Internet connection sharing must be disabled.

STIG ID: WN11-CC-000044 |  SRG: SRG-OS-000095-GPOS-00049 |  Severity: medium |  CCI:  | Vulnerability Id: V-253361

Vulnerability Discussion

Internet connection sharing makes it possible for an existing internet connection, such as through wireless, to be shared and used by other systems essentially creating a mobile hotspot. This exposes the system sharing the connection to others with potentially malicious purpose.

Check

Configure the policy value for Computer Configuration >> Administrative Templates >> Network >> Network Connections >> "Prohibit use of Internet Connection Sharing on your DNS domain network" to "Enabled".

Fix

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: \SOFTWARE\Policies\Microsoft\Windows\Network Connections\

Value Name: NC_ShowSharedAccessUI

Type: REG_DWORD
Value: 0x00000000 (0)