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The machine inactivity limit must be set to 15 minutes, locking the system with the screensaver.


Overview

Finding ID Version Rule ID IA Controls Severity
V-36773 WN12-SO-000021 SV-51596r2_rule Medium
Description
Unattended systems are susceptible to unauthorized use and should be locked when unattended. The screen saver should be set at a maximum of 15 minutes and be password protected. This protects critical and sensitive data from exposure to unauthorized personnel with physical access to the computer.
STIG Date
Windows Server 2012/2012 R2 Domain Controller Security Technical Implementation Guide 2018-09-05

Details

Check Text ( C-46851r2_chk )
If the following registry value does not exist or is not configured as specified, this is a finding:

Registry Hive: HKEY_LOCAL_MACHINE
Registry Path: \Software\Microsoft\Windows\CurrentVersion\Policies\System\

Value Name: InactivityTimeoutSecs

Value Type: REG_DWORD
Value: 0x00000384 (900) (or less, excluding "0" which is effectively disabled)
Fix Text (F-44717r2_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "Interactive logon: Machine inactivity limit" to "900" seconds" or less, excluding "0" which is effectively disabled.