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The SSH daemon must use privilege separation.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-215135 | UBTU-16-030340 | SV-215135r610931_rule | Medium |
| Description |
|---|
| SSH daemon privilege separation causes the SSH process to drop root privileges when not needed, which would decrease the impact of software vulnerabilities in the unprivileged section. |
| STIG | Date |
|---|---|
| Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide | 2020-12-09 |
Details
| Check Text ( C-16334r285273_chk ) |
|---|
| Check that the SSH daemon performs privilege separation with the following command: # grep UsePrivilegeSeparation /etc/ssh/sshd_config UsePrivilegeSeparation yes If the "UsePrivilegeSeparation" keyword is set to "no", is missing, or the returned line is commented out, this is a finding. |
| Fix Text (F-16332r285274_fix) |
|---|
| Configure SSH to use privilege separation. Uncomment the "UsePrivilegeSeparation" keyword in "/etc/ssh/sshd_config" and set the value to "yes": UsePrivilegeSeparation yes 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 |