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The Ubuntu operating system must not allow users to override SSH environment variables.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-215127 | UBTU-16-030251 | SV-215127r610931_rule | Medium |
| Description |
|---|
| Failure to restrict system access to authenticated users negatively impacts Ubuntu operating system security. |
| STIG | Date |
|---|---|
| Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide | 2020-12-09 |
Details
| Check Text ( C-16326r285249_chk ) |
|---|
| Verify the operating system does not allow users to override environment variables to the SSH daemon. Check for the value of the "PermitUserEnvironment" keyword with the following command: # grep -i permituserenvironment /etc/ssh/sshd_config PermitUserEnvironment no If the "PermitUserEnvironment" keyword is not set to "no", is missing, or is commented out, this is a finding. |
| Fix Text (F-16324r285250_fix) |
|---|
| Configure the operating system to not allow users to override environment variables to the SSH daemon. Edit the "/etc/ssh/sshd_config" file to uncomment or add the line for "PermitUserEnvironment" keyword and set the value to "no": PermitUserEnvironment no The SSH service must be restarted for changes to take effect: # sudo systemctl restart sshd.service |