The system must not accept source-routed IPv4 packets.

From MAC OSX 10.6 Workstation Security Technical Implementation Guide

Associated with IA controls: ECSC-1

Associated with: CCI-001551

SV-38203r1_rule The system must not accept source-routed IPv4 packets.

Vulnerability discussion

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.

Check content

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

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

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