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The OL 8 SSH private host key files must have mode "0640" or less permissive.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-248602 | OL08-00-010490 | SV-248602r880541_rule | Medium |
| Description |
|---|
| If an unauthorized user obtains the private SSH host key file, the host could be impersonated. |
| STIG | Date |
|---|---|
| Oracle Linux 8 Security Technical Implementation Guide | 2023-06-02 |
Details
| Check Text ( C-52036r880539_chk ) |
|---|
| Verify the SSH private host key files have mode "0640" or less permissive with the following command: $ sudo ls -alL /etc/ssh/ssh_host*key -rw-r----- 1 root wheel 668 Nov 28 06:43 ssh_host_dsa_key -rw-r----- 1 root wheel 582 Nov 28 06:43 ssh_host_key -rw-r----- 1 root wheel 887 Nov 28 06:43 ssh_host_rsa_key If any private host key file has a mode more permissive than "0640", this is a finding. |
| Fix Text (F-51990r880540_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 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 |