Firewall traversal from remote host must be disabled

Part of DTBC0001 - Disable firewall traversal from remote host

Associated with IA controls: ECSC-1

Associated with: CCI-001588

SV-46751r1_rule Firewall traversal from remote host must be disabled

Vulnerability discussion

Remote connections should never be allowed that bypass the firewall, as there is no way to verify if they can be trusted."Enables usage of STUN and relay servers when remote clients are trying to establish a connection to this machine. If this setting is enabled, then remote clients can discover and connect to this machine even if they are separated by a firewall. If this setting is disabled and outgoing UDP connections are filtered by the firewall, then this machine will only allow connections from client machines within the local network. If this policy is left not set the setting will be enabled." - Google Chrome Administrators Policy List

Check content

Valid for Chrome Browser version 14 or later. Windows registry: Key Path: HKLM\Software\Policies\Google\Chrome\ Value Name: RemoteAccessHostFirewallTraversal Value Type: Boolean (REG_DWORD) Value Data: 0 Windows group policy: Policy Path: Computer Configuration\Administrative Templates\Google\Google Chrome\Configure remote access options\ Policy Name: Enable firewall traversal from remote access host Policy State: Disabled Policy Value: N/A

Fix text

Universal method (Requires Chrome Browser v15 or later): 1. In the omnibox (address bar) type chrome://policy 2. If RemoteAccessHostFirewallTraversal is not displayed under the Policy Name column or it is not set to false under the Policy Value column, then this is a finding. Windows method: 1. Start regedit 2. Navigate to HKLM\Software\Policies\Google\Chrome\ 3. If the RemoteAccessHostFirewallTraversal value name does not exist or its value data is not set to 0, then this is a finding.

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