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The system must not send IPv4 ICMP redirects.


Overview

Finding ID Version Rule ID IA Controls Severity
V-22417 GEN003610 M6 SV-38205r1_rule ECSC-1 Medium
Description
ICMP redirect messages are used by routers to inform hosts of a more direct route existing for a particular destination. These messages contain information from the system's route table possibly revealing portions of the network topology.
STIG Date
MAC OSX 10.6 Workstation Security Technical Implementation Guide Draft 2013-01-10

Details

Check Text ( C-37662r1_chk )
Open a terminal session and enter the following command to view the value of "net.inet.ip.redirect".

sysctl -a | grep net.inet.ip.redirect

If the value of "net.inet.ip.redirect" is not set to "0", this is a finding.
Fix Text (F-32903r1_fix)
Open a terminal session and edit the /etc/sysctl.conf file and add the following line.

net.inet.ip.redirect=0

NOTE: If the sysctl.conf file does not exist use the following command to create one.
touch /etc/sysctl.conf