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II - Mission Support Public

Rules and Groups employed by this XCCDF Profile

  • SRG-NET-000364-RTR-000112

    <GroupDescription></GroupDescription>
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  • 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
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  • SRG-NET-000364-RTR-000113

    <GroupDescription></GroupDescription>
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  • 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
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  • SRG-NET-000205-RTR-000012

    <GroupDescription></GroupDescription>
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  • 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
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  • SRG-NET-000362-RTR-000124

    <GroupDescription></GroupDescription>
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  • The Cisco BGP switch must be configured to check whether a single-hop eBGP peer is directly connected.

    &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
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  • SRG-NET-000230-RTR-000002

    <GroupDescription></GroupDescription>
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  • 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
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  • SRG-NET-000018-RTR-000002

    <GroupDescription></GroupDescription>
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  • The Cisco BGP switch 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-RTR-000003

    <GroupDescription></GroupDescription>
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  • 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
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  • SRG-NET-000018-RTR-000004

    <GroupDescription></GroupDescription>
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  • 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
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  • SRG-NET-000018-RTR-000005

    <GroupDescription></GroupDescription>
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  • 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
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  • SRG-NET-000205-RTR-000006

    <GroupDescription></GroupDescription>
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  • 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
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  • SRG-NET-000018-RTR-000006

    <GroupDescription></GroupDescription>
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  • 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
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  • SRG-NET-000018-RTR-000010

    <GroupDescription></GroupDescription>
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  • 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
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  • SRG-NET-000362-RTR-000117

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  • 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
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  • SRG-NET-000362-RTR-000118

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  • 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
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  • SRG-NET-000512-RTR-000001

    <GroupDescription></GroupDescription>
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  • 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
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  • SRG-NET-000512-RTR-000002

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  • 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
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  • SRG-NET-000512-RTR-000003

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  • 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
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  • SRG-NET-000193-RTR-000001

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  • The MPLS switch 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 switches.

    &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

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  • The Cisco MPLS switch must be configured to have TTL Propagation disabled.

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

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  • The Cisco PE switch 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

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  • 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
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  • SRG-NET-000512-RTR-000007

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  • The Cisco PE switch must be configured to have each VRF with the appropriate Route Distinguisher (RD).

    &lt;VulnDiscussion&gt;An RD provides uniqueness to the customer address spaces within the MPLS L3VPN infrastructure. The concept of the VPN-IPv4 an...
    Rule Medium Severity
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  • SRG-NET-000343-RTR-000001

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  • The Cisco PE switch 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-000512-RTR-000008

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  • The Cisco PE switch providing MPLS Virtual Private Wire Service (VPWS) must be configured to have the appropriate virtual circuit identification (VC ID) for each attachment circuit.

    &lt;VulnDiscussion&gt;VPWS is an L2VPN technology that provides a virtual circuit between two PE switches to forward Layer 2 frames between two cus...
    Rule High Severity
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  • SRG-NET-000512-RTR-000009

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  • The Cisco PE switch providing Virtual Private LAN Services (VPLS) must be configured to have all attachment circuits defined to the virtual forwarding instance (VFI) with the globally unique VPN ID assigned for each customer VLAN.

    &lt;VulnDiscussion&gt;VPLS defines an architecture that delivers Ethernet multipoint services over an MPLS network. Customer Layer 2 frames are for...
    Rule High Severity
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