The TOSS SSH daemon must not allow Kerberos authentication, except to fulfill documented and validated mission requirements.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-252944 | SRG-OS-000480-GPOS-00227 | TOSS-04-010420 | SV-252944r991589_rule | 2024-05-30 | 2 |
| 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. |
| ℹ️ Check |
|---|
| 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 |
|---|
| 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 |