Title

The system must be configured to disable the Internet Router Discovery Protocol (IRDP). (Cat III impact)

Discussion

The Internet Router Discovery Protocol (IRDP) is used to detect and configure default gateway addresses on the computer. If a router is impersonated on a network, traffic could be routed through the compromised system.

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: \System\CurrentControlSet\Services\Tcpip\Parameters\ Value Name: PerformRouterDiscovery Value Type: REG_DWORD Value: 0

Fix Text

Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options -> "MSS: (PerformRouterDiscovery) Allow IRDP to detect and configure Default Gateway addresses (could lead to DoS)" 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.)

Additional Identifiers

Rule ID: SV-225485r852256_rule

Vulnerability ID: V-225485

Group Title: SRG-OS-000420-GPOS-00186

Expert Comments

CCIs tied to check.

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