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Cisco IOS XE Router RTR Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000343-RTR-000002

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco Multicast Source Discovery Protocol (MSDP) router must be configured to authenticate all received MSDP packets.

    &lt;VulnDiscussion&gt;MSDP peering with customer network routers presents additional risks to the core, whether from a rogue or misconfigured MSDP-...
    Rule Medium Severity
    Show

  • SRG-NET-000018-RTR-000007

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco 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-RTR-000008

    <GroupDescription></GroupDescription>
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  • The Cisco 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-RTR-000009

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco Multicast Source Discovery Protocol (MSDP) router must be configured to limit the amount of source-active messages it accepts on a 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
    Show

  • SRG-NET-000512-RTR-000011

    <GroupDescription></GroupDescription>
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  • The Cisco Multicast Source Discovery Protocol (MSDP) router must be configured to use a loopback address as the source address when originating MSDP traffic.

    &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-000205-RTR-000014

    <GroupDescription></GroupDescription>
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  • The Cisco perimeter router 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-000015

    <GroupDescription></GroupDescription>
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  • The Cisco perimeter router 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 router processor. Hackers who initiate den...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000124

    <GroupDescription></GroupDescription>
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  • The Cisco BGP router 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 router's IP-based control plane from denial of service (DoS) attacks....
    Rule Low Severity
    Show

  • SRG-NET-000230-RTR-000002

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco BGP router 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-000205-RTR-000016

    <GroupDescription></GroupDescription>
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  • The Cisco PE router must be configured to ignore or drop all packets with any IP options.

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

  • SRG-NET-000512-RTR-000100

    <GroupDescription></GroupDescription>
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  • The Cisco router must be configured to have Cisco Express Forwarding enabled.

    &lt;VulnDiscussion&gt;The Cisco Express Forwarding (CEF) switching mode replaces the traditional Cisco routing cache with a data structure that mir...
    Rule Medium Severity
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  • SRG-NET-000512-RTR-000012

    <GroupDescription></GroupDescription>
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  • The Cisco router must be configured to advertise a hop limit of at least 32 in Router Advertisement messages for IPv6 stateless auto-configuration deployments.

    &lt;VulnDiscussion&gt;The Neighbor Discovery protocol allows a hop limit value to be advertised by routers in a Router Advertisement message being ...
    Rule Low Severity
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  • SRG-NET-000512-RTR-000013

    <GroupDescription></GroupDescription>
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  • The Cisco router must not be configured to use IPv6 Site Local Unicast addresses.

    &lt;VulnDiscussion&gt;As currently defined, site local addresses are ambiguous and can be present in multiple sites. The address itself does not co...
    Rule Medium Severity
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  • SRG-NET-000512-RTR-000014

    <GroupDescription></GroupDescription>
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  • The Cisco perimeter router must be configured to suppress Router Advertisements on all external IPv6-enabled interfaces.

    &lt;VulnDiscussion&gt;Many of the known attacks in stateless autoconfiguration are defined in RFC 3756 were present in IPv4 ARP attacks. To mitigat...
    Rule Medium Severity
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  • SRG-NET-000364-RTR-000200

    <GroupDescription></GroupDescription>
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  • The Cisco perimeter router must be configured to drop IPv6 undetermined transport packets.

    &lt;VulnDiscussion&gt;One of the fragmentation weaknesses known in IPv6 is the undetermined transport packet. This packet contains an undetermined ...
    Rule Medium Severity
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  • SRG-NET-000364-RTR-000201

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  • SRG-NET-000364-RTR-000202

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  • The Cisco perimeter router must be configured to drop IPv6 packets containing a Hop-by-Hop header with invalid option type values.

    &lt;VulnDiscussion&gt;These options are intended to be for the Destination Options header only. The optional and extensible natures of the IPv6 ext...
    Rule Medium Severity
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  • SRG-NET-000364-RTR-000203

    <GroupDescription></GroupDescription>
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  • The Cisco perimeter router must be configured to drop IPv6 packets containing a Destination Option header with invalid option type values.

    &lt;VulnDiscussion&gt;These options are intended to be for the Hop-by-Hop header only. The optional and extensible natures of the IPv6 extension he...
    Rule Medium Severity
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  • SRG-NET-000364-RTR-000204

    <GroupDescription></GroupDescription>
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  • The Cisco perimeter router must be configured to drop IPv6 packets containing an extension header with the Endpoint Identification option.

    &lt;VulnDiscussion&gt;The optional and extensible natures of the IPv6 extension headers require higher scrutiny since many implementations do not a...
    Rule Medium Severity
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  • SRG-NET-000364-RTR-000205

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  • The Cisco perimeter router must be configured to drop IPv6 packets containing the NSAP address option within Destination Option header.

    &lt;VulnDiscussion&gt;The optional and extensible natures of the IPv6 extension headers require higher scrutiny since many implementations do not a...
    Rule Medium Severity
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  • SRG-NET-000364-RTR-000206

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  • The Cisco perimeter router must be configured to drop IPv6 packets containing a Hop-by-Hop or Destination Option extension header with an undefined option type.

    &lt;VulnDiscussion&gt;The optional and extensible natures of the IPv6 extension headers require higher scrutiny since many implementations do not a...
    Rule Medium Severity
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  • The Cisco perimeter router must be configured drop IPv6 packets with a Routing Header type 0, 1, or 3–255.

    &lt;VulnDiscussion&gt;The routing header can be used maliciously to send a packet through a path where less robust security is in place, rather tha...
    Rule Medium Severity
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