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Arista MLS EOS 4.2x Router Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000193-RTR-000112

    <GroupDescription></GroupDescription>
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  • The PE router must be configured to enforce a Quality-of-Service (QoS) policy to limit the effects of packet flooding denial-of-service (DoS) attacks.

    &lt;VulnDiscussion&gt;DoS is a condition when a resource is not available for legitimate users. Packet flooding distributed denial-of-service (DDoS...
    Rule Medium Severity
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  • SRG-NET-000193-RTR-000113

    <GroupDescription></GroupDescription>
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  • The PE router must be configured to enforce a Quality-of-Service (QoS) policy in accordance with the QoS DODIN Technical Profile.

    &lt;VulnDiscussion&gt;Different applications have unique requirements and toleration levels for delay, jitter, bandwidth, packet loss, and availabi...
    Rule Low Severity
    Show

  • SRG-NET-000193-RTR-000114

    <GroupDescription></GroupDescription>
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  • The PE router must be configured to enforce a Quality-of-Service (QoS) policy in accordance with the QoS GIG Technical Profile.

    &lt;VulnDiscussion&gt;Different applications have unique requirements and toleration levels for delay, jitter, bandwidth, packet loss, and availabi...
    Rule Low Severity
    Show

  • SRG-NET-000202-RTR-000001

    <GroupDescription></GroupDescription>
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  • The Arista perimeter router must be configured to deny network traffic by default and allow network traffic by exception.

    &lt;VulnDiscussion&gt;A deny-all, permit-by-exception network communications traffic policy ensures that only connections that are essential and ap...
    Rule High Severity
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  • SRG-NET-000205-RTR-000001

    <GroupDescription></GroupDescription>
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  • The Arista router must be configured to restrict traffic destined to itself.

    &lt;VulnDiscussion&gt;The route processor handles traffic destined to the router, the key component used to build forwarding paths that is also ins...
    Rule High Severity
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  • SRG-NET-000205-RTR-000002

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  • The Arista router must be configured to drop all fragmented Internet Control Message Protocol (ICMP) packets destined to itself.

    &lt;VulnDiscussion&gt;Fragmented ICMP packets can be generated by hackers for DoS attacks such as Ping O' Death and Teardrop. It is imperative that...
    Rule Medium Severity
    Show

  • SRG-NET-000205-RTR-000003

    <GroupDescription></GroupDescription>
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  • The Arista perimeter router must be configured to filter ingress traffic at the external interface on an inbound direction.

    &lt;VulnDiscussion&gt;Access lists are used to separate data traffic into that which it will route (permitted packets) and that which it will not r...
    Rule Medium Severity
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  • SRG-NET-000205-RTR-000005

    <GroupDescription></GroupDescription>
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  • The Arista perimeter router must be configured to filter egress traffic at the internal interface on an inbound direction.

    &lt;VulnDiscussion&gt;Access lists are used to separate data traffic into that which it will route (permitted packets) and that which it will not r...
    Rule Medium Severity
    Show

  • SRG-NET-000205-RTR-000006

    <GroupDescription></GroupDescription>
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  • The Arista router must be configured to block any traffic that is destined to IP core infrastructure.

    &lt;VulnDiscussion&gt;IP/MPLS networks providing VPN and transit services must provide, at the least, the same level of protection against denial-o...
    Rule High Severity
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  • SRG-NET-000205-RTR-000008

    <GroupDescription></GroupDescription>
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  • The Arista router must be configured with Unicast Reverse Path Forwarding (uRPF) loose mode enabled on all CE-facing interfaces.

    &lt;VulnDiscussion&gt;The uRPF feature is a defense against spoofing and denial-of-service (DoS) attacks by verifying if the source address of any ...
    Rule Medium Severity
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  • SRG-NET-000205-RTR-000010

    <GroupDescription></GroupDescription>
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  • The out-of-band management (OOBM) Arista gateway router must be configured to forward only authorized management traffic to the Network Operations Center (NOC).

    &lt;VulnDiscussion&gt;The OOBM network is an IP network used exclusively for the transport of OAM&amp;P data from the network being managed to the ...
    Rule Medium Severity
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  • SRG-NET-000205-RTR-000011

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  • The out-of-band management (OOBM) Arista gateway router must be configured to block any traffic destined to itself that is not sourced from the OOBM network or the NOC.

    &lt;VulnDiscussion&gt;If the gateway router is not a dedicated device for the OOBM network, several safeguards must be implemented for containment ...
    Rule Medium Severity
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  • SRG-NET-000205-RTR-000012

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  • The Arista router must be configured to only permit management traffic that ingresses and egresses the out-of-band management (OOBM) interface.

    &lt;VulnDiscussion&gt;The OOBM access router will connect to the management interface of the managed network elements. The management interface can...
    Rule Medium Severity
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  • SRG-NET-000205-RTR-000014

    <GroupDescription></GroupDescription>
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  • The Arista perimeter 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 (uRPF).

    &lt;VulnDiscussion&gt;A compromised host in an enclave can be used by a malicious platform to launch cyberattacks on third parties. This is a commo...
    Rule High Severity
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  • SRG-NET-000230-RTR-000002

    <GroupDescription></GroupDescription>
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  • The Arista BGP router must be configured to use a unique key for each autonomous system (AS) that it peers with.

    &lt;VulnDiscussion&gt;If the same keys are used between eBGP neighbors, the chance of a hacker compromising any of the BGP sessions increases. It i...
    Rule Medium Severity
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  • SRG-NET-000343-RTR-000001

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  • The PE router providing MPLS Layer 2 Virtual Private Network (L2VPN) services must be configured to authenticate targeted Label Distribution Protocol (LDP) sessions used to exchange virtual circuit (VC) information using a FIPS-approved message authentication code algorithm.

    &lt;VulnDiscussion&gt;LDP provides the signaling required for setting up and tearing down pseudowires (virtual circuits used to transport Layer 2 f...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000109

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  • The Arista router must not be configured to have any zero-touch deployment feature enabled when connected to an operational network.

    &lt;VulnDiscussion&gt;Network devices that are configured via a zero-touch deployment or auto-loading feature can have their startup configuration ...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000111

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  • The Arista router must be configured to have gratuitous ARP disabled on all external interfaces.

    &lt;VulnDiscussion&gt;A gratuitous ARP is an ARP broadcast in which the source and destination MAC addresses are the same. It is used to inform the...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000112

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  • The Arista router must be configured to have IP directed broadcast disabled on all interfaces.

    &lt;VulnDiscussion&gt;An IP-directed broadcast is a datagram sent to the broadcast address of a subnet that is not directly attached to the sending...
    Rule Low Severity
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  • SRG-NET-000362-RTR-000113

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  • The Arista router must be configured to have Internet Control Message Protocol (ICMP) unreachable notifications disabled on all external interfaces.

    &lt;VulnDiscussion&gt;The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000114

    <GroupDescription></GroupDescription>
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  • The Arista router must be configured to have Internet Control Message Protocol (ICMP) mask replies disabled on all external interfaces.

    &lt;VulnDiscussion&gt;The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000115

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  • The Arista router must be configured to have Internet Control Message Protocol (ICMP) redirects disabled on all external interfaces.

    &lt;VulnDiscussion&gt;The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000117

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  • The Arista BGP router must be configured to use the maximum prefixes feature to protect against route table flooding and prefix de-aggregation attacks.

    &lt;VulnDiscussion&gt;The effects of prefix de-aggregation can degrade router performance due to the size of routing tables and also result in blac...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000118

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  • The Arista BGP router must be configured to limit the prefix size on any inbound route advertisement to /24 or the least significant prefixes issued to the customer.

    &lt;VulnDiscussion&gt;The effects of prefix de-aggregation can degrade router performance due to the size of routing tables and also result in blac...
    Rule Low Severity
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  • SRG-NET-000362-RTR-000120

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  • The multicast Rendezvous Point (RP) Arista router must be configured to limit the multicast forwarding cache so that its resources are not saturated by managing an overwhelming number of Protocol Independent Multicast (PIM) and Multicast Source Discovery Protocol (MSDP) source-active entries.

    &lt;VulnDiscussion&gt;MSDP peering between networks enables sharing of multicast source information. Enclaves with an existing multicast topology u...
    Rule Low Severity
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