Remote calls to the Security Account Manager (SAM) must be restricted to Administrators.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-71769	WN10-SO-000167	SV-86393r2_rule		Medium

Description
The Windows Security Account Manager (SAM) stores users' passwords. Restricting remote rpc connections to the SAM to Administrators helps protect those credentials.

STIG	Date
Windows 10 Security Technical Implementation Guide	2017-02-21

Details

Check Text ( C-74023r1_chk )
This is NA prior to v1607 of Windows 10. 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: \SYSTEM\CurrentControlSet\Control\Lsa\ Value Name: RestrictRemoteSAM Value Type: REG_SZ Value: O:BAG:BAD:(A;;RC;;;BA)

Fix Text (F-78121r3_fix)
Navigate to the policy Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network access: Restrict clients allowed to make remote calls to SAM". Select "Edit Security" to configure the "Security descriptor:". Add "Administrators" in "Group or user names:" if it is not already listed (this is the default). Select "Administrators" in "Group or user names:". Select "Allow" for "Remote Access" in "Permissions for "Administrators". Click "OK". The "Security descriptor:" must be populated with "O:BAG:BAD:(A;;RC;;;BA) for the policy to be enforced.

Fix Text (F-78121r3_fix)

Navigate to the policy Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> Security Options >> "Network access: Restrict clients allowed to make remote calls to SAM".

Select "Edit Security" to configure the "Security descriptor:".

Add "Administrators" in "Group or user names:" if it is not already listed (this is the default).

Select "Administrators" in "Group or user names:".

Select "Allow" for "Remote Access" in "Permissions for "Administrators".

Click "OK".

The "Security descriptor:" must be populated with "O:BAG:BAD:(A;;RC;;;BA) for the policy to be enforced.