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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-73795 WN16-UR-000270 SV-88459r2_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 denial of service.
STIG Date
Windows Server 2016 Security Technical Implementation Guide 2019-07-09

Details

Check Text ( C-91527r1_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 accounts or groups other than the following are granted the "Modify firmware environment values" user right, this is a finding.

- Administrators

For server core installations, run the following command:

Secedit /Export /Areas User_Rights /cfg c:\path\filename.txt

Review the text file.

If any SIDs other than the following are granted the "SeSystemEnvironmentPrivilege" user right, this is a finding.

S-1-5-32-544 (Administrators)
Fix Text (F-80245r1_fix)
Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Modify firmware environment values" to include only the following accounts or groups:

- Administrators