Title

The user account for the z/OS UNIX kernel (OMVS) is not properly defined to the security database. (Cat II impact)

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

a) Refer to the following reports produced by the ACP Data Collection: ACF2 - ACF2CMDS.RPT(OMVSUSER) - ACF2CMDS.RPT(LOGONIDS) RACF - RACFCMDS.RPT(LISTUSER) TSS - TSSCMDS.RPT(@ACIDS) b) If OMVS is defined as follows, there is NO FINDING: 1) No access to interactive on-line facilities (e.g., TSO, CICS, etc.) 2) Default group specified as OMVSGRP or STCOMVS 3) UID(0) 4) HOME directory specified as “/” 5) Shell program specified as “/bin/sh” c) If OMVS is not defined as specified in (b) above, this is a FINDING

Fix Text

The systems programmer will verify that OMVS is defined as specified below: 1) No access to interactive on-line facilities (e.g., TSO, CICS, etc.) 2) Default group specified as OMVSGRP or STCOMVS 3) UID(0) 4) HOME directory specified as “/” 5) Shell program specified as “/bin/sh”

Additional Identifiers

Rule ID: SV-7290r2_rule

Vulnerability ID: V-6987

Group Title: ZUSS0043

Expert Comments

CCIs tied to check.

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