The CA-TSS NPPTHRESH Control Option must be properly set.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-223878	TSS0-ES-000050	SV-223878r958388_rule		Medium

Description

By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-force attacks, is reduced. Limits are imposed by locking the account.

STIG	Date
IBM z/OS TSS Security Technical Implementation Guide	2024-12-05

Details

Check Text (C-25551r516033_chk)

From the ISPF Command Shell enter:
TSS MODIFY STATUS

If the NPPTHRESH Control Option value is not set to NPWRTHRESH(02), this is a finding.

Fix Text (F-25539r516034_fix)

Evaluate the impact associated with implementation of the control option. Develop a plan of action to implement the control option setting as specified following and proceed with the change.

NPPTHRESH(02)