The Modify firmware environment values user right must only be assigned to the Administrators group.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-63931	WN10-UR-000140	SV-78421r1_rule		Medium

Description
Inappropriate granting of user rights can provide system, administrative, and other high level capabilities. Accounts with the "Modify firmware environment values" user right can change hardware configuration environment variables. This could result in hardware failures or a DoS.

STIG	Date
Windows 10 Security Technical Implementation Guide	2018-04-06

Details

Check Text ( C-64681r1_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 >> User Rights Assignment. If any groups or accounts other than the following are granted the "Modify firmware environment values" user right, this is a finding: Administrators

Fix Text (F-69859r1_fix)
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Modify firmware environment values" to only include the following groups or accounts: Administrators