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RHEL 9 SSH private host key files must have mode 0640 or less permissive.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-258000 | RHEL-09-255120 | SV-258000r991589_rule | Medium |
| Description |
|---|
| If an unauthorized user obtains the private SSH host key file, the host could be impersonated. |
| STIG | Date |
|---|---|
| Red Hat Enterprise Linux 9 Security Technical Implementation Guide | 2024-06-04 |
Details
| Check Text ( C-61741r925985_chk ) |
|---|
| Verify the SSH private host key files have a mode of "0640" or less permissive with the following command: $ ls -l /etc/ssh/*_key 640 /etc/ssh/ssh_host_dsa_key 640 /etc/ssh/ssh_host_ecdsa_key 640 /etc/ssh/ssh_host_ed25519_key 640 /etc/ssh/ssh_host_rsa_key If any private host key file has a mode more permissive than "0640", this is a finding. |
| Fix Text (F-61665r925986_fix) |
|---|
| Configure the mode of SSH private host key files under "/etc/ssh" to "0640" with the following command: $ sudo chmod 0640 /etc/ssh/ssh_host*key Restart the SSH daemon for the changes to take effect: $ sudo systemctl restart sshd.service |