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Cisco IOS XE Router RTR Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000364-RTR-000111

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco perimeter router 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
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  • The Cisco perimeter router 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>
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  • The Cisco out-of-band management (OOBM) gateway router must be configured to transport management traffic to the Network Operations Center (NOC) via dedicated circuit, MPLS/VPN service, or IPsec tunnel.

    &lt;VulnDiscussion&gt;Using dedicated paths, the OOBM backbone connects the OOBM gateway routers located at the edge of the managed network and at ...
    Rule Medium Severity
    Show

  • SRG-NET-000205-RTR-000010

    <GroupDescription></GroupDescription>
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  • The Cisco out-of-band management (OOBM) 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
    Show

  • SRG-NET-000019-RTR-000011

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco out-of-band management (OOBM) gateway router must be configured to have separate Interior Gateway Protocol (IGP) instances for the managed network and management network.

    &lt;VulnDiscussion&gt;If the gateway router is not a dedicated device for the OOBM network, implementation of several safeguards for containment of...
    Rule Medium Severity
    Show

  • SRG-NET-000019-RTR-000012

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco out-of-band management (OOBM) gateway router must be configured to not redistribute routes between the management network routing domain and the managed network routing domain.

    &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
    Show

  • SRG-NET-000205-RTR-000011

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco out-of-band management (OOBM) gateway router must be configured to block any traffic destined to itself that is not sourced from the OOBM network or the Network Operations Center (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
    Show

  • SRG-NET-000205-RTR-000012

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco 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 switch will connect to the management interface of the managed network elements. The management interface can...
    Rule Medium Severity
    Show

  • SRG-NET-000205-RTR-000013

    <GroupDescription></GroupDescription>
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  • The Cisco router providing connectivity to the Network Operations Center (NOC) must be configured to forward all in-band management traffic via an IPsec tunnel.

    &lt;VulnDiscussion&gt;When the production network is managed in-band, the management network could be housed at a NOC that is located remotely at s...
    Rule Medium Severity
    Show

  • SRG-NET-000018-RTR-000002

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco BGP router must be configured to reject inbound route advertisements for any Bogon prefixes.

    &lt;VulnDiscussion&gt;Accepting route advertisements for Bogon prefixes can result in the local autonomous system (AS) becoming a transit for malic...
    Rule Medium Severity
    Show

  • SRG-NET-000018-RTR-000003

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco BGP router 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>
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  • The Cisco BGP router must be configured to reject inbound route advertisements from a customer edge (CE) router 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
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  • SRG-NET-000018-RTR-000005

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco BGP router 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
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  • SRG-NET-000205-RTR-000006

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco BGP router 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
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  • SRG-NET-000018-RTR-000006

    <GroupDescription></GroupDescription>
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  • The Cisco BGP router 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
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  • SRG-NET-000018-RTR-000010

    <GroupDescription></GroupDescription>
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  • The Cisco BGP router must be configured to reject route advertisements from CE routers 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
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  • SRG-NET-000362-RTR-000117

    <GroupDescription></GroupDescription>
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  • The Cisco 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

    <GroupDescription></GroupDescription>
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  • The Cisco 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
    Show

  • SRG-NET-000512-RTR-000001

    <GroupDescription></GroupDescription>
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  • The Cisco BGP router 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
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  • SRG-NET-000512-RTR-000002

    <GroupDescription></GroupDescription>
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  • The Cisco MPLS router 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
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  • SRG-NET-000512-RTR-000003

    <GroupDescription></GroupDescription>
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  • The Cisco MPLS router 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 router begins forwarding packets using the new adjacency b...
    Rule Low Severity
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  • SRG-NET-000193-RTR-000001

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  • The MPLS router with RSVP-TE enabled must be configured with message pacing to adjust maximum burst and maximum number of RSVP messages to an output queue based on the link speed and input queue size of adjacent core routers.

    &lt;VulnDiscussion&gt;RSVP-TE can be used to perform constraint-based routing when building LSP tunnels within the network core that will support Q...
    Rule Low Severity
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  • SRG-NET-000512-RTR-000004

    <GroupDescription></GroupDescription>
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  • The Cisco MPLS router must be configured to have TTL Propagation disabled.

    &lt;VulnDiscussion&gt;The head end of the label-switched path (LSP), the label edge router (LER) will decrement the IP packet's time-to-live (TTL) ...
    Rule Medium Severity
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  • SRG-NET-000512-RTR-000005

    <GroupDescription></GroupDescription>
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  • The Cisco 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.

    &lt;VulnDiscussion&gt;The primary security model for an MPLS L3VPN infrastructure is traffic separation. The service provider must guarantee the cu...
    Rule High Severity
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  • SRG-NET-000512-RTR-000006

    <GroupDescription></GroupDescription>
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  • The Cisco PE router 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
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Node 2

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