ACF2 PSWD GSO record value must be set to prohibit password reuse for a minimum of five generations or more.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-223508	ACF2-ES-000910	SV-223508r1001119_rule		Medium

Description

Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. If the information system or application allows the user to consecutively reuse their password when that password has exceeded its defined lifetime, the end result is a password that is not changed as per policy requirements.

STIG	Date
IBM z/OS ACF2 Security Technical Implementation Guide	2025-06-24

Details

Check Text (C-25181r1001118_chk)

From an ACF command screen enter:
SET CONTROL(GSO)
LIST PSWD

If "PSWDXHIST" is not specified, this is a finding.

If "PSWDXHIST#" is set to "5" or greater, this is not a finding.

Fix Text (F-25169r500658_fix)

Configure Password option "PSWXHST" is coded and "PSWXHST#" is "5" or greater.