Windows Server 2019 non-system-created file shares must limit access to groups that require it.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-205721	SRG-OS-000138-GPOS-00069	WN19-00-000230	SV-205721r958524_rule	2025-02-25	3

Description
Shares on a system provide network access. To prevent exposing sensitive information, where shares are necessary, permissions must be reconfigured to give the minimum access to accounts that require it.

ℹ️ Check
If only system-created shares such as "ADMIN$", "C$", and "IPC$" exist on the system, this is NA. (System-created shares will display a message that it has been shared for administrative purposes when "Properties" is selected.) Run "Computer Management". Navigate to System Tools >> Shared Folders >> Shares. Right-click any non-system-created shares. Select "Properties". Select the "Share Permissions" tab. If the file shares have not been configured to restrict permissions to the specific groups or accounts that require access, this is a finding. Select the "Security" tab. If the permissions have not been configured to restrict permissions to the specific groups or accounts that require access, this is a finding.

ℹ️ Check

If only system-created shares such as "ADMIN$", "C$", and "IPC$" exist on the system, this is NA. (System-created shares will display a message that it has been shared for administrative purposes when "Properties" is selected.) Run "Computer Management". Navigate to System Tools >> Shared Folders >> Shares. Right-click any non-system-created shares. Select "Properties". Select the "Share Permissions" tab. If the file shares have not been configured to restrict permissions to the specific groups or accounts that require access, this is a finding. Select the "Security" tab. If the permissions have not been configured to restrict permissions to the specific groups or accounts that require access, this is a finding.

✔️ Fix
If a non-system-created share is required on a system, configure the share and NTFS permissions to limit access to the specific groups or accounts that require it. Remove any unnecessary non-system-created shares.