The built-in guest account must be disabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-225448	WN12-SO-000003	SV-225448r569185_rule		Medium

Description
A system faces an increased vulnerability threat if the built-in guest account is not disabled. This account is a known account that exists on all Windows systems and cannot be deleted. This account is initialized during the installation of the operating system with no password assigned.

STIG	Date
Microsoft Windows Server 2012/2012 R2 Member Server Security Technical Implementation Guide	2022-03-01

Details

Check Text ( C-27147r471686_chk )
Verify the effective setting in Local Group Policy Editor. Run "gpedit.msc". Navigate to Local Computer Policy -> Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options. If the value for "Accounts: Guest account status" is not set to "Disabled", this is a finding.

Fix Text (F-27135r471687_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Accounts: Guest account status" to "Disabled".