| V-55721 | Medium | The router must enforce approved authorizations for controlling the flow of information between interconnected networks in accordance with applicable policy. | Information flow control regulates authorized information to travel within a network and between interconnected networks. Controlling the flow of network traffic is critical so it does not... |
| V-55723 | Medium | The router must disable Protocol Independent Multicast (PIM) on all interfaces that are not required to support multicast routing. | If multicast traffic is forwarded beyond the intended boundary, it is possible that it can be intercepted by unauthorized or unintended personnel. Limiting where, within the network, a given... |
| V-55727 | Medium | The router must bind a Protocol Independent Multicast (PIM) neighbor filter to interfaces that have PIM enabled. | Protocol Independent Multicast (PIM) is a routing protocol used to build multicast distribution trees for forwarding multicast traffic across the network infrastructure. Protocol Independent... |
| V-55729 | Medium | The router must establish boundaries for IPv6 Admin-Local, IPv6 Site-Local, IPv6 Organization-Local scope, and IPv4 Local-Scope multicast traffic. | If multicast traffic is forwarded beyond the intended boundary, it is possible that it can be intercepted by unauthorized or unintended personnel.
Administrative scoped multicast addresses are... |
| V-55741 | Medium | The router must enforce that Interior Gateway Protocol instances configured on the out-of-band management gateway router only peer with their own routing domain. | If the gateway router is not a dedicated device for the out-of-band management network, implementation of several safeguards for containment of management and production traffic boundaries must... |
| V-55747 | Medium | The router must enforce that the managed network domain and the management network domain are separate routing domains and the Interior Gateway Protocol instances are not redistributed or advertised to each other. | If the gateway router is not a dedicated device for the out-of-band management network, several safeguards must be implemented for containment of management and production traffic boundaries,... |
| V-55749 | Medium | The router must enforce that any interface used for out-of-band management traffic is configured to be passive for the Interior Gateway Protocol that is utilized on that management interface. | The out-of-band management access switch will connect to the management interface of the managed network elements. The management interface can be a true out-of-band management interface or a... |
| V-55773 | Medium | The router must have IP source routing disabled. | Source routing is a feature of IP, whereby individual packets can specify routes. This feature is used in several different network attacks by bypassing perimeter and internal defense mechanisms. |
| V-55771 | Medium | The router must manage excess bandwidth to limit the effects of packet flooding types of denial of service (DoS) attacks. | Denial of service is a condition when a resource is not available for legitimate users. Packet flooding DDoS attacks are referred to as volumetric attacks and have the objective of overloading a... |
| V-55777 | Medium | The router must configure the maximum hop limit value to at least 32. | The Neighbor Discovery protocol allows a hop limit value to be advertised by routers in a Router Advertisement message to be used by hosts instead of the standardized default value. If a very... |
| V-55775 | Medium | The router must restrict BGP connections to known IP addresses of neighbor routers from trusted Autonomous Systems (AS). | Advertisement of routes by an Autonomous System for networks that do not belong to any of its trusted peers pulls traffic away from the authorized network. This causes a DoS on the network that... |
| V-55779 | Medium | The router must stop forwarding traffic or maintain the configured security policies upon the failure of the following actions: system initialization, shutdown, or system abort. | Failure to a known safe state helps prevent systems from failing to a state that may cause loss of data or unauthorized access to system resources. Network elements that fail suddenly and with no... |
| V-55791 | Medium | The router must be configured in accordance with the security configuration settings based on DoD security configuration or implementation guidance, including NSA configuration guides, Communications Tasking Orders (CTOs), and Directive-Type Memorandums (DTMs). | If the router does not follow established security guidance, it is likely that it is not adequately secured, which increases the risk. Configuring the router to implement organization-wide... |
| V-55759 | Medium | The router must be configured so that any key used for authenticating Interior Gateway Protocol peers does not have a duration exceeding 180 days. | If the keys used for routing protocol authentication are guessed, the malicious user could create havoc within the network by advertising incorrect routes and redirecting traffic. Some routing... |
| V-55735 | Medium | If Border Gateway Protocol (BGP) is enabled on the router, the router must not be a BGP peer with a router from an Autonomous System belonging to any Alternate Gateway. | The perimeter router will not use a routing protocol to advertise NIPRNet addresses to Alternate Gateways. Most ISPs use Border Gateway Protocol (BGP) to share route information with other... |
| V-55763 | Medium | The router must be configured to disable non-essential capabilities. | A compromised router introduces risk to the entire network infrastructure as well as data resources that are accessible via the network. The perimeter defense has no oversight or control of... |
| V-55739 | Medium | The router must not redistribute static routes to alternate gateway service provider into an Exterior Gateway Protocol or Interior Gateway Protocol to the NIPRNet or to other Autonomous System. | If the static routes to the alternate gateway are being redistributed into an Exterior Gateway Protocol or Interior Gateway Protocol to a NIPRNet gateway, this could make traffic on NIPRNet flow... |
| V-55753 | Medium | The router must enforce information flow control using explicit security attributes (for example, IP addresses, port numbers, protocol, Autonomous System, or interface) on information, source, and destination objects. | Information flow control regulates where information is allowed to travel within a network and between interconnected networks. The flow of all network traffic must be monitored and controlled so... |
| V-55733 | Medium | The router must protect an enclave connected to an Alternate Gateway by using an inbound filter that only permits packets with destination addresses within the sites address space. | Enclaves with Alternate Gateway connections must take additional steps to ensure there is no compromise on the enclave network or NIPRNet. Without verifying the destination address of traffic... |
| V-55757 | Medium | The router must enable neighbor router authentication for control plane protocols. | A rogue router could send a fictitious routing update to convince a site's perimeter router to send traffic to an incorrect or even a rogue destination. This diverted traffic could be analyzed to... |
| V-55731 | Medium | The router must be configured so inactive router interfaces are disabled. | An inactive interface is rarely monitored or controlled and may expose a network to an undetected attack on that interface. Unauthorized personnel with access to the communication facility could... |
| V-55765 | Medium | The router must encrypt all methods of configured authentication for routing protocols. | A rogue router could send a fictitious routing update to convince a site's perimeter router to send traffic to an incorrect or even a rogue destination. This diverted traffic could be analyzed to... |
| V-55767 | Medium | The router must use NIST-validated FIPS 140-2 cryptography to implement authentication encryption mechanisms for routing protocols. | A rogue router could send a fictitious routing update to convince a site's perimeter router to send traffic to an incorrect or even a rogue destination. This diverted traffic could be analyzed to... |
| V-55761 | Medium | The router must be configured to restrict it from accepting outbound IP packets that contain an illegitimate address in the source address field via egress filter or by enabling Unicast Reverse Path Forwarding. | A compromised host in an enclave can be used by a malicious actor as a platform to launch cyber attacks on third parties. This is a common practice in "botnets", which are a collection of... |
| V-55789 | Medium | The router must fail securely in the event of an operational failure. | If the router fails in an unsecure manner (open), unauthorized traffic originating externally to the enclave may enter, or the device may permit unauthorized information release. Fail secure is a... |
| V-55785 | Medium | The router must only allow incoming communications from authorized sources to be routed to authorized destinations. | Unrestricted traffic may contain malicious traffic that poses a threat to an enclave or to other connected networks. Additionally, unrestricted traffic may transit a network, which uses bandwidth... |
| V-55769 | Medium | The router must ensure all Exterior Border Gateway Protocol (eBGP) routers are configured to use Generalized TTL Security Mechanism (GTSM). | As described in RFC 3682, Generalized TTL Security Mechanism (GTSM) is designed to protect a router's IP-based control plane from DoS attacks. Many attacks focused on CPU load and line-card... |
| V-55781 | Medium | The router must protect against or limit the effects of denial of service (DoS) attacks by employing control plane protection. | The Route Processor (RP) is critical to all network operations because it is the component used to build all forwarding paths for the data plane via control plane processes. It is also... |
