Connections to non-domain networks when connected to a domain authenticated network must be blocked.

STIG ID: WN11-CC-000060 |  SRG: SRG-OS-000480-GPOS-00227 |  Severity: medium |  CCI:  | Vulnerability Id: V-253365

Vulnerability Discussion

Multiple network connections can provide additional attack vectors to a system and must be limited. When connected to a domain, communication must go through the domain connection.

Check

Configure the policy value for Computer Configuration >> Administrative Templates >> Network >> Windows Connection Manager >> "Prohibit connection to non-domain networks when connected to domain authenticated 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\WcmSvc\GroupPolicy\

Value Name: fBlockNonDomain

Value Type: REG_DWORD
Value: 1