The password uniqueness must meet minimum requirements.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-1107	WN12-AC-000004	SV-52853r1_rule	IAIA-1 IAIA-2	Medium

Description
A system is more vulnerable to unauthorized access when system users recycle the same password several times without being required to change to a unique password on a regularly scheduled basis. This enables users to effectively negate the purpose of mandating periodic password changes.

STIG	Date
Windows Server 2012 Domain Controller Security Technical Implementation Guide	2014-01-07

Details

Check Text ( C-47170r2_chk )
Verify the effective setting in Local Group Policy Editor. Run "gpedit.msc". Navigate to Local Computer Policy -> Computer Configuration -> Windows Settings -> Security Settings -> Account Policies -> Password Policy. If the value for "Enforce password history" is less than "5" passwords remembered, this is a finding.

Fix Text (F-45779r1_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Account Policies -> Password Policy -> "Enforce password history" to "5" (or more) passwords remembered.