Ensure ipsrcrouteforward is disabled

MediumLevel 1Automatedaix

Description

The ipsrcrouteforward parameter determines whether or not the system forwards IPV4 source-routed packets. The ipsrcrouteforward will be set to 0, to prevent source-routed packets being forwarded by the system. This would prevent a hacker from using source-routed packets to bridge an external facing server to an internal LAN, possibly even through a firewall. Audit: `no -o ipsrcrouteforward` must report 0.

How it is checked

Audit method: Shell command

shell

command -v no >/dev/null 2>&1 || exit 1; out=$(no -o ipsrcrouteforward 2>/dev/null) || exit 1; printf '%s\n' "$out" | sed 's/[[:blank:]]*=[[:blank:]]*/=/'

Expected output: ipsrcrouteforward=0

How it is fixed

Fix method: Guidance or infrastructure patch

no -p -o ipsrcrouteforward=0 (sets the running value and makes it persistent in /etc/tunables/nextboot)

Properties

Operating systems: Any
Tags: aixnetwork
Reference: CIS IBM AIX 7 Benchmark v1.2.0 - 4.5.10 Ensure ipsrcrouteforward is disabled

Check this host

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

shell

tmaegis scan --target aix