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The Oracle Linux operating system must not allow users to override SSH environment variables.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-221696 | OL07-00-010460 | SV-221696r877377_rule | Medium |
| Description |
|---|
| Failure to restrict system access to authenticated users negatively impacts operating system security. |
| STIG | Date |
|---|---|
| Oracle Linux 7 Security Technical Implementation Guide | 2023-03-06 |
Details
| Check Text ( C-23411r419160_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-23400r419161_fix) |
|---|
| Configure the operating system not to 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. |