Standard user accounts must only have Read permissions to the Winlogon registry key.

From Windows 8/8.1 Security Technical Implementation Guide

Associated with: CCI-002235

SV-48504r3_rule Standard user accounts must only have Read permissions to the Winlogon registry key.

Vulnerability discussion

Permissions on the Winlogon registry key must only allow privileged accounts to change registry values. If standard users have this capability, there is a potential for programs to run with elevated privileges when a privileged user logs on to the system.

Check content

Run "Regedit". Navigate to the following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\ Right-click on "WinLogon" and select "Permissions…". Select "Advanced". If the permissions are not as restrictive as the defaults listed below, this is a finding. The following are the same for each permission listed: Type - Allow Inherited from - MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion Applies to - This key and subkeys Columns: Principal - Access TrustedInstaller - Full Control SYSTEM - Full Control Administrators - Full Control Users - Read ALL APPLICATION PACKAGES - Read

Fix text

Maintain permissions at least as restrictive as the defaults listed below for the "WinLogon" registry key. It is recommended to not change the permissions from the defaults. HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\ The following are the same for each permission listed: Type - Allow Inherited from - MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion Applies to - This key and subkeys Columns: Principal - Access TrustedInstaller - Full Control SYSTEM - Full Control Administrators - Full Control Users - Read ALL APPLICATION PACKAGES - Read

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