IBM z/OS UNIX BPXPRMxx security parameters in PARMLIB must be properly specified.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-223631 | ACF2-US-000160 | SV-223631r991589_rule | CCI-000366 | medium |
| Description | ||||
| Configuration settings are the set of parameters that can be changed in hardware, software, or firmware components of the system that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting the security state of the system, including the parameters required to satisfy other security control requirements. Security-related parameters include, for example: registry settings; account, file, directory permission settings; and settings for functions, ports, protocols, services, and remote connections. | ||||
| STIG | Date | |||
| IBM z/OS ACF2 Security Technical Implementation Guide | 2025-06-24 | |||
Details
Check Text (C-223631r991589_chk)
Refer to the proper BPXPRMxx member in SYS1.PARMLIB.
If the required parameter keywords and values are defined as detailed below, this is not a finding.
Parameter Keyword Value
SUPERUSER BPXROOT
TTYGROUP TTY
STEPLIBLIST /etc/steplib
USERIDALIASTABLE will not be specified.
ROOT SETUID will be specified.
MOUNT NOSETUID
SETUID (for Vendor-provided files)
SECURITY
STARTUP_PROC OMVS
Fix Text (F-25292r864506_fix)
Define the settings in PARMLIB member BPXPRMxx for z/OS UNIX security parameters values to conform to the specifications below:
Parameter Keyword Value
SUPERUSER BPXROOT
TTYGROUP TTY
STEPLIBLIST /etc/steplib
USERIDALIASTABLE will not be specified.
ROOT SETUID will be specified.
MOUNT NOSETUID
SETUID (for Vendor-provided files)
SECURITY
STARTUP_PROC OMVS