Attributes of z/OS UNIX user accounts are not defined in accordance with security requirements.

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

SV-7433r1_rule Attributes of z/OS UNIX user accounts are not defined in accordance with security requirements.

Vulnerability discussion

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

Check content

a) Refer to the following report produced by the ACF2 Data Collection: - ACF2CMDS.RPT(ACFGSO) - ACF2CMDS.RPT(OMVSUSER) NOTE: This check only applies to the OMVS default user. If the OMVS default user is not defined in the ACFGSO report, this is NOT APPLICABLE. b) If OMVS default user account is defined as follows, there is NO FINDING: 1) A unique UID number (except for UID(0) users) 2) A non-writable HOME directory 3) Shell program specified as “/bin/echo”, or “/bin/false” NOTE: The shell program must have one of the specified values. The HOME directory must have a value (i.e., not be allowed to default). c) If the user account is not defined as specified in (b) above, this is a FINDING.

Fix text

The Systems Programmer and IAO will ensure that the below options are enforced for FTP socket applications using shared OMVS segments. NOTE: This only applies to the OMVS default user. Ensure the OMVS default user account is defined as follows. A unique UID number (except for UID(0) users) A non-writable HOME directory Shell program specified as “/bin/echo”, or “/bin/false” NOTE: The shell program must have one of the specified values. The HOME directory must have a value (i.e., not be allowed to default). Example: SET PROFILE(USER) DIV(OMVS) LIST OMVS INSERT OMVS HOME(/) OMVSPGM(/bin/false) UID(0)

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