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The SUSE operating system must not send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects.


Overview

Finding ID Version Rule ID IA Controls Severity
V-217295 SLES-12-030420 SV-217295r603262_rule Medium
Description
ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly revealing portions of the network topology.
STIG Date
SLES 12 Security Technical Implementation Guide 2022-12-06

Details

Check Text ( C-18523r370041_chk )
Verify the SUSE operating system does not send IPv4 ICMP redirect messages.

Check the value of the "all send_redirects" variables with the following command:

# sysctl net.ipv4.conf.all.send_redirects
net.ipv4.conf.all.send_redirects =0

If the returned line does not have a value of "0” this is a finding.
Fix Text (F-18521r370042_fix)
Configure the SUSE operating system to not allow interfaces to perform IPv4 ICMP redirects.

Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value):

net.ipv4.conf.all.send_redirects=0

Run the following command to apply this value:

# sysctl --system