CA-TSS AUTH Control Option values specified must be set to (OVERRIDE,ALLOVER) or (MERGE,ALLOVER).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-223922	TSS0-ES-000490	SV-223922r877763_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	2023-03-20

Details

Check Text ( C-25595r516165_chk )
TSS MODIFY STATUS If the AUTH Control Option values are not set to AUTH(OVERRIDE, ALLOVER) or AUTH(MERGE, ALLOVER), this is a finding.

Fix Text (F-25583r516166_fix)
Configure the AUTH control option is set to (OVERRIDE, ALLOVER) or (MERGE, ALLOVER). With (OVERRIDE, ALLOVER), TSS separately searches first the user, then profiles, and then the ALL record for its access authorization. With (MERGE, ALLOVER), TSS merges and searches the user and all profiles, and then the ALL record for its access authorization. Evaluate the impact associated with implementation of the control option. Develop a plan of action to implement the control option setting to AUTH(OVERRIDE, ALLOVER) or AUTH(MERGE, ALLOVER) and proceed with the change.

Fix Text (F-25583r516166_fix)

Configure the AUTH control option is set to (OVERRIDE, ALLOVER) or (MERGE, ALLOVER). With (OVERRIDE, ALLOVER), TSS separately searches first the user, then profiles, and then the ALL record for its access authorization. With (MERGE, ALLOVER), TSS merges and searches the user and all profiles, and then the ALL record for its access authorization. Evaluate the impact associated with implementation of the control option. Develop a plan of action to implement the control option setting to AUTH(OVERRIDE, ALLOVER) or AUTH(MERGE, ALLOVER) and proceed with the change.