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

From HP-UX 11.23 Security Technical Implementation Guide

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.

Check content

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

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.