IBM z/OS Default profiles must not be defined in TSS OMVS UNIX security parameters for classified systems.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-224090 | TSS0-US-000170 | SV-224090r991589_rule | CCI-000366 | medium |
| Description | ||||
| Configuring the operating system to implement organization-wide security implementation guides and security checklists ensures compliance with federal standards and establishes a common security baseline across DoD that reflects the most restrictive security posture consistent with operational requirements. | ||||
| STIG | Date | |||
| IBM z/OS TSS Security Technical Implementation Guide | 2025-06-24 | |||
Details
Check Text (C-224090r991589_chk)
If the system in not classified this is not applicable.
From a command line issue the following command:
TSS MODIFY STATUS
Note: One must have appropriate access to perform this command (have the site security officer to issue command).
If system is classified and UNIQUSER is off i.e., (UNIQUSER(OFF) this is not a finding.
Fix Text (F-25751r516670_fix)
Ensure that Use of the OMVS default UIDs will not be allowed on any classified system.
Set Control Option UNIQUSER off.