The system must ignore IPv4 ICMP redirect messages.

From HP-UX 11.23 Security Technical Implementation Guide

Part of GEN003609

Associated with IA controls: ECSC-1

Associated with: CCI-001503 CCI-001551

SV-29719r1_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

Fix text

Edit /etc/opt/ipf/ipf.conf and add rules to block incoming IPv4 ICMP redirect messages, such as: block in quick proto icmp from any to any icmp-type redir Reload the IPF rules. Flush the rules from your ruleset using the -Fa option. The -A option specifies the active rules list. The -f option specifies the rules configuration file to be used: # ipf -Fa -A -f /etc/opt/ipf/ipf.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.

Powered by sagemincer