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The Active Directory SYSVOL directory must have the proper access control permissions.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| WN12-AD-000002-DC | WN12-AD-000002-DC | WN12-AD-000002-DC_rule | High |
| Description |
|---|
| Improper access permissions for directory data files could allow unauthorized users to read, modify, or delete directory data. The SYSVOL directory contains public files (to the domain) such as policies and logon scripts. Data in shared subdirectories are replicated to all domain controllers in a domain. |
| STIG | Date |
|---|---|
| Microsoft Windows Server 2012 Domain Controller Security Technical Implementation Guide | 2013-07-25 |
Details
| Check Text ( C-WN12-AD-000002-DC_chk ) |
|---|
| Verify the permissions on the SYSVOL directory. Open a command prompt. Run "net share". Make note of the directory location of the SYSVOL share. By default this will be \Windows\SYSVOL\sysvol. For this requirement, permissions will be verified at the first SYSVOL directory level. Open File Explorer. Navigate to \Windows\SYSVOL (or the directory noted previously if different). Right click the directory and select properties. Select the Security tab. Click Advanced. If any standard user accounts or groups have greater than read & execute permissions, this is a finding. The default permissions noted below meet this requirement. Type - Allow Principal - Authenticated Users Access - Read & execute Inherited from - None Applies to - This folder, subfolder and files Type - Allow Principal - Server Operators Access - Read & execute Inherited from - None Applies to - This folder, subfolder and files Type - Allow Principal - Administrators Access - Special Inherited from - None Applies to - This folder only (Access - Special - Basic Permissions: all selected except Full control) Type - Allow Principal - CREATOR OWNER Access - Full control Inherited from - None Applies to - Subfolders and files only Type - Allow Principal - Administrators Access - Full control Inherited from - None Applies to - Subfolders and files only Type - Allow Principal - SYSTEM Access - Full control Inherited from - None Applies to - This folder, subfolders and files Alternately, use Icacls.exe to view the permissions of the SYSVOL directory. Open a command prompt. Run "icacls c:\Windows\SYSVOL The following results should be displayed: NT AUTHORITY\Authenticated Users:(RX) NT AUTHORITY\Authenticated Users:(OI)(CI)(IO)(GR,GE) BUILTIN\Server Operators:(RX) BUILTIN\Server Operators:(OI)(CI)(IO)(GR,GE) BUILTIN\Administrators:(M,WDAC,WO) BUILTIN\Administrators:(OI)(CI)(IO)(F) NT AUTHORITY\SYSTEM:(F) NT AUTHORITY\SYSTEM:(OI)(CI)(IO)(F) BUILTIN\Administrators:(M,WDAC,WO) CREATOR OWNER:(OI)(CI)(IO)(F) (RX) - Read & execute Run "icacls /help" to view definitions of other permission codes. |
| Fix Text (F-WN12-AD-000002-DC_fix) |
|---|
| Ensure the permissions on SYSVOL directory do not allow greater than read & execute for standard user accounts or groups. The defaults below meet this requirement. Type - Allow Principal - Authenticated Users Access - Read & execute Inherited from - None Applies to - This folder, subfolder and files Type - Allow Principal - Server Operators Access - Read & execute Inherited from - None Applies to - This folder, subfolder and files Type - Allow Principal - Administrators Access - Special Inherited from - None Applies to - This folder only (Access - Special - Basic Permissions: all selected except Full control) Type - Allow Principal - CREATOR OWNER Access - Full control Inherited from - None Applies to - Subfolders and files only Type - Allow Principal - Administrators Access - Full control Inherited from - None Applies to - Subfolders and files only Type - Allow Principal - SYSTEM Access - Full control Inherited from - None Applies to - This folder, subfolders and files |