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Check: WN16-MS-000310

Microsoft Windows Server 2016 STIG: WN16-MS-000310 (in versions v2 r8 through v2 r5)

Title

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

Discussion

The Windows Security Account Manager (SAM) stores users' passwords. Restricting Remote Procedure Call (RPC) connections to the SAM to Administrators helps protect those credentials.

Check Content

This applies to member servers and standalone or nondomain-joined systems. It is NA for domain controllers. 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

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.

Additional Identifiers

Rule ID: SV-225013r877392_rule

Vulnerability ID: V-225013

Group Title: SRG-OS-000324-GPOS-00125

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CCIs

CCIs tied to check.

Number	Definition
CCI-002235	The information system prevents non-privileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
AC-6 (10)	Prohibit Non-Privileged Users From Executing Privileged Functions