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Check: WN16-SO-000140

Microsoft Windows Server 2016 STIG: WN16-SO-000140 (in versions v2 r9 through v1 r6)

Title

The machine inactivity limit must be set to 15 minutes, locking the system with the screen saver. (Cat II impact)

Discussion

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.

Check Content

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

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.

Additional Identifiers

Rule ID: SV-225035r958402_rule

Vulnerability ID: V-225035

Group Title: SRG-OS-000029-GPOS-00010

Expert Comments

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CCIs

CCIs tied to check.

Number	Definition
CCI-000057	Prevent further access to the system by initiating a device lock after organization-defined time period of inactivity; and/or requiring the user to initiate a device lock before leaving the system unattended.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
AC-11	Session Lock