The system must be configured to disable dead gateway detection.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-4109	3.093	SV-29607r2_rule	ECSC-1	Low

Description
Dead gateway detection allows switching to a backup gateway if a number of connections to a gateway are experiencing difficulty. An attacker could force internal traffic to be directed to a gateway outside the network if enabled. This setting applies to all network adapters, regardless of their individual settings.

STIG	Date
Windows 2003 Domain Controller Security Technical Implementation Guide	2014-06-27

Details

Check Text ( C-51791r3_chk )

Analyze the system using the Security Configuration and Analysis snap-in. Expand the Security Configuration and Analysis tree view. Navigate to Local Policies -> Security Options. If the value for "MSS: (EnableDeadGWDetect) Allow automatic detection of dead network gateways (could lead to DoS)" is not set to "Disabled", this is a finding. The policy referenced configures the following registry value: Registry Hive: HKEY_LOCAL_MACHINE Registry Path: \System\CurrentControlSet\Services\Tcpip\Parameters\ Value Name: EnableDeadGWDetect Value Type: REG_DWORD Value: 0

Fix Text (F-53579r2_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "MSS: (EnableDeadGWDetect) Allow automatic detection of dead network gateways (could lead to DoS)" to "Disabled".