Dynamic lists must be protected in accordance with proper security requirements. - z/OS ACF2 STIG

Associated with IA controls: DCCS-1, ECCD-2, DCCS-2, ECAR-3, ECAR-2, ECCD-1, ECAR-1, DCSL-1

SV-36r4_rule Dynamic lists must be protected in accordance with proper security requirements.

Vulnerability discussion

Dynamic lists provide a method of making z/OS system changes without interrupting the availability of the operating system. Failure to properly control access to these facilities could result in unauthorized personnel modifying sensitive z/OS lists. This exposure may threaten the integrity and availability of the operating system environment, and compromise the confidentiality of customer data.

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Refer to the following report produced by the ACF2 Data Collection and Data Set and Resource Data Collection: - SENSITVE.RPT(FACILITY) - ACF2CMDS.RPT(RESOURCE) – Alternate report Automated Analysis Refer to the following report produced by the Data Set and Resource Data Collection: - PDI(ACP00270) Verify that the accesses for CSV-prefixed resources are properly restricted. If the following guidance is true, this is not a finding. ___ The ACF2 resources and/or generic equivalent are defined with a default access of PREVENT. ___ The ACF2 resources and/or generic equivalent identified below will be defined with LOG and SERVICE(UPDATE) access restricted to system programming personnel: CSVAPF. CSVAPF.MVS.SETPROG.FORMAT.DYNAMIC CSVAPF.MVS.SETPROG.FORMAT.STATIC CSVDYLPA. CSVDYNEX. CSVDYNEX.LIST CSVDYNL. CSVDYNL.UPDATE.LNKLST CSVLLA. ___ The ACF2 CSVDYNEX.LIST resource and/or generic equivalent will be defined with LOG and SERVICE(UPDATE) access restricted to system programming personnel. ___ The ACF2 CSVDYNEX.LIST resource and/or generic equivalent will be defined with SERVICE(READ) access restricted to auditors. ___ If the products CICS and/or Control-O are on the system, the ACF2 access to the CSVLLA resource and/or generic equivalent will be defined with LOG and SERVICE(UPDATE) access restricted to the CICS and Control-O ACIDs. ___ If the product CA 1 and/or CA Common Services is on the system, the ACF2 access to the CSVDYLPA resource and/or generic equivalent will be defined with LOG and SERVICE(UPDATE) access restricted to the CA 1 and/or CA Common Services logonids. Note: In the above, SERVICE(UPDATE) can be substituted with ADD, CONTROL, or LOG/ALLOW. Review the rules definitions in the ACF2 documentation when specifying SERVICE(UPDATE).

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The IAO working with the system programmer will ensure that the Dynamic List resources are defined to the IBMFAC resource class and protected. Only system programmers and a limited number of authorized users and Started Tasks are able to issue these commands. All access is logged. (Note: The resource class, resources, and/or resource prefixes identified below are examples of a possible installation. The resource class, actual resources, and/or prefixes are determined when the product is actually installed on a system through the product’s installation guide and can be site specific.) The required CSV-prefixed Facility Class resources are listed below. These resources and/or generic equivalents should be defined and permitted as required with only z/OS systems programmers and logging enabled. Minimum required list of CSV-prefixed resources: CSVAPF.- CSVAPF.MVS.SETPROG.FORMAT.DYNAMIC CSVAPF.MVS.SETPROG.FORMAT.STATIC CSVDYLPA.- CSVDYNEX.- CSVDYNEX.LIST CSVDYNL.- CSVDYNL.UPDATE.LNKLST CSVLLA.- Limit authority to those resources to z/OS systems programmers. Restrict to the absolute minimum number of personnel with LOG and SERVICE(UPDATE) access. Sample commands are shown here to accomplish one set of resources: $KEY(CSVAPF) TYPE(FAC) MVS.SETPROG.- UID(syspaudt) LOG MVS.SETPROG.FORMAT.DYNAMIC.- UID(syspaudt) LOG MVS.SETPROG.FORMAT.STATIC.- UID(syspaudt) LOG MVS.SETPROG.FORMAT.- UID(syspaudt) LOG MVS.SETPROG.FORMAT.- UID(*) PREVENT - UID(syspaudt) LOG - UID(*) PREVENT SET R(FAC) COMPILE 'ACF2.xxxx.FAC(CSVAPF)' STORE F ACF2,REBUILD(FAC) The CSVLLA resource can be permitted to systems programmers, CICS, and Control-O logonids with LOG and SERVICE(UPDATE) access. Sample commands are shown here to accomplish one set of resources: $KEY(CSVLLA) TYPE(FAC) - UID(syspaudt) LOG - UID(CICS logonid) LOG SERVICE(UPDATE) - UID(Control-O logonid) LOG SERVICE(UPDATE) - UID(*) PREVENT SET R(FAC) COMPILE 'ACF2.xxxx.FAC(CSVLLA)' STORE F ACF2,REBUILD(FAC) The CSVDYLPA resource can be permitted to CA 1 and/or CA Common Services STC logonids with LOG and SERVICE(UPDATE) access. Sample commands are shown here to accomplish one set of resources: $KEY(CSVDYLPA) TYPE(FAC) - UID(syspaudt) LOG - UID(CA 1 STC) LOG SERVICE(UPDATE) - UID(CCS STC) LOG SERVICE(UPDATE) - UID(*) PREVENT SET R(FAC) COMPILE 'ACF2.xxxx.FAC(CSVDYLPA)' STORE F ACF2,REBUILD(FAC) The CSVDYNEX.LIST resource and/or generic equivalent will be defined with LOG and SERVICE(UPDATE) access restricted to system programming personnel. The CSVDYNEX.LIST resource and/or generic equivalent will be defined with SERVICE(READ) access with ALLOW restricted to auditors. Sample commands are shown here to accomplish this: $KEY(CSVDYNEX) TYPE(FAC) LIST.- UID(syspaudt) LOG LIST.- UID(audtaudt) SERVICE(READ) ALLOW - UID(syspaudt) LOG - UID(*) PREVENT SET R(FAC) COMPILE 'ACF2.xxxx.FAC(CSVDYNEX)' STORE F ACF2,REBUILD(FAC)

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