The system must not send IPv4 ICMP redirects.

From HP-UX 11.31 Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-001551

SV-35038r1_rule The system must not send IPv4 ICMP redirects.

Vulnerability discussion

ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table possibly revealing portions of the network topology.

Check content

Verify the system does not send IPv4 ICMP redirect messages. # ndd -get /dev/ip ip_send_redirects If the return value/result is not 0, this is a finding.

Fix text

Configure the system to not send IPv4 ICMP redirect messages. # ndd -set /dev/ip ip_send_redirects 0 Edit /etc/rc.config.d/nddconf and add/set: TRANSPORT_NAME[x]=ip NDD_NAME[x]=ip_send_redirects NDD_VALUE[x]=0

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