The system must not respond to ICMPv6 echo requests sent to a broadcast address.

From HP-UX 11.31 Security Technical Implementation Guide

Part of GEN007950

Associated with IA controls: ECSC-1

Associated with: CCI-000366

SV-29786r1_rule The system must not respond to ICMPv6 echo requests sent to a broadcast address.

Vulnerability discussion

Responding to broadcast ICMP echo requests facilitates network mapping and provides a vector for amplification attacks.

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Fix text

Add an IPF rule to block inbound IPv6 ICMP ECHO_REQUEST packets sent to the all-hosts multicast address. Edit /etc/opt/ipf/ipf6.conf and add a rule such as: block in quick proto icmpv6 from any to ff02::1 icmpv6-type 128 Reload the IPF rules. # ipf -6 -Fa -A -f /etc/opt/ipf/ipf6.conf

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