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V-261340

CAT II (Medium)

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

Rule ID

SV-261340r996483_rule

STIG

SUSE Linux Enterprise Micro (SLEM) 5 Security Technical Implementation Guide

Version

V1R4

CCIs

CCI-000366

Discussion

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.

Check Content

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

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