IBM z/OS Default profiles must not be defined in TSS OMVS UNIX security parameters for classified systems.

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 DoW that reflects the most restrictive security posture consistent with operational requirements.

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.

Ensure that Use of the OMVS default UIDs will not be allowed on any classified system.

Set Control Option UNIQUSER off.