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The system must ignore IPv4 ICMP redirect messages.


Overview

Finding ID Version Rule ID IA Controls Severity
V-59743 AOSX-10-001200 SV-74173r1_rule Medium
Description
ICMP redirects are broadcast in order to reshape network traffic. A malicious user could craft fake redirect packets and try to force all network traffic to pass through a network sniffer. If the system is not configured to ignore these packets, it could be susceptible to this kind of attack.
STIG Date
Apple OS X 10.10 (Yosemite) Workstation Security Technical Implementation Guide 2017-04-06

Details

Check Text ( C-60513r1_chk )
To check if the system is configured to ignore ICMP redirect messages, run the following command:

sysctl net.inet.icmp.drop_redirect

If the value is not '1', this is a finding.
Fix Text (F-65153r1_fix)
To configure the system to ignore ICMP redirect messages, add the following line to /etc/sysctl.conf:

net.inet.icmp.drop_redirect=1