technical Implementation Guide

Part of GEN007860

Associated with IA controls: ECSC-1

Associated with: CCI-001551

SV-35241r1_rule The system must ignore IPv6 Internet Control Message Protocol (ICMP ) redirect messages.

Vulnerability discussion

ICMP redirect messages are used by routers to inform hosts of a more direct route existing 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.

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Fix text

Add an IPF rule to block inbound IPv6 ICMP redirect packets. Edit /etc/opt/ipf/ipf6.conf and add a rule such as: block in quick proto icmpv6 from any to any icmpv6-type 137 Reload the IPF rules. # ipf -6 -Fa -A -f /etc/opt/ipf/ipf6.conf

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