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Router Security Requirements Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000205

    <GroupDescription></GroupDescription>
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  • SRG-NET-000018

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  • The 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.

    &lt;VulnDiscussion&gt;Information flow control regulates where information is allowed to travel within a network and between interconnected network...
    Rule Medium Severity
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  • SRG-NET-000018

    <GroupDescription></GroupDescription>
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  • The 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
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  • SRG-NET-000018

    <GroupDescription></GroupDescription>
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  • The 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
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  • SRG-NET-000018

    <GroupDescription></GroupDescription>
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  • The 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

    <GroupDescription></GroupDescription>
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  • The 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-000018

    <GroupDescription></GroupDescription>
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  • The 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

    <GroupDescription></GroupDescription>
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  • The Multicast Source Discovery Protocol (MSDP) router must be configured to filter received source-active multicast advertisements for any undesirable multicast groups and sources.

    &lt;VulnDiscussion&gt;The interoperability of BGP extensions for interdomain multicast routing and MSDP enables seamless connectivity of multicast ...
    Rule Low Severity
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  • SRG-NET-000018

    <GroupDescription></GroupDescription>
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  • The Multicast Source Discovery Protocol (MSDP) router must be configured to filter source-active multicast advertisements to external MSDP peers to avoid global visibility of local-only multicast sources and groups.

    &lt;VulnDiscussion&gt;To avoid global visibility of local information, there are a number of source-group (S, G) states in a PIM-SM domain that mus...
    Rule Low Severity
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  • SRG-NET-000018

    <GroupDescription></GroupDescription>
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  • The MSDP router must be configured to limit the amount of source-active messages it accepts on per-peer basis.

    &lt;VulnDiscussion&gt;To reduce any risk of a denial-of-service (DoS) attack from a rogue or misconfigured MSDP router, the router must be configur...
    Rule Low Severity
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  • SRG-NET-000018

    <GroupDescription></GroupDescription>
    Group
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  • The 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
    Show

  • SRG-NET-000019

    <GroupDescription></GroupDescription>
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  • The router must be configured to disable the auxiliary port unless it is connected to a secured modem providing encryption and authentication.

    &lt;VulnDiscussion&gt;The use of POTS lines to modems connecting to network devices provides clear text of authentication traffic over commercial c...
    Rule Low Severity
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  • SRG-NET-000019

    <GroupDescription></GroupDescription>
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  • The perimeter router 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
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  • SRG-NET-000019

    <GroupDescription></GroupDescription>
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  • The multicast router must be configured to disable Protocol Independent Multicast (PIM) on all interfaces that are not required to support multicast routing.

    &lt;VulnDiscussion&gt;If multicast traffic is forwarded beyond the intended boundary, it is possible that it can be intercepted by unauthorized or ...
    Rule Medium Severity
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  • SRG-NET-000019

    <GroupDescription></GroupDescription>
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  • The multicast router must be configured to bind a Protocol Independent Multicast (PIM) neighbor filter to interfaces that have PIM enabled.

    &lt;VulnDiscussion&gt;PIM is a routing protocol used to build multicast distribution trees for forwarding multicast traffic across the network infr...
    Rule Medium Severity
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  • SRG-NET-000019

    <GroupDescription></GroupDescription>
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  • The out-of-band management (OOBM) gateway router must be configured to have separate 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
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  • The multicast edge router must be configured to establish boundaries for administratively scoped multicast traffic.

    &lt;VulnDiscussion&gt;If multicast traffic is forwarded beyond the intended boundary, it is possible that it can be intercepted by unauthorized or ...
    Rule Low Severity
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  • SRG-NET-000019

    <GroupDescription></GroupDescription>
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  • The router must be configured to have all inactive 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
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  • SRG-NET-000019

    <GroupDescription></GroupDescription>
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  • The perimeter router must be configured to protect an enclave connected to an alternate gateway by using an inbound filter that only permits packets with destination addresses within the sites address space.

    &lt;VulnDiscussion&gt;Enclaves with alternate gateway connections must take additional steps to ensure there is no compromise on the enclave networ...
    Rule High Severity
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  • SRG-NET-000019

    <GroupDescription></GroupDescription>
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  • The perimeter router must be configured to not be a Border Gateway Protocol (BGP) peer to an alternate gateway service provider.

    &lt;VulnDiscussion&gt; ISPs use BGP to share route information with other autonomous systems (i.e. other ISPs and corporate networks). If the perim...
    Rule High Severity
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  • SRG-NET-000019

    <GroupDescription></GroupDescription>
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  • The perimeter router must be configured to not redistribute static routes to an alternate gateway service provider into BGP or an IGP peering with the NIPRNet or to other autonomous systems.

    &lt;VulnDiscussion&gt;If the static routes to the alternate gateway are being redistributed into an Exterior Gateway Protocol or Interior Gateway P...
    Rule Low Severity
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  • SRG-NET-000019

    <GroupDescription></GroupDescription>
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  • SRG-NET-000019

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  • The 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
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  • SRG-NET-000019

    <GroupDescription></GroupDescription>
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  • The multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Register messages received from the Designated Router (DR) for any undesirable multicast groups and sources.

    &lt;VulnDiscussion&gt;Real-time multicast traffic can entail multiple large flows of data. An attacker can flood a network segment with multicast p...
    Rule Low Severity
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  • SRG-NET-000019

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  • The multicast Rendezvous Point (RP) router must be configured to filter Protocol Independent Multicast (PIM) Join messages received from the Designated Router (DR) for any undesirable multicast groups.

    &lt;VulnDiscussion&gt;Real-time multicast traffic can entail multiple large flows of data. An attacker can flood a network segment with multicast p...
    Rule Low Severity
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  • SRG-NET-000076

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  • The router must be configured to produce audit records containing information to establish where the events occurred.

    &lt;VulnDiscussion&gt;Without establishing where events occurred, it is impossible to establish, correlate, and investigate the events leading up t...
    Rule Medium Severity
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  • SRG-NET-000077

    <GroupDescription></GroupDescription>
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