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Remote X connections for interactive users must be encrypted.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-215137 | UBTU-16-030400 | SV-215137r508033_rule | High |
| Description |
|---|
| Open X displays allow an attacker to capture keystrokes and execute commands remotely. |
| STIG | Date |
|---|---|
| Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide | 2020-09-03 |
Details
| Check Text ( C-16336r285279_chk ) |
|---|
| Verify remote X connections for interactive users are encrypted. Check that remote X connections are encrypted with the following command: # grep -i x11forwarding /etc/ssh/sshd_config X11Forwarding yes If the "X11Forwarding" keyword is set to "no", is missing, or is commented out, this is a finding. |
| Fix Text (F-16334r285280_fix) |
|---|
| Configure SSH to encrypt connections for interactive users. Edit the "/etc/ssh/sshd_config" file to uncomment or add the line for the "X11Forwarding" keyword and set its value to "yes": X11Forwarding 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 |