Title

Operating system commands (MVS.) of the OPERCMDS resource class are not properly owned.. (Cat II impact)

Discussion

z/OS system commands provide a method of controlling the operating environment. Failure to properly control access to z/OS system commands could result in unauthorized personnel issuing sensitive system commands. This exposure may threaten the integrity and availability of the operating system environment, and compromise the confidentiality of customer data.

Check Content

a) Refer to the following report produced by the TSS Data Collection: - TSSCMDS.RPT(WHOOOPER) Automated Analysis Refer to the following report produced by the Data Set and Resource Data Collection: - PDI(TSS0246) b) Review ownership of the MVS. resource in the OPERCMDS class. c) If the (MVS.) resource is owned by the OPERCMDS class, and/or the DEFPROT attribute is specified for the OPERCMDS resource class in the RDT, there is NO FINDING. d) If the (MVS.) resource is not owned or the OPERCMDS class does not have DEFPROT as mentioned in (c) above, or is inappropriately owned, this is a FINDING.

Fix Text

z/OS system command controls are provided via resources in the OPERCMDS resource class. The IAO will ensure that (MVS.) of the OPERCMDS resource class are properly owned or at a minimum the OPERCMDS resource in the RDT specifies the DEFPROT attribute. Name the actual owning ACID specified for deptacid in accordance with installation recommendations. When protecting the facilities for z/OS system commands via the OPERCMDS class, use the following controls: (1) Prevent access to the z/OS resources by default, and log all access. Create generic and specific permissions with logging as required using the required controls for z/OS System Commands listed in ACP00282. For example: TSS ADDTO(deptacid) OPERCMDS(MVS.) TSS PERMIT(usracid) OPERCMDS(MVS.ACTIVATE) ACTION(AUDIT) TSS PERMIT(usracid) OPERCMDS(MVS.CANCEL.JOB.) ACTION(AUDIT) TSS PERMIT(usracid) OPERCMDS(MVS.CONTROL.) ACCESS(UPDATE) ACTION(AUDIT) TSS PERMIT(usracid) OPERCMDS(MVS.DISPLAY.) ACCESS(READ) TSS PERMIT(usracid) OPERCMDS(MVS.MONITOR) ACCESS(READ) TSS PERMIT(usracid) OPERCMDS(MVS.STOPMN) ACCESS(READ)

Additional Identifiers

Rule ID: SV-7938r2_rule

Vulnerability ID: V-7493

Group Title: TSS0246

Expert Comments

CCIs tied to check.

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