I - Mission Critical Classified
Rules and Groups employed by this XCCDF Profile
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SRG-NET-000362-RTR-000123
Group -
The Arista multicast Designated Router (DR) must be configured to increase the shortest-path tree (SPT) threshold or set it to infinity to minimalize source-group (S, G) state within the multicast topology where Any Source Multicast (ASM) is deployed.
ASM can have many sources for the same groups (many-to-many). For many receivers, the path via the RP may not be ideal compared with the shortest path from the source to the receiver. By default, t...Rule Medium Severity -
SRG-NET-000362-RTR-000124
Group -
The Arista BGP router must be configured to enable the Generalized TTL Security Mechanism (GTSM).
GTSM is designed to protect a router's IP-based control plane from DoS attacks. Many attacks focused on CPU load and line-card overload can be prevented by implementing GTSM on all Exterior Border ...Rule Low Severity -
SRG-NET-000364-RTR-000109
Group -
The Arista perimeter router must be configured to 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 a...Rule Medium Severity -
SRG-NET-000364-RTR-000110
Group -
The Arista perimeter router must be configured to block inbound packets with source Bogon IP address prefixes.
Bogons include IP packets on the public internet that contain addresses that are not in any range allocated or delegated by the Internet Assigned Numbers Authority (IANA) or a delegated regional in...Rule Medium Severity -
SRG-NET-000364-RTR-000111
Group -
The Arista perimeter router must be configured to have Link Layer Discovery Protocols (LLDPs) disabled on all external interfaces.
LLDPs are primarily used to obtain protocol addresses of neighboring devices and discover platform capabilities of those devices. Use of SNMP with the LLDP Management Information Base (MIB) allows ...Rule Low Severity -
SRG-NET-000364-RTR-000112
Group -
The Arista perimeter router must be configured to have Proxy ARP disabled on all external interfaces.
When Proxy ARP is enabled on a Cisco router, it allows that router to extend the network (at Layer 2) across multiple interfaces (LAN segments). Because proxy ARP allows hosts from different LAN se...Rule Medium Severity -
SRG-NET-000364-RTR-000113
Group -
The Arista perimeter router must be configured to block all outbound management traffic.
For in-band management, the management network must have its own subnet in order to enforce control and access boundaries provided by Layer 3 network nodes, such as routers and firewalls. Managemen...Rule Medium Severity -
SRG-NET-000364-RTR-000114
Group -
The Arista multicast Designated Router (DR) must be configured to filter the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Report messages to allow hosts to join only multicast groups that have been approved by the organization.
Real-time multicast traffic can entail multiple large flows of data. Large unicast flows tend to be fairly isolated (i.e., someone doing a file download here or there), whereas multicast can have b...Rule Low Severity -
SRG-NET-000364-RTR-000115
Group -
The Arista multicast Designated Router (DR) must be configured to filter the Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Report messages to allow hosts to join a multicast group only from sources that have been approved by the organization.
Real-time multicast traffic can entail multiple large flows of data. Large unicast flows tend to be fairly isolated (i.e., someone doing a file download here or there), whereas multicast can have b...Rule Medium Severity -
SRG-NET-000364-RTR-000116
Group -
The Arista Multicast Source Discovery Protocol (MSDP) router must be configured to only accept MSDP packets from known MSDP peers.
MSDP peering with customer network routers presents additional risks to the DISN Core, whether from a rogue or misconfigured MSDP-enabled router. To guard against an attack from malicious MSDP traf...Rule Medium Severity -
SRG-NET-000512-RTR-000001
Group -
The Arista BGP router must be configured to use its loopback address as the source address for iBGP peering sessions.
Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability of the BGP routers. It is easier to construct appropriate ingress filters...Rule Low Severity -
SRG-NET-000512-RTR-000002
Group -
The MPLS router must be configured to use its loopback address as the source address for LDP peering sessions.
Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability of backbone routers. It is easier to construct appropriate ingress filter...Rule Low Severity -
SRG-NET-000512-RTR-000003
Group -
The MPLS router must be configured to synchronize IGP and LDP to minimize packet loss when an IGP adjacency is established prior to LDP peers completing label exchange.
Packet loss can occur when an IGP adjacency is established and the router begins forwarding packets using the new adjacency before the LDP label exchange completes between the peers on that link. P...Rule Low Severity -
SRG-NET-000512-RTR-000004
Group -
The MPLS router must be configured to have TTL propagation disabled.
The head end of the label-routered path (LSP), the label edge router (LER) will decrement the IP packet's time-to-live (TTL) value by one and then copy the value to the MPLS TTL field. At each labe...Rule Medium Severity -
SRG-NET-000512-RTR-000005
Group -
The PE router must be configured to have each Virtual Routing and Forwarding (VRF) instance bound to the appropriate physical or logical interfaces to maintain traffic separation between all MPLS L3VPNs.
The primary security model for an MPLS L3VPN infrastructure is traffic separation. The service provider must guarantee the customer that traffic from one VPN does not leak into another VPN or into ...Rule High Severity -
SRG-NET-000512-RTR-000006
Group -
The PE router must be configured to have each Virtual Routing and Forwarding (VRF) instance with the appropriate Route Target (RT).
The primary security model for an MPLS L3VPN as well as a VRF-lite infrastructure is traffic separation. Each interface can only be associated to one VRF, which is the fundamental framework for tra...Rule High Severity -
SRG-NET-000512-RTR-000007
Group -
The PE router must be configured to have each VRF with the appropriate Route Distinguisher (RD).
An RD provides uniqueness to the customer address spaces within the MPLS L3VPN infrastructure. The concept of the VPN-IPv4 and VPN-IPv6 address families consists of the RD prepended before the IP a...Rule Medium Severity -
SRG-NET-000512-RTR-000008
Group -
The PE router providing MPLS Virtual Private Wire Service (VPWS) must be configured to have the appropriate virtual circuit identification (VC ID) for each attachment circuit.
VPWS is an L2VPN technology that provides a virtual circuit between two PE routers to forward Layer 2 frames between two customer-edge routers or routers through an MPLS-enabled IP core. The ingres...Rule High Severity -
SRG-NET-000512-RTR-000011
Group -
The Arista Multicast Source Discovery Protocol (MSDP) router must be configured to use its loopback address as the source address when originating MSDP traffic.
Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability of MSDP routers. It is easier to construct appropriate ingress filters fo...Rule Low Severity -
SRG-NET-000512-RTR-000012
Group -
The Arista router must be configured to advertise a hop limit of at least 32 in Router Advertisement messages for IPv6 stateless auto-configuration deployments.
The Neighbor Discovery protocol allows a hop limit value to be advertised by routers in a Router Advertisement message being used by hosts instead of the standardized default value. If a very small...Rule Low Severity -
SRG-NET-000512-RTR-000013
Group -
The Arista router must not be configured to use IPv6 Site Local Unicast addresses.
As currently defined, site local addresses are ambiguous and can be present in multiple sites. The address itself does not contain any indication of the site to which it belongs. The use of site-lo...Rule Medium Severity -
SRG-NET-000512-RTR-000014
Group -
The Arista perimeter router must be configured to suppress Router Advertisements on all external IPv6-enabled interfaces.
Many of the known attacks in stateless autoconfiguration are defined in RFC 3756 were present in IPv4 ARP attacks. To mitigate these vulnerabilities, links that have no hosts connected such as the ...Rule Medium Severity -
SRG-NET-000205-RTR-000015
Group -
The perimeter router must be configured to block all packets with any IP options.
Packets with IP options are not fast routered and henceforth must be punted to the router processor. Hackers who initiate denial-of-service (DoS) attacks on routers commonly send large streams of p...Rule Medium Severity -
SRG-NET-000205-RTR-000016
Group -
The PE router must be configured to ignore or block all packets with any IP options.
Packets with IP options are not fast routered and therefore must be punted to the router processor. Hackers who initiate denial-of-service (DoS) attacks on routers commonly send large streams of pa...Rule Medium Severity -
SRG-NET-000018-RTR-000001
Group -
The Arista router must be configured to enforce approved authorizations for controlling the flow of information within the network based on organization-defined information flow control policies.
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 i...Rule Medium Severity
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