STIGQter: STIG Summary: IBM z/OS ACF2 Security Technical Implementation Guide Version: 9 Release: 9 Benchmark Date: 01 Jul 2026:

IBM z/OS SYS1.PARMLIB must be properly protected.

DISA Rule

SV-223463r1225693_rule

Vulnerability Number

V-223463

Group Title

SRG-OS-000063-GPOS-00032

Rule Version

ACF2-ES-000440

Severity

CAT I

CCI(s)

• CCI-000171 - Allow organization-defined personnel or roles to select the event types that are to be logged by specific components of the system.
• CCI-000213 - Enforce approved authorizations for logical access to information and system resources in accordance with applicable access control policies.
• CCI-001499 - Limit privileges to change software resident within software libraries.
• CCI-003980 - Allow user installation of software only with explicit privileged status.
• CCI-001914 - Provide the capability for organization-defined individuals or roles to change the logging to be performed on organization-defined system components based on organization-defined selectable event criteria within organization-defined time thresholds.
• CCI-002235 - Prevent non-privileged users from executing privileged functions.

Weight

10

Fix Recommendation

Configure access rules for SYS1.PARMLIB concatenation as follows:

Systems programming personnel will be authorized to update and alter the SYS1.PARMLIB concatenation.
Domain-level security administrators can be authorized to update the SYS1.PARMLIB concatenation.
System-Level Started Tasks, authorized Data Center personnel, and auditor can be authorized read access by the information system security officer (ISSO).
All update and alter access is logged.

Check Contents

Execute a data set list of access to SYS1.PARMLIB concatenation.

If the ESM data set rules for SYS1.PARMLIB allow inappropriate (e.g., global READ) access, this is a finding.

If data set rules for SYS1.PARMLIB do not restrict READ, UPDATE, and ALTER access to only systems programming personnel, this is a finding.

If data set rules for SYS1.PARMLIB do not restrict READ and UPDATE access to only domain-level security administrators, this is a finding.

If data set rules for SYS1.PARMLIB do not restrict READ access to only System-Level Started Tasks, authorized Data Center personnel, and auditors, this is a finding.

If data set rules for SYS1.PARMLIB do not specify that all (i.e., failures and successes) UPDATE and/or ALTER access will be logged, this is a finding.

Vulnerability Number

V-223463

Documentable

False

Rule Version

ACF2-ES-000440

Severity Override Guidance

Execute a data set list of access to SYS1.PARMLIB concatenation.

If the ESM data set rules for SYS1.PARMLIB allow inappropriate (e.g., global READ) access, this is a finding.

If data set rules for SYS1.PARMLIB do not restrict READ, UPDATE, and ALTER access to only systems programming personnel, this is a finding.

If data set rules for SYS1.PARMLIB do not restrict READ and UPDATE access to only domain-level security administrators, this is a finding.

If data set rules for SYS1.PARMLIB do not restrict READ access to only System-Level Started Tasks, authorized Data Center personnel, and auditors, this is a finding.

If data set rules for SYS1.PARMLIB do not specify that all (i.e., failures and successes) UPDATE and/or ALTER access will be logged, this is a finding.

Check Content Reference

M

Target Key

4100