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Cisco NX OS Switch RTR Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • The Cisco BGP switch must be configured to reject outbound route advertisements for any prefixes that do not belong to any customers or the local autonomous system (AS).

    <VulnDiscussion>Advertisement of routes by an autonomous system for networks that do not belong to any of its customers pulls traffic away fr...
    Rule Medium Severity
    Show

  • SRG-NET-000205-RTR-000006

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco BGP switch must be configured to reject outbound route advertisements for any prefixes belonging to the IP core.

    &lt;VulnDiscussion&gt;Outbound route advertisements belonging to the core can result in traffic either looping or being black holed, or at a minimu...
    Rule Medium Severity
    Show

  • SRG-NET-000018-RTR-000006

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco BGP switch must be configured to reject route advertisements from BGP peers that do not list their autonomous system (AS) number as the first AS in the AS_PATH attribute.

    &lt;VulnDiscussion&gt;Verifying the path a route has traversed will ensure the IP core is not used as a transit network for unauthorized or possibl...
    Rule Low Severity
    Show

  • SRG-NET-000018-RTR-000010

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco BGP switch must be configured to reject route advertisements from CE switches with an originating AS in the AS_PATH attribute that does not belong to that customer.

    &lt;VulnDiscussion&gt;Verifying the path a route has traversed will ensure that the local AS is not used as a transit network for unauthorized traf...
    Rule Low Severity
    Show

  • SRG-NET-000362-RTR-000117

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco PE switch must be configured to have each Virtual Routing and Forwarding (VRF) instance with the appropriate Route Target (RT).

    &lt;VulnDiscussion&gt;The primary security model for an MPLS L3VPN as well as a VRF-lite infrastructure is traffic separation. Each interface can o...
    Rule High Severity
    Show

  • SRG-NET-000512-RTR-000007

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco perimeter switch must be configured to have Proxy ARP disabled on all external interfaces.

    &lt;VulnDiscussion&gt;When Proxy ARP is enabled on a switch, it allows that switch to extend the network (at Layer 2) across multiple interfaces (L...
    Rule Medium Severity
    Show

  • SRG-NET-000364-RTR-000113

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must be configured to implement message authentication for all control plane protocols.

    &lt;VulnDiscussion&gt;A rogue switch could send a fictitious routing update to convince a site's perimeter switch to send traffic to an incorrect o...
    Rule Medium Severity
    Show

  • SRG-NET-000230-RTR-000003

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco perimeter switch must be configured to block all outbound management traffic.

    &lt;VulnDiscussion&gt;For in-band management, the management network must have its own subnet in order to enforce control and access boundaries pro...
    Rule Medium Severity
    Show

  • SRG-NET-000205-RTR-000012

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must be configured to protect against or limit the effects of denial-of-service (DoS) attacks by employing control plane protection.

    &lt;VulnDiscussion&gt;The Route Processor (RP) is critical to all network operations because it is the component used to build all forwarding paths...
    Rule Medium Severity
    Show

  • SRG-NET-000205-RTR-000001

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must be configured to restrict traffic destined to itself.

    &lt;VulnDiscussion&gt;The route processor handles traffic destined to the switch—the key component used to build forwarding paths and is instrument...
    Rule High Severity
    Show

  • SRG-NET-000205-RTR-000002

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch 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-000362-RTR-000111

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch 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
    Show

  • SRG-NET-000362-RTR-000112

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco perimeter switch must be configured to enforce approved authorizations for controlling the flow of information between interconnected networks in accordance with applicable policy.

    &lt;VulnDiscussion&gt;Information flow control regulates authorized information to travel within a network and between interconnected networks. Con...
    Rule Medium Severity
    Show

  • SRG-NET-000364-RTR-000109

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco BGP switch must be configured to reject inbound route advertisements from a customer edge (CE) switch for prefixes that are not allocated to that customer.

    &lt;VulnDiscussion&gt;As a best practice, a service provider should only accept customer prefixes that have been assigned to that customer and any ...
    Rule Medium Severity
    Show

  • SRG-NET-000018-RTR-000005

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco PE switch must be configured to implement Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD) snooping for each Virtual Private LAN Services (VPLS) bridge domain.

    &lt;VulnDiscussion&gt;IGMP snooping provides a way to constrain multicast traffic at Layer 2. By monitoring the IGMP membership reports sent by hos...
    Rule Low Severity
    Show

  • SRG-NET-000192-RTR-000002

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must not be configured to have any feature enabled that calls home to the vendor.

    &lt;VulnDiscussion&gt;Call home services will routinely send data such as configuration and diagnostic information to the vendor for routine or eme...
    Rule Medium Severity
    Show

  • SRG-NET-000362-RTR-000110

    <GroupDescription></GroupDescription>
    Group
    Show

  • SRG-NET-000230-RTR-000001

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must be configured to use keys with a duration not exceeding 180 days for authenticating routing protocol messages.

    &lt;VulnDiscussion&gt;If the keys used for routing protocol authentication are guessed, the malicious user could create havoc within the network by...
    Rule Medium Severity
    Show

  • SRG-NET-000168-RTR-000077

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must be configured to use encryption for routing protocol authentication.

    &lt;VulnDiscussion&gt;A rogue switch could send a fictitious routing update to convince a site's perimeter switch to send traffic to an incorrect o...
    Rule Medium Severity
    Show

  • SRG-NET-000168-RTR-000078

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must be configured to authenticate all routing protocol messages using NIST-validated FIPS 198-1 message authentication code algorithm.

    &lt;VulnDiscussion&gt;A rogue switch could send a fictitious routing update to convince a site's perimeter switch to send traffic to an incorrect o...
    Rule Medium Severity
    Show

  • SRG-NET-000019-RTR-000007

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must be configured to have all inactive layer 3 interfaces disabled.

    &lt;VulnDiscussion&gt;An inactive interface is rarely monitored or controlled and may expose a network to an undetected attack on that interface. U...
    Rule Low Severity
    Show

  • SRG-NET-000131-RTR-000083

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch 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
    Show

  • SRG-NET-000362-RTR-000113

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) unreachable messages disabled on all external interfaces.

    &lt;VulnDiscussion&gt;The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Switches automatically send...
    Rule Medium Severity
    Show

  • SRG-NET-000362-RTR-000115

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) redirect messages disabled on all external interfaces.

    &lt;VulnDiscussion&gt;The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Switches automatically send...
    Rule Medium Severity
    Show

  • SRG-NET-000078-RTR-000001

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must be configured to log all packets that have been dropped at interfaces via an ACL.

    &lt;VulnDiscussion&gt;Auditing and logging are key components of any security architecture. It is essential for security personnel to know what is ...
    Rule Low Severity
    Show

  • SRG-NET-000202-RTR-000001

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco perimeter switch 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
    Show

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