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

Documentable No

Rule ID SV-253365r991589_rule

CCI References

CCI-000366

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 Procedure

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

Fix Action

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".