Title

Connections to non-domain networks when connected to a domain authenticated network must be blocked. (Cat II impact)

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 Content

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 Text

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".

Additional Identifiers

Rule ID: SV-253365r991589_rule

Vulnerability ID: V-253365

Group Title: SRG-OS-000480-GPOS-00227

Expert Comments

CCIs tied to check.

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