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IBM z/OS Sensitive Utility Controls must be properly defined and protected.


Overview

Finding ID Version Rule ID IA Controls Severity
V-223428 ACF2-ES-000070 SV-223428r533198_rule Medium
Description
To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DoD-approved PKIs, all DoD systems (e.g., web servers and web portals) must be properly configured to incorporate access control methods that do not rely solely on the possession of a certificate for access. Successful authentication must not automatically give an entity access to an asset or security boundary. Authorization procedures and controls must be implemented to ensure each authenticated entity also has a validated and current authorization. Authorization is the process of determining whether an entity, once authenticated, is permitted to access a specific asset. Information systems use access control policies and enforcement mechanisms to implement this requirement. Access control policies include: identity-based policies, role-based policies, and attribute-based policies. Access enforcement mechanisms include: access control lists, access control matrices, and cryptography. These policies and mechanisms must be employed by the application to control access between users (or processes acting on behalf of users) and objects (e.g., devices, files, records, processes, programs, and domains) in the information system.
STIG Date
IBM z/OS ACF2 Security Technical Implementation Guide 2022-06-22

Details

Check Text ( C-25101r504422_chk )
Refer to the table of Sensitive Utilities resources and/or generic equivalent as detailed in the table.

If the ACF2 resources are defined with a default access of PREVENT, this is not a finding.

If the ACF2 resource access authorizations restrict access to the appropriate personnel according to the site security plan, this not a finding.

If the ACF2 resource logging is correctly specified, this is not a finding.

Sensitive Utility Controls
Program Product Function
AHLGTF z/OS System Activity Tracing
HHLGTF
IHLGTF

ICPIOCP z/OS System Configuration
IOPIOCP
IXPIOCP
IYPIOCP
IZPIOCP

BLSROPTR z/OS Data Management

DEBE OS/DEBE Data Management

DITTO OS/DITTO Data Management

FDRZAPOP FDR Product Internal Modification

GIMSMP SMP/E Change Management Product

ICKDSF z/OS DASD Management

IDCSC01 z/OS IDCAMS Set Cache Module

IEHINITT z/OS Tape Management

IFASMFDP z/OS SMF Data Dump Utility

IND$FILE z/OS PC to Mainframe File Transfer
(Applicable only for classified systems)

CSQJU003 IBM WebSphereMQ
CSQJU004
CSQUCVX
CSQ1LOGP
CSQUTIL

WHOIS z/OS Share MOD to identify user name from USERID.
Restricted to data center personnel only.
Fix Text (F-25089r504423_fix)
Refer to the Site Security plan for Sensitive Programs/Utilities for lists the resources, access requirements, and logging requirements for Sensitive Utilities.

Configure ACF2 resources to be defined with a default access of PREVENT.

Configure ACF2 resource access authorizations to restrict access to the appropriate personnel.

Configure ACF2 resource logging to be correctly specified.

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

$KEY(AHLGTF) TYPE(PGM)
UID(stcg) LOG
UID(*) PREVENT

F ACF2,REBUILD(PGM)