STIGQter STIGQter: STIG Summary: z/OS ACF2 STIG Version: 6 Release: 43 Benchmark Date: 24 Jan 2020: Attributes of z/OS UNIX user accounts used for account modeling must be defined in accordance with security requirements.

DISA Rule

SV-7433r5_rule

Vulnerability Number

V-7050

Group Title

ZUSS0048

Rule Version

ZUSS0048

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Ensure that the below options are enforced.

Note: This only applies to DFTUSER or MODLUSER or BPX.UNIQUE.USER as appropriate.

Ensure that DFTUSER or MODLUSER or BPX.UNIQUE.USER user account is defined as follows:

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)

Check Contents

If this is a classified system this is not applicable.
From an ACF2 command line enter:
SET CONTROL(GSO)
SHOW UNIXOPTS
Alternately:
Refer to the following report produced by the ACF2 Data Collection:

- ACF2CMDS.RPT(ACFGSO)
- ACF2CMDS.RPT(OMVSUSER)

Note: This check applies to any user identifier (LOGONID) used to model OMVS access on the mainframe. This includes any DFTUSER; MODLUSER and BPX.UNIQUE.USER. If MODLUSER is specified then UNIQUSER must be specified.

If DFTUSER or MODLUSER is not defined in the UNIXOPTS record there is no finding.

If ALL user identifiers (LOGONID) defined to DFTUSER or MODLUSER. or BPX.UNIQUE.USER user account is defined as follows, there is no finding:

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).

Vulnerability Number

V-7050

Documentable

False

Rule Version

ZUSS0048

Severity Override Guidance

If this is a classified system this is not applicable.
From an ACF2 command line enter:
SET CONTROL(GSO)
SHOW UNIXOPTS
Alternately:
Refer to the following report produced by the ACF2 Data Collection:

- ACF2CMDS.RPT(ACFGSO)
- ACF2CMDS.RPT(OMVSUSER)

Note: This check applies to any user identifier (LOGONID) used to model OMVS access on the mainframe. This includes any DFTUSER; MODLUSER and BPX.UNIQUE.USER. If MODLUSER is specified then UNIQUSER must be specified.

If DFTUSER or MODLUSER is not defined in the UNIXOPTS record there is no finding.

If ALL user identifiers (LOGONID) defined to DFTUSER or MODLUSER. or BPX.UNIQUE.USER user account is defined as follows, there is no finding:

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).

Check Content Reference

M

Responsibility

Information Assurance Officer

Target Key

198

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