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The RHEL 8 SSH daemon must not allow Kerberos authentication, except to fulfill documented and validated mission requirements.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-230291 | RHEL-08-010521 | SV-230291r743957_rule | Medium |
| Description |
|---|
| Configuring these settings for the SSH daemon provides additional assurance that remote logon via SSH will not use unused methods of authentication, even in the event of misconfiguration elsewhere. |
| STIG | Date |
|---|---|
| Red Hat Enterprise Linux 8 Security Technical Implementation Guide | 2021-06-14 |
Details
| Check Text ( C-32960r743955_chk ) |
|---|
| Verify the SSH daemon does not allow Kerberos authentication with the following command: $ sudo grep -i KerberosAuthentication /etc/ssh/sshd_config KerberosAuthentication 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 ISSO, this is a finding. |
| Fix Text (F-32935r743956_fix) |
|---|
| Configure the SSH daemon to not allow Kerberos authentication. Add the following line in "/etc/ssh/sshd_config", or uncomment the line and set the value to "no": KerberosAuthentication 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 |