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

From Apple OS X 10.12 Security Technical Implementation Guide

Part of SRG-OS-000480-GPOS-00227

Associated with: CCI-000366

SV-90833r1_rule The OS X system must prevent local applications from generating source-routed packets.

Vulnerability discussion

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.

Check content

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

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

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