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

IBM Integrated Crypto Service Facility (ICSF) install data sets are not properly protected.

DISA Rule

SV-255941r1137691_rule

Vulnerability Number

V-255941

Group Title

SRG-OS-000080-GPOS-00048

Rule Version

TSS0-IC-000020

Severity

CAT II

CCI(s)

• CCI-000213 - Enforce approved authorizations for logical access to information and system resources in accordance with applicable access control policies.
• CCI-002264 - Provides the means to associate organization-defined types of security attributes having organization-defined security attribute values with information in transmission.

Weight

10

Fix Recommendation

Ensure that update and allocate access to IBM Integrated Crypto Service Facility (ICSF) install data sets is limited to System Programmers only, and all update and allocate access is logged. Read access can be given to Auditors and any other users that have a valid requirement to utilize these data sets.

The installing Systems Programmer will identify and document the product data sets and categorize them according to who will have update and alter access and if required that all update and allocate access is logged. He will identify if any additional groups have update access for specific data sets, and once documented he will work with the IAO to see that they are properly restricted to the ACP (Access Control Program) active on the system.

Data sets to be protected will be:
SYS1.CSF

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

TSS PERMIT(syspaudt) DSN(SYS1.CSF.) ACCESS(R)
TSS PERMIT(tstcaudt) DSN(SYS1.CSF.) ACCESS(R)
TSS PERMIT(icsfusrs) DSN(SYS1.CSF.) ACCESS(R)
TSS PERMIT(syspaudt) DSN(SYS1.CSF.) ACCESS(ALL) ACTION(AUDIT)
TSS PERMIT(tstcaudt) DSN(SYS1.CSF.) ACCESS(ALL) ACTION(AUDIT)

Check Contents

Verify that access to the IBM IntegrTated Crypto Service Facility (ICSF) install data sets are properly restricted.

Execute a data set list of access to the IBM Integrated Crypto Service Facility (ICSF) install data sets

If the TSS data set rules for the data sets does not restrict UPDATE and/or ALL access to systems programming personnel this is a finding.

If the TSS data set rules for the data sets does not specify that all (i.e., failures and successes) UPDATE and/or ALL access will be logged this is a finding.

Vulnerability Number

V-255941

Documentable

False

Rule Version

TSS0-IC-000020

Severity Override Guidance

Verify that access to the IBM IntegrTated Crypto Service Facility (ICSF) install data sets are properly restricted.

Execute a data set list of access to the IBM Integrated Crypto Service Facility (ICSF) install data sets

If the TSS data set rules for the data sets does not restrict UPDATE and/or ALL access to systems programming personnel this is a finding.

If the TSS data set rules for the data sets does not specify that all (i.e., failures and successes) UPDATE and/or ALL access will be logged this is a finding.

Check Content Reference

M

Target Key

4102