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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-76145	AOSX-12-001215	SV-90833r1_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 10.12 Security Technical Implementation Guide	2018-12-24

Details

Check Text ( C-75831r1_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-82783r1_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