Ensure ndpd-host is not in use

MediumLevel 1Automatedaix

Description

This entry starts ndpd-host on system startup. This is the Neighbor Discovery Protocol (NDP) daemon. The ndpd-host command handles the default route, which includes the default router, the default interface, and the default interface address. However, the ndpd-host command does not overwrite the static default routes that are set on the host. Audit: the ndpd-host start line in /etc/rc.tcpip must be commented out and the ndpd-host subsystem must not be active.

How it is checked

Audit method: Shell command

shell

command -v lssrc >/dev/null 2>&1 || exit 1; [ -r /etc/rc.tcpip ] || exit 1; out=$( { grep -E "^[[:blank:]]*start[[:blank:]]+/usr/(sbin|lib)/ndpd-host([[:blank:]]|$)" /etc/rc.tcpip; lssrc -s ndpd-host | awk 'NR>1 && $NF=="active"' ; } 2>/dev/null ); [ -z "$out" ] && echo compliant || printf '%s\n' "$out" | head -n 20

Expected output: compliant

How it is fixed

Fix method: Guidance or infrastructure patch

In /etc/rc.tcpip, comment out the ndpd-host entry: chrctcp -d ndpd-host

Properties

Operating systems: Any
Tags: aixhardening
Reference: CIS IBM AIX 7 Benchmark v1.2.0 - 4.3.3.2 Ensure ndpd-host is not in use

Check this host

Run this on a machine you are allowed to audit. The scan is read-only.

shell

tmaegis scan --target aix