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The OS X system must not accept source-routed IPv4 packets.


Overview

Finding ID Version Rule ID IA Controls Severity
V-76269 AOSX-12-001195 SV-90957r1_rule Medium
Description
A source-routed packet attempts to specify the network path the packet should take. If the system is not configured to block the incoming source-routed packets, an attacker can redirect the system's network traffic. Configuring the system to drop incoming source-routed IPv4 packets mitigates this risk.
STIG Date
Apple OS X 10.12 Security Technical Implementation Guide 2018-12-24

Details

Check Text ( C-75955r1_chk )
To check if the system is configured to accept "source-routed" packets, run the following command:

sysctl net.inet.ip.accept_sourceroute

If the value is not "0", this is a finding.
Fix Text (F-82905r1_fix)
To configure the system to not accept "source-routed" packets, add the following line to "/etc/sysctl.conf", creating the file if necessary:

net.inet.ip.accept_sourceroute=0