Attributes of z/OS UNIX user accounts are not defined properly

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-6985	ZUSS0041	SV-7288r2_rule	DCCS-1 DCCS-2	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	2017-03-22

Details

Check Text ( C-3618r1_chk )
Refer to the following report produced by the ACP Data Collection: ACF2 - ACF2CMDS.RPT(OMVSGRP) RACF - RACFCMDS.RPT(LISTGRP) TSS - TSSCMDS.RPT(OMVSUSER) Automated Analysis Refer to the following report produced by the z/OS Data Collection: - PDI(ZUSS0041) NOTE: A site can choose to have both an OMVSGRP group and an STCOMVS group or combine the groups under one of these names. Ensure that the OMVSGRP and/or STCOMVS groups are defined and have a unique GID in the range of 1-99.

Check Text ( C-3618r1_chk )

Refer to the following report produced by the ACP Data Collection:

ACF2
- ACF2CMDS.RPT(OMVSGRP)
RACF
- RACFCMDS.RPT(LISTGRP)
TSS
- TSSCMDS.RPT(OMVSUSER)

Automated Analysis
Refer to the following report produced by the z/OS Data Collection:

- PDI(ZUSS0041)

NOTE: A site can choose to have both an OMVSGRP group and an STCOMVS group or combine the groups under one of these names.

Ensure that the OMVSGRP and/or STCOMVS groups are defined and have a unique GID in the range of 1-99.

Fix Text (F-18960r1_fix)
The Systems Programmer will ensure that the OMVSGRP group and / or the STCOMVS group are each defined to the security database with a unique GID in the range of 1-99. OMVSGRP is the name suggested by IBM for all the required userids. STCOMVS is the standard name used at some sites for the userids that are associated with z/OS UNIX started tasks and daemons. These groups can be combined at the site’s discretion.

Fix Text (F-18960r1_fix)

The Systems Programmer will ensure that the OMVSGRP group and / or the STCOMVS group are each defined to the security database with a unique GID in the range of 1-99.

OMVSGRP is the name suggested by IBM for all the required userids. STCOMVS is the standard name used at some sites for the userids that are associated with z/OS UNIX started tasks and daemons. These groups can be combined at the site’s discretion.