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The system must not send IPv6 ICMP redirects by default.


Overview

Finding ID Version Rule ID IA Controls Severity
V-59751 AOSX-10-001211 SV-74181r1_rule Medium
Description
ICMP redirects are broadcast in order 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 10.10 (Yosemite) Workstation Security Technical Implementation Guide 2017-04-06

Details

Check Text ( C-60521r1_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-65161r2_fix)
To configure the system to not send ICMP redirects, add the following line to /etc/sysctl.conf:

net.inet6.ip6.redirect=0