SLEM 5 SSH daemon must be configured to not allow authentication using known hosts authentication.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-261340	SLEM-05-255075	SV-261340r996483_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 Micro (SLEM) 5 Security Technical Implementation Guide	2024-06-04

Details

Check Text ( C-65069r996481_chk )
Verify SLEM 5 SSH daemon is configured to not allow authentication using "known hosts" authentication with 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' /etc/ssh/sshd_config:IgnoreUserKnownHosts yes If "IgnoreUserKnownHosts" is not set to "no", is commented out, missing, or conflicting results are returned, this is a finding.

Check Text ( C-65069r996481_chk )

Verify SLEM 5 SSH daemon is configured to not allow authentication using "known hosts" authentication with 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'
/etc/ssh/sshd_config:IgnoreUserKnownHosts yes

If "IgnoreUserKnownHosts" is not set to "no", is commented out, missing, or conflicting results are returned, this is a finding.

Fix Text (F-64977r996482_fix)
Configure SLEM 5 SSH daemon to not allow authentication using "known hosts" authentication. Add or modify the following line in the "/etc/ssh/sshd_config" file: IgnoreUserKnownHosts yes Restart the SSH daemon in order for the changes to take effect: > sudo systemctl restart sshd.service