The system must not accept source-routed IPv4 packets.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22414	GEN003607 M6	SV-38203r1_rule	ECSC-1	Medium

Description
Source-routed packets allow the source of the packet to suggest routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the handling of source-routed traffic destined to the system itself, not to traffic forwarded by the system to another, such as when IPv4 forwarding is enabled and the system is functioning as a router.

Description

Source-routed packets allow the source of the packet to suggest routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the handling of source-routed traffic destined to the system itself, not to traffic forwarded by the system to another, such as when IPv4 forwarding is enabled and the system is functioning as a router.

STIG	Date
MAC OSX 10.6 Workstation Security Technical Implementation Guide	2013-04-09

Details

Check Text ( C-37660r1_chk )
Open a terminal session and enter the following command to view the value of "net.inet.ip.accept_sourceroute". sysctl -a \| grep net.inet.ip.accept_sourceroute If the value of "net.inet.ip.accept_sourceroute" is not set to "0", this is a finding.

Fix Text (F-32901r1_fix)
Open a terminal session and edit the /etc/sysctl.conf file and add the following line. net.inet.ip.accept_sourceroute=0 NOTE: If the sysctl.conf file does not exist use the following command to create one. touch /etc/sysctl.conf