The SUSE operating system SSH daemon must be configured to not allow authentication using known hosts authentication.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-235007	SLES-15-040230	SV-235007r991589_rule		Medium

Description
Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.

STIG	Date
SUSE Linux Enterprise Server 15 Security Technical Implementation Guide	2024-05-30

Details

Check Text ( C-38195r951641_chk )
Verify the SUSE operating system SSH daemon is configured to not allow authentication using "known hosts" authentication. To determine how the SSH daemon's "IgnoreUserKnownHosts" option is set, run the following command: > sudo /usr/sbin/sshd -dd 2>&1 \| awk '/filename/ {print $4}' \| tr -d '\r' \| tr '\n' ' ' \| xargs sudo grep -iH '^\s*ignoreuserknownhosts' IgnoreUserKnownHosts yes If the value is returned as "no", the returned line is commented out, or no output is returned, this is a finding.

Check Text ( C-38195r951641_chk )

Verify the SUSE operating system SSH daemon is configured to not allow authentication using "known hosts" authentication.

To determine how the SSH daemon's "IgnoreUserKnownHosts" option is set, run the following command:

> sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*ignoreuserknownhosts'

IgnoreUserKnownHosts yes

If the value is returned as "no", the returned line is commented out, or no output is returned, this is a finding.

Fix Text (F-38158r619291_fix)
Configure the SUSE operating system SSH daemon to not allow authentication using "known hosts" authentication. Add the following line in "/etc/ssh/sshd_config", or uncomment the line and set the value to "yes": IgnoreUserKnownHosts yes