IBM z/OS TSOAUTH resources must be restricted to authorized users.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-223615	ACF2-TS-000010	SV-223615r533198_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 ACF2 Security Technical Implementation Guide	2021-03-29

Details

Check Text ( C-25288r504806_chk )
From the ISPF Command Shell enter: ACF SET RESOURCE(TSO) SET VERBOSE LIST LIKE(-) If the ACCT authorization is restricted to security personnel, this is not a finding. If the CONSOLE authorization is restricted to authorized systems personnel (e.g., systems programming personnel, operations staff, etc) and READ access may be given to all user when SDSF in install at the ISSOs discretion, this is not a finding. If the MOUNT authorization is restricted to DASD batch users only, this is not a finding. If the OPER authorization is restricted to authorized systems personnel (e.g., systems programming personnel, operations staff, etc), this is not a finding. If the PARMLIB authorization is restricted to only z/OS systems programming personnel and READ access may be given to auditors, this is not a finding. If the TESTAUTH authorization is restricted to only z/OS systems programming personnel, this is not a finding.

Check Text ( C-25288r504806_chk )

From the ISPF Command Shell enter:
ACF
SET RESOURCE(TSO)
SET VERBOSE
LIST LIKE(-)

If the ACCT authorization is restricted to security personnel, this is not a finding.

If the CONSOLE authorization is restricted to authorized systems personnel (e.g., systems programming personnel, operations staff, etc) and READ access may be given to all user when SDSF in install at the ISSOs discretion, this is not a finding.

If the MOUNT authorization is restricted to DASD batch users only, this is not a finding.

If the OPER authorization is restricted to authorized systems personnel (e.g., systems programming personnel, operations staff, etc), this is not a finding.

If the PARMLIB authorization is restricted to only z/OS systems programming personnel and READ access may be given to auditors, this is not a finding.

If the TESTAUTH authorization is restricted to only z/OS systems programming personnel, this is not a finding.

Fix Text (F-25276r504807_fix)
Configure the TSOAUTH resource class to control sensitive TSO/E commands. (Note: The resource type, 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.) Below is listed the access requirements for TSOAUTH resources. Ensure the guidelines for the resources and/or generic equivalent are followed. The ACCT authorization is restricted to security personnel. The CONSOLE authorization is restricted to authorized systems personnel (e.g., systems programming personnel, operations staff, etc) and READ access may be given to all user when SDSF in install at the ISSOs discretion. The MOUNT authorization is restricted to DASD batch users only. The OPER authorization is restricted to authorized systems personnel (e.g., systems programming personnel, operations staff, etc). The PARMLIB authorization is restricted to only z/OS systems programming personnel and READ access may be given to audit users. The TESTAUTH authorization is restricted to only z/OS systems programming personnel.

Fix Text (F-25276r504807_fix)

Configure the TSOAUTH resource class to control sensitive TSO/E commands.

(Note: The resource type, 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.)

Below is listed the access requirements for TSOAUTH resources. Ensure the guidelines for the resources and/or generic equivalent are followed.

The ACCT authorization is restricted to security personnel.

The CONSOLE authorization is restricted to authorized systems personnel (e.g., systems programming personnel, operations staff, etc) and READ access may be given to all user when SDSF in install at the ISSOs discretion.

The MOUNT authorization is restricted to DASD batch users only.

The OPER authorization is restricted to authorized systems personnel (e.g., systems programming personnel, operations staff, etc).

The PARMLIB authorization is restricted to only z/OS systems programming personnel and READ access may be given to audit users.

The TESTAUTH authorization is restricted to only z/OS systems programming personnel.