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The system must be configured to prevent Internet Control Message Protocol (ICMP) redirects from overriding Open Shortest Path First (OSPF) generated routes.


Overview

Finding ID Version Rule ID IA Controls Severity
WN12-SO-000039 WN12-SO-000039 WN12-SO-000039_rule Low
Description
Allowing ICMP redirect of routes can lead to traffic not being routed properly. When disabled, this forces ICMP to be routed via shortest path first.
STIG Date
Microsoft Windows Server 2012 Domain Controller Security Technical Implementation Guide 2013-07-25

Details

Check Text ( C-WN12-SO-000039_chk )
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: \System\CurrentControlSet\Services\Tcpip\Parameters\

Value Name: EnableICMPRedirect

Value Type: REG_DWORD
Value: 0
Fix Text (F-WN12-SO-000039_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "MSS: (EnableICMPRedirect) Allow ICMP redirects to override OSPF generated routes" to "Disabled".

(See "Updating the Windows Security Options File" in the STIG Overview document if MSS settings are not visible in the system's policy tools.)