The IPv6 protocol handler must not be bound to the network stack unless needed.

From Red Hat Enterprise Linux 5 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-001551

SV-37606r1_rule The IPv6 protocol handler must not be bound to the network stack unless needed.

Vulnerability discussion

IPv6 is the next version of the Internet protocol. Binding this protocol to the network stack increases the attack surface of the host.

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Fix text

Remove the capability to use IPv6 protocol handler. Procedure: Edit /etc/sysconfig/network and change NETWORKING_IPV6=yes to NETWORKING_IPV6=no Edit /etc/modprobe.conf and add these lines (if they are not in it): alias net-pf-10 off alias ipv6 off Stop the ipv6tables service by typing: service ip6tables stop Disable the ipv6tables service by typing: chkconfig ip6tables off Remove the ipv6 kernel module # rmmod ipv6 Reboot

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