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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-7050	ZUSS0048	SV-7433r2_rule	DCCS-1 DCCS-2	Medium

Description
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.

STIG	Date
z/OS ACF2 STIG	2016-01-04

Details

Check Text ( C-20758r1_chk )
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.

Check Text ( C-20758r1_chk )

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 (F-18694r1_fix)
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)

Fix Text (F-18694r1_fix)

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)