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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-223930	TSS0-ES-000570	SV-223930r561402_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.

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 TSS Security Technical Implementation Guide	2020-10-07

Details

Check Text ( C-25603r516189_chk )
Refer to the table of Sensitive Utilities resources and/or generic equivalent as detail in the table below. If the TSS resource access authorizations for the following sensitive utilities restrict access to the appropriate personnel, 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. If the TSS resources are owned or DEFPROT is specified for the resource class, this is not a finding. If the TSS resource logging is correctly specified, this is not a finding.

Check Text ( C-25603r516189_chk )

Refer to the table of Sensitive Utilities resources and/or generic equivalent as detail in the table below.

If the TSS resource access authorizations for the following sensitive utilities restrict access to the appropriate personnel, 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.

If the TSS resources are owned or DEFPROT is specified for the resource class, this is not a finding.

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

Fix Text (F-25591r516190_fix)
Ensure that the following are properly specified in the ACP. Note: The resources, and/or resource prefixes identified below are examples of a possible installation. The actual resource type, resources, and/or resource prefixes are determined when the product is actually installed on a system through the product’s installation guide and can be site specific. Ensure that all Sensitive Utility Controls resources and/or generic equivalent are properly protected according to the requirements specified in Sensitive Utility Controls table below. This table lists the resources, access requirements, and logging requirements for Sensitive Utilities, ensures the following guidelines are followed: 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. The TSS resources as designated in the above table are owned and/or DEFPROT is specified for the resource class. The TSS resource access authorizations restrict access to the appropriate personnel as designated in the above table. The following commands are provided as a sample for implementing resource controls: TSS ADD(dept-acid) PROGRAM(AHLGTF) TSS PERMIT(stcgsmpl) PROGRAM(AHLGTF) ACTION(AUDIT)

Fix Text (F-25591r516190_fix)

Ensure that the following are properly specified in the ACP.

Note: The resources, and/or resource prefixes identified below are examples of a possible installation. The actual resource type, resources, and/or resource prefixes are determined when the product is actually installed on a system through the product’s installation guide and can be site specific.

Ensure that all Sensitive Utility Controls resources and/or generic equivalent are properly protected according to the requirements specified in Sensitive Utility Controls table below. This table lists the resources, access requirements, and logging requirements for Sensitive Utilities, ensures the following guidelines are followed:

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.

The TSS resources as designated in the above table are owned and/or DEFPROT is specified for the resource class.

The TSS resource access authorizations restrict access to the appropriate personnel as designated in the above table.

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

TSS ADD(dept-acid) PROGRAM(AHLGTF)
TSS PERMIT(stcgsmpl) PROGRAM(AHLGTF) ACTION(AUDIT)