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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-98853	TSS0-TS-000020	SV-107957r1_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 TSS Security Technical Implementation Guide	2020-06-29

Details

Check Text ( C-97689r1_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 any SYS1.UADS userids are assigned for other than emergency purposes, this is a finding.

Fix Text (F-104529r1_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.