z/OS UNIX each group is not defined with a unique GID.

Associated with IA controls: DCCS-1, DCCS-2

Associated with: CCI-000764

SV-7289r2_rule z/OS UNIX each group is not defined with a unique GID.

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 the following report produced by the ACP Data Collection: ACF2 - ACF2CMDS.RPT(OMVSGRP) RACF - RACFCMDS.RPT(LISTGRP) Automated Analysis Refer to the following report produced by the z/OS Data Collection: - PDI(ZUSS0042) For ACF2 and RACF ensure that each GID is unique to a specific group. For TSS this is Not Applicable.

Fix text

The systems programmer will verify that each group has a unique GID number,

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