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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-6988	ZUSS0044	SV-7291r3_rule		Medium

Description
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.

STIG	Date
z/OS ACF2 STIG	2019-12-12

Details

Check Text ( C-72945r4_chk )
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: SET LID LIST LIKE (superuser userid) 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 From a command input screen enter: SET PROFILE(USER) DIVISION(OMVS) SET VERBOSE LIST If the SUPERUSER userid is defined as follows, this is not a FINDING: - UID(0) - HOME directory specified as “/” - Shell program specified as “/bin/sh” Alternately, Refer to the following reports produced by the ACP Data Collection: -ACF2CMDS.RPT(OMVSUSER) -ACF2CMDS.RPT(LOGONIDS) If 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”

Check Text ( C-72945r4_chk )

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:
SET LID
LIST LIKE (superuser userid)
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

From a command input screen enter:
SET PROFILE(USER) DIVISION(OMVS)
SET VERBOSE
LIST
If the SUPERUSER userid is defined as follows, this is not a FINDING:
- UID(0)
- HOME directory specified as “/”
- Shell program specified as “/bin/sh”

Alternately,
Refer to the following reports produced by the ACP Data Collection:

-ACF2CMDS.RPT(OMVSUSER)
-ACF2CMDS.RPT(LOGONIDS)

If 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 (F-79251r4_fix)
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”