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

IBM Integrated Crypto Service Facility (ICSF) STC data sets must be properly protected.

DISA Rule

SV-255939r991560_rule

Vulnerability Number

V-255939

Group Title

SRG-OS-000259-GPOS-00100

Rule Version

RACF-IC-000030

Severity

CAT II

CCI(s)

• CCI-001499 - Limit privileges to change software resident within software libraries.

Weight

10

Fix Recommendation

Ensure that WRITE and/or greater access to IBM Integrated Crypto Service Facility (ICSF) STC and/or batch data sets are limited to system programmers and ICSF STC and/or batch jobs only. READ access can be given to auditors at the ISSOs discretion.

The installing Systems Programmer will identify and document the product data sets and categorize them according to who will have what type of access and if required, which type of access is logged. The installing systems programmer will identify any additional groups requiring access to specific data sets, and once documented the installing systems programmer will work with the ISSO to confirm that they are properly restricted to the ACP (Access Control Program) active on the system.

(Note: The data sets and/or data set prefixes identified below are examples of a possible installation. The actual data sets and/or prefixes are determined when the product is actually installed on a system through the product's installation guide and can be site specific.)

The data sets to be protected are identified in the data set referenced in the CSFPARM DD statement of the ICSF started task(s) and/or batch job(s); the entries for CKDSN and PKDSN specify the data sets.

Note: Currently on most CSD systems, the CKDSN specifies SYS3.CSF.CKDS, and PKDSN specifies SYS3.CSF.PKDS.

The following commands are provided as a sample for implementing data set controls:

ad 'sys3.csf.**' uacc(none) owner(sys3) -
audit(failures(read)) -
data('ICSF Output Data')
pe 'sys3.csf.**' id(syspaudt) acc(a)
pe 'sys3.csf.**' id(tstcaudt) acc(a)
pe 'sys3.csf.**' id(icsfstc) acc(a)
pe 'sys3.csf.**' id(audtaudt) acc(r)

Check Contents

Verify that access to the IBM Integrated Crypto Service Facility (ICSF) STC data sets are properly restricted. The data sets to be protected are identified in the data set referenced in the CSFPARM DD statement of the ICSF started task(s) and/or batch job(s); the entries for CKDSN and PKDSN specify the data sets.

If the RACF data set access authorizations do not restrict READ access to auditors, this is a finding

If the RACF data set access authorizations do not restrict WRITE and/or greater access to systems programming personnel, this is a finding.

If the RACF data set access authorizations do not restrict WRITE and/or greater access to the product STC(s) and/or batch job(s), this is a finding.

Vulnerability Number

V-255939

Documentable

False

Rule Version

RACF-IC-000030

Severity Override Guidance

Verify that access to the IBM Integrated Crypto Service Facility (ICSF) STC data sets are properly restricted. The data sets to be protected are identified in the data set referenced in the CSFPARM DD statement of the ICSF started task(s) and/or batch job(s); the entries for CKDSN and PKDSN specify the data sets.

If the RACF data set access authorizations do not restrict READ access to auditors, this is a finding

If the RACF data set access authorizations do not restrict WRITE and/or greater access to systems programming personnel, this is a finding.

If the RACF data set access authorizations do not restrict WRITE and/or greater access to the product STC(s) and/or batch job(s), this is a finding.

Check Content Reference

M

Target Key

4101