The macOS system must prevent local applications from generating source-routed packets.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-214915	AOSX-13-001215	SV-214915r609363_rule		Medium

Description
A source-routed packet attempts to specify the network path that the system should take. If the system is not configured to block the sending of source-routed packets, an attacker can redirect the system's network traffic.

STIG	Date
Apple OS X 10.13 Security Technical Implementation Guide	2021-11-19

Details

Check Text ( C-16115r397317_chk )
To check if the system is configured to forward source-routed packets, run the following command: sysctl net.inet.ip.sourceroute If the value is not set to "0", this is a finding.

Fix Text (F-16113r397318_fix)
To configure the system to not forward source-routed packets, add the following line to "/etc/sysctl.conf", creating the file if necessary: net.inet.ip.sourceroute=0