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The OS X system must not send IPv6 ICMP redirects by default.


Overview

Finding ID Version Rule ID IA Controls Severity
V-76143 AOSX-12-001211 SV-90831r1_rule Medium
Description
ICMP redirects are broadcast to reshape network traffic. A malicious user could use the system to send fake redirect packets and try to force all network traffic to pass through a network sniffer. Disabling ICMP redirect broadcasts mitigates this risk.
STIG Date
Apple OS X 10.12 Security Technical Implementation Guide 2018-12-24

Details

Check Text ( C-75829r1_chk )
To check if the system is configured to send ICMP redirects, run the following command:

sysctl net.inet6.ip6.redirect

If the values are not set to "0", this is a finding.
Fix Text (F-82781r1_fix)
To configure the system to not send ICMP redirects, add the following line to "/etc/sysctl.conf", creating the file if necessary:

net.inet6.ip6.redirect=0