IBM z/OS user account for the UNIX (RMFGAT) must be properly defined.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-223495	ACF2-ES-000770	SV-223495r861168_rule		Medium

Description
To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to prevent potential misuse and compromise of the system. Organizational users include organizational employees or individuals the organization deems to have equivalent status of employees (e.g., contractors). Organizational users (and processes acting on behalf of users) must be uniquely identified and authenticated to all accesses, except for the following: 1) Accesses explicitly identified and documented by the organization. Organizations document specific user actions that can be performed on the information system without identification or authentication; and 2) Accesses that occur through authorized use of group authenticators without individual authentication. Organizations may require unique identification of individuals in group accounts (e.g., shared privilege accounts) or for detailed accountability of individual activity.

Description

To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to prevent potential misuse and compromise of the system. Organizational users include organizational employees or individuals the organization deems to have equivalent status of employees (e.g., contractors). Organizational users (and processes acting on behalf of users) must be uniquely identified and authenticated to all accesses, except for the following: 1) Accesses explicitly identified and documented by the organization. Organizations document specific user actions that can be performed on the information system without identification or authentication; and 2) Accesses that occur through authorized use of group authenticators without individual authentication. Organizations may require unique identification of individuals in group accounts (e.g., shared privilege accounts) or for detailed accountability of individual activity.

STIG	Date
IBM z/OS ACF2 Security Technical Implementation Guide	2022-12-14

Details

Check Text ( C-25168r858856_chk )
RMFGAT is the userid for the Resource Measurement Facility (RMF) Monitor III Gatherer. If RMFGAT is not define, this is Not Applicable. From the ISPF Command Shell enter: ACF SET LID SET VERBOSE LIST RMFGAT SECTION(ALL) PROFILE(OMVS) If RMFGAT is defined as follows, this is not a finding: Default group specified as OMVSGRP or STCOMVS A unique, non-zero UID HOME directory specified as "/" Shell program specified as "/bin/sh"

Check Text ( C-25168r858856_chk )

RMFGAT is the userid for the Resource Measurement Facility (RMF) Monitor III Gatherer. If RMFGAT is not define, this is Not Applicable.

From the ISPF Command Shell enter:
ACF
SET LID
SET VERBOSE
LIST RMFGAT SECTION(ALL) PROFILE(OMVS)

If RMFGAT is defined as follows, this is not a finding:
Default group specified as OMVSGRP or STCOMVS
A unique, non-zero UID
HOME directory specified as "/"
Shell program specified as "/bin/sh"

Fix Text (F-25156r858857_fix)
Define the RMFGAT user account as specified below: Default group specified as OMVSGRP or STCOMVS A unique, non-zero UID HOME directory specified as "/" Shell program specified as "/bin/sh"