Title

Dynamic lists must be protected in accordance with proper security requirements. (Cat I impact)

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.

Check Content

Refer to the following report produced by the Data Set and Resource Data Collection: - SENSITVE.RPT(FACILITY) 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 RACF resources and/or generic equivalent are defined with a default access of NONE. ___ The RACF resources and/or generic equivalent identified below will be defined with AUDIT(ALL(READ)) and 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 RACF CSVDYNEX.LIST resource and/or generic equivalent will be defined with AUDIT(FAILURE(READ)SUCCESS(UPDATE)) and UPDATE access restricted to system programming personnel. ___ The RACF CSVDYNEX.LIST resource and/or generic equivalent will be defined with READ access restricted to auditors. ___ If the products CICS and/or CONTROL-O are on the system, the RACF access to the CSVLLA resource and/or generic equivalent will be defined with AUDIT(ALL) and UPDATE access restricted to the CICS and CONTROL-O STC userids. ___ ___ If any software product requires access to dynamic LPA updates on the system, the RACF access to the CSVDYLPA resource and/or generic equivalent will be defined with LOG and SERVICE(UPDATE) only after the product has been validated with the appropriate STIG or SRG for compliance AND receives documented and filed authorization that details the need and any accepted risks from the site ISSM or equivalent security authority. Note: In the above, UPDATE access can be substituted with ALTER or CONTROL. Review the permissions in the IBM documentation when specifying UPDATE.

Fix Text

Ensure that the Dynamic List resources are defined to the FACILITY resource class and protected. Only system programmers and a limited number of authorized users and Approved authorized Started Tasks are able to issue these commands. All access is logged. The required CSV-prefixed Facility Class resources are listed below. These resources 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.** CSVDYLPA.ADD.** CSVDYLPA.DELETE.** 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 AUDIT(ALL(READ)) and UPDATE access. Sample commands are shown here to accomplish this: RDEF FACILITY CSVAPF.** UACC(NONE) OWNER(syspaudt) AUDIT(ALL(READ)) RDEF FACILITY CSVAPF.MVS.SETPROG.FORMAT.DYNAMIC.** UACC(NONE) OWNER(syspaudt) AUDIT(ALL(READ)) RDEF FACILITY CSVAPF.MVS.SETPROG.FORMAT.STATIC.** UACC(NONE) OWNER(syspaudt) AUDIT(ALL(READ)) PERMIT CSVAPF.** CLASS(FACILITY) ID(syspaudt) ACCESS(UPDATE) PERMIT CSVAPF.MVS.SETPROG.SETPROG.FORMAT.DYNAMIC.** CLASS(FACILITY) ID(syspaudt) ACCESS(UPDATE) PERMIT CSVAPF.MVS.SETPROG.SETPROG.FORMAT.STATIC.** CLASS(FACILITY) ID(syspaudt) ACCESS(UPDATE) The CSVDYLPA.ADD resource will be permitted to products BMC Mainview, CA 1, and CA Common Services STC userids with AUDIT(ALL(READ)) and UPDATE access. The CSVDYLPA.DELETE resource will be permitted to products CA 1 and CA Common Services STC userids with AUDIT(ALL(READ)) and UPDATE access. Sample commands are shown here to accomplish one set of resources: RDEF FACILITY CSVDYLPA.** UACC(NONE) OWNER(syspaudt) AUDIT(ALL(READ)) RDEF FACILITY CSVDYLPA.ADD.** UACC(NONE) OWNER(syspaudt) AUDIT(ALL(READ)) RDEF FACILITY CSVDYLPA.DELETE.** UACC(NONE) OWNER(syspaudt) AUDIT(ALL(READ)) PERMIT CSVDYLPA.** CLASS(FACILITY) ID(syspaudt) ACCESS(UPDATE) PERMIT CSVDYLPA.** CLASS(FACILITY) ID(BMC Mainview STC userid) ACCESS(UPDATE) PERMIT CSVDYLPA.** CLASS(FACILITY) ID(CA 1 STC userid) ACCESS(UPDATE) PERMIT CSVDYLPA.** CLASS(FACILITY) ID(CCS STC userid) ACCESS(UPDATE) PERMIT CSVDYLPA.ADD.** CLASS(FACILITY) ID(syspaudt) ACCESS(UPDATE) PERMIT CSVDYLPA.ADD.** CLASS(FACILITY) ID(BMC Mainview STC userid) ACCESS(UPDATE) PERMIT CSVDYLPA.ADD.** CLASS(FACILITY) ID(CA 1 STC userid) ACCESS(UPDATE) PERMIT CSVDYLPA.ADD.** CLASS(FACILITY) ID(CCS STC userid) ACCESS(UPDATE) PERMIT CSVDYLPA.DELETE.** CLASS(FACILITY) ID(syspaudt) ACCESS(UPDATE) PERMIT CSVDYLPA.DELETE.** CLASS(FACILITY) ID(CA 1 STC userid) ACCESS(UPDATE) PERMIT CSVDYLPA.DELETE.** CLASS(FACILITY) ID(CCS STC userid) ACCESS(UPDATE) The CSVDYNEX.LIST resource and/or generic equivalent will be defined with AUDIT(FAILURE(READ)SUCCESS(UPDATE)) and UPDATE access restricted to system programming personnel. The CSVDYNEX.LIST resource and/or generic equivalent will be defined with READ access restricted to auditors. Sample commands are shown here to accomplish this: RDEF FACILITY CSVDYNEX.** UACC(NONE) OWNER(syspaudt) – AUDIT(ALL(READ)) RDEF FACILITY CSVDYNEX.LIST.** UACC(NONE) OWNER(syspaudt) – AUDIT(FAILURE(READ)SUCCESS(UPDATE)) PERMIT CSVDYNEX.** CLASS(FACILITY) ID(syspaudt) ACCESS(UPDATE) PERMIT CSVDYNEX.LIST.** CLASS(FACILITY) ID(syspaudt) ACCESS(UPDATE) PERMIT CSVDYNEX.LIST.** CLASS(FACILITY) ID(audtaudt) ACCESS(READ) The CSVLLA resource will be permitted to CICS and CONTROL-O STC userids with AUDIT(ALL(READ)) and UPDATE access. Sample commands are shown here to accomplish one set of resources: RDEF FACILITY CSVLLA.** UACC(NONE) OWNER(syspaudt) AUDIT(ALL(READ)) PERMIT CSVLLA.** CLASS(FACILITY) ID(syspaudt) ACCESS(UPDATE) PERMIT CSVLLA.** CLASS(FACILITY) ID(CICS STC userids) ACCESS(UPDATE) PERMIT CSVLLA.** CLASS(FACILITY) ID(CONTROL-O STC userid) ACCESS(UPDATE)

Additional Identifiers

Rule ID: SV-6409r8_rule

Vulnerability ID: V-36

Group Title: ACP00270

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.