IBM z/OS MCS consoles access authorization(s) for CONSOLE resource(s) must be properly protected.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-223919	TSS0-ES-000460	SV-223919r877760_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. Satisfies: SRG-OS-000080-GPOS-00048, SRG-OS-000324-GPOS-00125

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. Satisfies: SRG-OS-000080-GPOS-00048, SRG-OS-000324-GPOS-00125

STIG	Date
IBM z/OS TSS Security Technical Implementation Guide	2022-12-14

Details

Check Text ( C-25592r811046_chk )
From the ISPF Command Shell enter: TSS WHOOWNS SYSCONS(*) For each Console defined enter: TSS WHOHAS SYSCONS() If the ACID associated with each console has READ access to the corresponding resource defined in the SYSCONS resource class, this is not a finding. If access authorization for SYSCONS resources restricts access to operations, the Master SCA, system programming personnel, or authorized personnel, this is not a finding. If the console defined is not defined to the TSS SYSCONS resource class enter: TSS LIST (RDT) RESCLASS(SYSCONS) If the SYSCONS resource class does not have the DEPROT attribute, this is a finding. For each Console defined enter: TSS WHOHAS() If the console defined is not defined to the TSS SYSCONS resource class enter: TSS LIST (RDT) RESCLASS(SYSCONS) If the SYSCONS resource class does not have the DEPROT attribute, this is a finding.

Check Text ( C-25592r811046_chk )

From the ISPF Command Shell enter:
TSS WHOOWNS SYSCONS(*)

For each Console defined enter:
TSS WHOHAS SYSCONS()

If the ACID associated with each console has READ access to the corresponding resource defined in the SYSCONS resource class, this is not a finding.

If access authorization for SYSCONS resources restricts access to operations, the Master SCA, system programming personnel, or authorized personnel, this is not a finding.

If the console defined is not defined to the TSS SYSCONS resource class enter:
TSS LIST (RDT) RESCLASS(SYSCONS)

If the SYSCONS resource class does not have the DEPROT attribute, this is a finding.

For each Console defined enter:
TSS WHOHAS()

If the console defined is not defined to the TSS SYSCONS resource class enter:
TSS LIST (RDT) RESCLASS(SYSCONS)

If the SYSCONS resource class does not have the DEPROT attribute, this is a finding.

Fix Text (F-25580r811047_fix)
Ensure that all MCS consoles are defined to the SYSCONS resource class and READ access is limited to operators, and system programmers, or authorized personnel. Review the MCS console resources defined to z/OS and the ACP and ensure they conform to those outlined below. Each console defined in the CONSOLxx parmlib members is defined to TSS SYSCONS resource class and/or the SYSCONS resource class has the DEFPROT attribute. Example: TSS REPLACE(RDT) RESCLASS(SYSCONS) ATTR(DEFPROT) The ACID associated with each console has access to the corresponding resource defined in the SYSCONS resource class. Example: TSS PERMIT(MMGMST) SYSCONS(MMGMST) ACCESS(READ) Access authorization for SYSCONS resources restricts access to operations, the Master SCA, and system programming personnel. TSS PERMIT(opersmpl) SYSCONS(MMGMST) ACCESS(READ) TSS PERMIT(Master SCA) SYSCONS(MMGMST) ACCESS(READ) TSS PERMIT(syspsmpl) SYSCONS(MMGMST) ACCESS(READ)

Fix Text (F-25580r811047_fix)

Ensure that all MCS consoles are defined to the SYSCONS resource class and READ access is limited to operators, and system programmers, or authorized personnel.

Review the MCS console resources defined to z/OS and the ACP and ensure they conform to those outlined below.

Each console defined in the CONSOLxx parmlib members is defined to TSS SYSCONS resource class and/or the SYSCONS resource class has the DEFPROT attribute.

Example:

TSS REPLACE(RDT) RESCLASS(SYSCONS) ATTR(DEFPROT)

The ACID associated with each console has access to the corresponding resource defined in the SYSCONS resource class.

Example:

TSS PERMIT(MMGMST) SYSCONS(MMGMST) ACCESS(READ)

Access authorization for SYSCONS resources restricts access to operations, the Master SCA, and system programming personnel.

TSS PERMIT(opersmpl) SYSCONS(MMGMST) ACCESS(READ)
TSS PERMIT(Master SCA) SYSCONS(MMGMST) ACCESS(READ)
TSS PERMIT(syspsmpl) SYSCONS(MMGMST) ACCESS(READ)