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Cisco IOS XE Switch RTR Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • The Cisco perimeter switch must be configured to only allow incoming communications from authorized sources to be routed to authorized destinations.

    <VulnDiscussion>Unrestricted traffic may contain malicious traffic that poses a threat to an enclave or to other connected networks. Addition...
    Rule Medium Severity
    Show

  • SRG-NET-000364-RTR-000110

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco perimeter switch must be configured to block inbound packets with source Bogon IP address prefixes.

    &lt;VulnDiscussion&gt;Packets with Bogon IP source addresses should never be allowed to traverse the IP core. Bogon IP networks are RFC1918 address...
    Rule Medium Severity
    Show

  • SRG-NET-000205-RTR-000014

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco perimeter switch 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
    Show

  • SRG-NET-000205-RTR-000003

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco perimeter switch must be configured to filter traffic destined to the enclave in accordance with the guidelines contained in DoD Instruction 8551.1.

    &lt;VulnDiscussion&gt;Vulnerability assessments must be reviewed by the System Administrator, and protocols must be approved by the Information Ass...
    Rule Medium Severity
    Show

  • SRG-NET-000205-RTR-000004

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco BGP switch must be configured to reject inbound route advertisements for any prefixes belonging to the local autonomous system (AS).

    &lt;VulnDiscussion&gt;Accepting route advertisements belonging to the local AS can result in traffic looping or being black-holed, or at a minimum,...
    Rule Medium Severity
    Show

  • SRG-NET-000018-RTR-000004

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco perimeter switch 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
    Show

  • SRG-NET-000205-RTR-000005

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco perimeter switch 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-000015

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco perimeter switch must be configured to block all packets with any IP options.

    &lt;VulnDiscussion&gt;Packets with IP options are not fast switched and henceforth must be punted to the switch processor. Hackers who initiate den...
    Rule Medium Severity
    Show

  • SRG-NET-000364-RTR-000111

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco perimeter switch must be configured to have Link Layer Discovery Protocol (LLDP) disabled on all external interfaces.

    &lt;VulnDiscussion&gt;LLDP is a neighbor discovery protocol used to advertise device capabilities, configuration information, and device identity. ...
    Rule Low Severity
    Show

  • SRG-NET-000364-RTR-000111

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco perimeter switch must be configured to have Cisco Discovery Protocol (CDP) disabled on all external interfaces.

    &lt;VulnDiscussion&gt;CDP is a Cisco proprietary neighbor discovery protocol used to advertise device capabilities, configuration information, and ...
    Rule Low Severity
    Show

  • SRG-NET-000364-RTR-000112

    <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 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 only permit management traffic that ingresses and egresses the out-of-band management (OOBM) interface.

    &lt;VulnDiscussion&gt;The OOBM access switch will connect to the management interface of the managed network elements. The management interface can...
    Rule Medium Severity
    Show

  • SRG-NET-000362-RTR-000124

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco BGP switch must be configured to enable the Generalized TTL Security Mechanism (GTSM).

    &lt;VulnDiscussion&gt;As described in RFC 3682, GTSM is designed to protect a switch's IP-based control plane from DoS attacks. Many attacks focuse...
    Rule Low Severity
    Show

  • SRG-NET-000230-RTR-000002

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco BGP switch 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
    Show

  • SRG-NET-000018-RTR-000002

    <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 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).

    &lt;VulnDiscussion&gt;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 BGP switch 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 switch performance due to the size of routing tables and also result in blac...
    Rule Medium Severity
    Show

  • SRG-NET-000362-RTR-000118

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco BGP switch 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 switch performance due to the size of routing tables and also result in blac...
    Rule Low Severity
    Show

  • SRG-NET-000512-RTR-000001

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco BGP switch must be configured to use its loopback address as the source address for iBGP peering sessions.

    &lt;VulnDiscussion&gt;Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability o...
    Rule Low Severity
    Show

  • SRG-NET-000512-RTR-000002

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco MPLS switch must be configured to use its loopback address as the source address for LDP peering sessions.

    &lt;VulnDiscussion&gt;Using a loopback address as the source address offers a multitude of uses for security, access, management, and scalability o...
    Rule Low Severity
    Show

  • SRG-NET-000512-RTR-000003

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco MPLS switch must be configured to synchronize Interior Gateway Protocol (IGP) and LDP to minimize packet loss when an IGP adjacency is established prior to LDP peers completing label exchange.

    &lt;VulnDiscussion&gt;Packet loss can occur when an IGP adjacency is established and the switch begins forwarding packets using the new adjacency b...
    Rule Low Severity
    Show

  • SRG-NET-000193-RTR-000001

    <GroupDescription></GroupDescription>
    Group
    Show

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