STIGQter: STIG Summary: IBM z/OS TSS Security Technical Implementation Guide Version: 8 Release: 2 Benchmark Date: 23 Apr 2021:

IBM z/OS Operating system commands (MVS.) of the OPERCMDS resource class must be properly owned.

DISA Rule

SV-223921r561402_rule

Vulnerability Number

V-223921

Group Title

SRG-OS-000080-GPOS-00048

Rule Version

TSS0-ES-000480

Severity

CAT II

CCI(s)

• CCI-000213 - The information system enforces approved authorizations for logical access to information and system resources in accordance with applicable access control policies.

Weight

10

Fix Recommendation

z/OS system command controls are provided via resources in the OPERCMDS resource class. Configure (MVS) of the OPERCMDS resource class to be properly owned or at a minimum the OPERCMDS resource in the RDT specifies the DEFPROT attribute. Name the actual owning ACID specified for deptacid in accordance with installation recommendations.

When protecting the facilities for z/OS system commands via the OPERCMDS class, use the following controls:

(1) Prevent access to the z/OS resources by default, and log all access. Create generic and specific permissions with logging as required using the required controls for z/OS System Commands listed in ACP00282.

For example:

TSS ADDTO(deptacid) OPERCMDS(MVS.)
TSS PERMIT(usracid) OPERCMDS(MVS.ACTIVATE) ACTION(AUDIT)
TSS PERMIT(usracid) OPERCMDS(MVS.CANCEL.JOB.) ACTION(AUDIT)
TSS PERMIT(usracid) OPERCMDS(MVS.CONTROL.) ACCESS(UPDATE)
ACTION(AUDIT)
TSS PERMIT(usracid) OPERCMDS(MVS.DISPLAY.) ACCESS(READ)
TSS PERMIT(usracid) OPERCMDS(MVS.MONITOR) ACCESS(READ)
TSS PERMIT(usracid) OPERCMDS(MVS.STOPMN) ACCESS(READ)

Check Contents

From the ISPF Command Shell enter:
TSS WHOOWNS OPERCMDS(MVS)

If the (MVS) resource is owned, this is not a finding.

If the (MVS) resource is not owned, this is a finding.

TSS LIST RDT RESCLASS(OPERCMDS)

If the (MVS) resource is not OWNED and the OPERCMDS class does not have DEFPROT as an attribute, this is a finding.

Vulnerability Number

V-223921

Documentable

False

Rule Version

TSS0-ES-000480

Severity Override Guidance

From the ISPF Command Shell enter:
TSS WHOOWNS OPERCMDS(MVS)

If the (MVS) resource is owned, this is not a finding.

If the (MVS) resource is not owned, this is a finding.

TSS LIST RDT RESCLASS(OPERCMDS)

If the (MVS) resource is not OWNED and the OPERCMDS class does not have DEFPROT as an attribute, this is a finding.

Check Content Reference

M

Target Key

4102

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