The user account for the z/OS UNIX SUPERSUSER userid must be properly defined.

Associated with: CCI-000764

SV-87465r1_rule The user account for the z/OS UNIX SUPERSUSER userid must be properly defined.

Vulnerability discussion

User identifiers (ACF2 logonids, RACF userids, and Top Secret ACIDs), groups, and started tasks that use z/OS UNIX facilities are defined to an ACP with attributes including UID and GID. If these attributes are not correctly defined, data access or command privilege controls could be compromised.

Check content

Refer to system PARMLIB member BPXPRMxx (xx is determined by OMVS entry in IEASYS00.) Determine the user ID identified by the SUPERUSER parameter. (BPXROOT is the default). From a command input screen enter: LISTUSER (superuser userid) TSO CICS OMVS Alternately, - RACFCMDS.RPT(LISTUSER) If the SUPERUSER userid is defined as follows, this is not a finding: - No access to interactive on-line facilities (e.g., TSO, CICS, etc.) - Default group specified as OMVSGRP or STCOMVS - UID(0) - HOME directory specified as “/” - Shell program specified as “/bin/sh”

Fix text

Define the user ID identified in the BPXPRM00 SUPERUSER parameter as specified below: - No access to interactive on-line facilities (e.g., TSO, CICS, etc.) - Default group specified as OMVSGRP or STCOMVS - UID(0) - HOME directory specified as “/” - Shell program specified as “/bin/sh”

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