The RHEL 8 SSH daemon must not allow GSSAPI authentication, except to fulfill documented and validated mission requirements.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-244528	RHEL-08-010522	SV-244528r952106_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
Red Hat Enterprise Linux 8 Security Technical Implementation Guide	2024-02-19

Details

Check Text ( C-47803r952106_chk )
Verify the SSH daemon does not allow GSSAPI 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*gssapiauthentication' GSSAPIAuthentication no If the value is returned as "yes", the returned line is commented out, no output is returned, or has not been documented with the information system security officer (ISSO), this is a finding. If conflicting results are returned, this is a finding.

Check Text ( C-47803r952106_chk )

Verify the SSH daemon does not allow GSSAPI 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*gssapiauthentication'

GSSAPIAuthentication no

If the value is returned as "yes", the returned line is commented out, no output is returned, or has not been documented with the information system security officer (ISSO), this is a finding.

If conflicting results are returned, this is a finding.

Fix Text (F-47760r743832_fix)
Configure the SSH daemon to not allow GSSAPI authentication. Add the following line in "/etc/ssh/sshd_config", or uncomment the line and set the value to "no": GSSAPIAuthentication no The SSH daemon must be restarted for the changes to take effect. To restart the SSH daemon, run the following command: $ sudo systemctl restart sshd.service