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-221696r991591_rule | CCI-000366 | medium |
| Description | ||||
| Failure to restrict system access to authenticated users negatively impacts operating system security. | ||||
| STIG | Date | |||
| Oracle Linux 7 Security Technical Implementation Guide | 2025-05-08 | |||
Details
Check Text (C-221696r991591_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.