Title

The system is configured to redirect ICMP. (Cat III impact)

Discussion

When disabled, forces ICMP to be routed via shortest path first.

Check Content

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: (EnableICMPRedirect) Allow ICMP redirects to override OSPF generated routes” is not set to “Disabled”, then 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: EnableICMPRedirect Value Type: REG_DWORD Value: 0

Fix Text

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”.

Additional Identifiers

Rule ID: SV-4111r1_rule

Vulnerability ID: V-4111

Group Title: Disable ICMP Redirect

Expert Comments

CCIs tied to check.

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