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IP forwarding for IPv4 must not be enabled, unless the system is a router.


Overview

Finding ID Version Rule ID IA Controls Severity
V-12023 GEN005600 M6 SV-38186r1_rule ECSC-1 Medium
Description
If the system is configured for IP forwarding and is not a designated router, it could be used to bypass network security by providing a path for communication not filtered by network devices.
STIG Date
MAC OSX 10.6 Workstation Security Technical Implementation Guide Draft 2013-01-10

Details

Check Text ( C-37606r1_chk )
Open a terminal session and enter the following command.

sysctl -a | grep net.inet.ip.fw.enable

If the value of "net.inet.ip.fw.enable" is not set to "0", this is a finding.
Fix Text (F-32848r1_fix)
Open a terminal session and edit the /etc/sysctl.conf file and add the following line.

net.inet.ip.fw.enable=0

NOTE: If the sysctl.conf file does not exist use the following command to create one.
touch /etc/sysctl.conf