CA-ACF2 LOGONIDs must not be defined to SYS1.UADS for non-emergency use.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-223456	ACF2-ES-000350	SV-223456r877392_rule		High

Description
Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Non-privileged users are individuals that do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from non-privileged users.

Description

Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges. Privileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Non-privileged users are individuals that do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from non-privileged users.

STIG	Date
IBM z/OS ACF2 Security Technical Implementation Guide	2023-12-18

Details

Check Text ( C-25129r500499_chk )
Ask the system administrator to provide a list of all emergency userids available to the site along with the associated function of each. If SYS1.UADS userids are limited and reserved for emergency purposes only, this is not a finding.

Fix Text (F-25117r500500_fix)
Configure the SYS1.UADS entries to ensure LOGONIDs defined include only those users required to support specific functions related to system recovery. Evaluate the impact of accomplishing the change.