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


Finding ID Version Rule ID IA Controls Severity
V-223456 ACF2-ES-000350 SV-223456r533198_rule High
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.
IBM z/OS ACF2 Security Technical Implementation Guide 2022-06-22


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.