IBM z/OS data sets for the Base TCP/IP component must be properly protected.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-223603	ACF2-TC-000050	SV-223603r533198_rule		Medium

Description
MVS data sets of the Base TCP/IP component provide the configuration, operational, and executable properties of IBMs TCP/IP system product. Failure to properly secure these data sets may lead to unauthorized access resulting in the compromise of the integrity and availability of the operating system environment, ACP, and customer data. 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-000259-GPOS-00100

Description

MVS data sets of the Base TCP/IP component provide the configuration, operational, and executable properties of IBMs TCP/IP system product. Failure to properly secure these data sets may lead to unauthorized access resulting in the compromise of the integrity and availability of the operating system environment, ACP, and customer data. 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-000259-GPOS-00100

STIG	Date
IBM z/OS ACF2 Security Technical Implementation Guide	2021-03-29

Details

Check Text ( C-25276r504773_chk )
If all of the following items are true, this is not a finding. WRITE and ALLOCATE access to product data sets is restricted to systems programming personnel (i.e., SMP/E distribution data sets with the prefix SYS1.TCPIP.AEZA and target data sets with the prefix SYS1.TCPIP.SEZA). WRITE and ALLOCATE access to the data set(s) containing the Data and Profile configuration files is restricted to systems programming personnel. Note: If any INCLUDE statements are specified in the Profile configuration file, the named MVS data sets have the same access authorization requirements. WRITE and ALLOCATE access to the data set(s) containing the Data and Profile configuration files is logged. Note: If any INCLUDE statements are specified in the Profile configuration file, the named MVS data sets have the same logging requirements. WRITE and ALLOCATE access to the data set(s) containing the configuration files shared by TCP/IP applications is restricted to systems programming personnel. Note: For systems running the TSS ACP replace the WRITE and ALLOCATE with WRITE, UPDATE, CREATE, CONTROL, SCRATCH, and ALL.

Check Text ( C-25276r504773_chk )

If all of the following items are true, this is not a finding.

WRITE and ALLOCATE access to product data sets is restricted to systems programming personnel (i.e., SMP/E distribution data sets with the prefix SYS1.TCPIP.AEZA and target data sets with the prefix SYS1.TCPIP.SEZA).

WRITE and ALLOCATE access to the data set(s) containing the Data and Profile configuration files is restricted to systems programming personnel.
Note: If any INCLUDE statements are specified in the Profile configuration file, the named MVS data sets have the same access authorization requirements.

WRITE and ALLOCATE access to the data set(s) containing the Data and Profile configuration files is logged.
Note: If any INCLUDE statements are specified in the Profile configuration file, the named MVS data sets have the same logging requirements.

WRITE and ALLOCATE access to the data set(s) containing the configuration files shared by TCP/IP applications is restricted to systems programming personnel.
Note: For systems running the TSS ACP replace the WRITE and ALLOCATE with WRITE, UPDATE, CREATE, CONTROL, SCRATCH, and ALL.

Fix Text (F-25264r504774_fix)
Review the data set access authorizations defined to the ACP for the Base TCP/IP component. Configure these data sets to be protected in accordance with the following rules: WRITE and ALLOCATE access to product data sets is restricted to systems programming personnel (i.e., SMP/E distribution data sets with the prefix SYS1.TCPIP.AEZA and target data sets with the prefix SYS1.TCPIP. SEZA). WRITE and ALLOCATE access to the data set(s) containing the Data and Profile configuration files is restricted to systems programming personnel. Note: If any INCLUDE statements are specified in the Profile configuration file, the named MVS data sets have the same access authorization requirements. WRITE and ALLOCATE access to the data set(s) containing the Data and Profile configuration files is logged. Note: If any INCLUDE statements are specified in the Profile configuration file, the named MVS data sets have the same logging requirements. WRITE and ALLOCATE access to the data set(s) containing the configuration files shared by TCP/IP applications is restricted to systems programming personnel. Note: For systems running the TSS ACP replace the WRITE and ALLOCATE with WRITE, UPDATE, CREATE, CONTROL, SCRATCH, and ALL.

Fix Text (F-25264r504774_fix)

Review the data set access authorizations defined to the ACP for the Base TCP/IP component. Configure these data sets to be protected in accordance with the following rules:

WRITE and ALLOCATE access to product data sets is restricted to systems programming personnel (i.e., SMP/E distribution data sets with the prefix SYS1.TCPIP.AEZA and target data sets with the prefix SYS1.TCPIP. SEZA).

WRITE and ALLOCATE access to the data set(s) containing the Data and Profile configuration files is restricted to systems programming personnel.
Note: If any INCLUDE statements are specified in the Profile configuration file, the named MVS data sets have the same access authorization requirements.

WRITE and ALLOCATE access to the data set(s) containing the Data and Profile configuration files is logged.
Note: If any INCLUDE statements are specified in the Profile configuration file, the named MVS data sets have the same logging requirements.

WRITE and ALLOCATE access to the data set(s) containing the configuration files shared by TCP/IP applications is restricted to systems programming personnel.
Note: For systems running the TSS ACP replace the WRITE and ALLOCATE with WRITE, UPDATE, CREATE, CONTROL, SCRATCH, and ALL.