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Juniper EX Series Switches Router Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000205-RTR-000014

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  • The Juniper 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
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  • SRG-NET-000205-RTR-000015

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  • The Juniper 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 must be punted to the route engine (RE). Hackers who initiate denial-of-ser...
    Rule Medium Severity
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  • SRG-NET-000205-RTR-000016

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  • The Juniper PE router must be configured to ignore or block all packets with any IP options.

    &lt;VulnDiscussion&gt;Packets with IP options are not fast switched and, therefore, must be punted to the route engine (RE). Hackers who initiate d...
    Rule Medium Severity
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  • SRG-NET-000230-RTR-000001

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  • The Juniper router must be configured to implement message authentication for all control plane protocols.

    &lt;VulnDiscussion&gt;A rogue router could send a fictitious routing update to convince a site's perimeter router to send traffic to an incorrect o...
    Rule Medium Severity
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  • SRG-NET-000230-RTR-000002

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  • The Juniper 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
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  • SRG-NET-000230-RTR-000003

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  • The Juniper router must be configured to use keys with a duration not exceeding 180 days for authenticating routing protocol messages.

    &lt;VulnDiscussion&gt;If the keys used for routing protocol authentication are guessed, the malicious user could create havoc within the network by...
    Rule Medium Severity
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  • SRG-NET-000343-RTR-000001

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  • The router providing MPLS L2VPN services must be configured to authenticate targeted LDP sessions used to exchange VC information using a FIPS-approved message authentication code algorithm.

    &lt;VulnDiscussion&gt;Label Distribution Protocol (LDP) provides the signaling required for setting up and tearing down pseudowires (virtual circui...
    Rule Medium Severity
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  • SRG-NET-000343-RTR-000002

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  • The Juniper 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
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  • SRG-NET-000362-RTR-000109

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  • The Juniper router must not be configured to have any zero-touch deployment feature enabled when connected to an operational network.

    &lt;VulnDiscussion&gt;Network devices configured via a zero-touch deployment or auto-loading feature can have their startup configuration or image ...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000110

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  • The Juniper router must be configured to protect against or limit the effects of denial-of-service (DoS) attacks by employing control plane protection.

    &lt;VulnDiscussion&gt;The Routing Engine (RE) is critical to all network operations because it is the component used to build all forwarding paths ...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000111

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  • The Juniper router must be configured to have Gratuitous ARP disabled on all external interfaces.

    &lt;VulnDiscussion&gt;A gratuitous ARP is an ARP broadcast in which the source and destination MAC addresses are the same. It is used to inform the...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000112

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  • The Juniper router must be configured to have IP directed broadcast disabled on all interfaces.

    &lt;VulnDiscussion&gt;An IP directed broadcast is a datagram sent to the broadcast address of a subnet that is not directly attached to the sending...
    Rule Low Severity
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  • SRG-NET-000362-RTR-000113

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  • The Juniper router must be configured to have Internet Control Message Protocol (ICMP) unreachable notifications disabled on all external interfaces.

    &lt;VulnDiscussion&gt;The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000114

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  • The Juniper router must be configured to have Internet Control Message Protocol (ICMP) mask replies disabled on all external interfaces.

    &lt;VulnDiscussion&gt;The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000115

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  • The Juniper router must be configured to have Internet Control Message Protocol (ICMP) redirects disabled on all external interfaces.

    &lt;VulnDiscussion&gt;The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers automatically send ...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000117

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  • The Juniper BGP router must be configured to use the prefix limit feature to protect against route table flooding and prefix deaggregation attacks.

    &lt;VulnDiscussion&gt;The effects of prefix deaggregation can degrade router performance due to the size of routing tables and also result in black...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000118

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  • The Juniper 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 deaggregation can degrade router performance due to the size of routing tables and also result in black...
    Rule Low Severity
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  • SRG-NET-000362-RTR-000119

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  • The Juniper PE router must be configured to implement Internet Group Management Protocol (IGMP) or Multicast Listener Discovery (MLD) snooping for each Virtual Private LAN Services (VPLS) bridge domain.

    &lt;VulnDiscussion&gt;IGMP snooping provides a way to constrain multicast traffic at layer 2. By monitoring the IGMP membership reports sent by hos...
    Rule Low Severity
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  • SRG-NET-000362-RTR-000120

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  • The Juniper multicast RP router must be configured to limit the multicast forwarding cache so that its resources are not saturated by managing an overwhelming number of PIM and MSDP source-active entries.

    &lt;VulnDiscussion&gt;MSDP peering between networks enables sharing of multicast source information. Enclaves with an existing multicast topology u...
    Rule Low Severity
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  • SRG-NET-000362-RTR-000121

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  • The Juniper multicast Rendezvous Point (RP) must be configured to rate limit the number of Protocol Independent Multicast (PIM) Register messages.

    &lt;VulnDiscussion&gt;When a new source starts transmitting in a PIM Sparse Mode network, the DR will encapsulate the multicast packets into regist...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000122

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  • The Juniper multicast Designated Router (DR) must be configured to limit the number of mroute states resulting from Internet Group Management Protocol (IGMP) and Multicast Listener Discovery (MLD) Host Membership Reports.

    &lt;VulnDiscussion&gt;The current multicast paradigm can let any host join any multicast group at any time by sending an IGMP or MLD membership rep...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000123

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  • The Juniper multicast Designated Router (DR) must be configured to increase the shortest-path tree (SPT) threshold or set it to infinity to minimalize source-group (S, G) state within the multicast topology where Any Source Multicast (ASM) is deployed.

    &lt;VulnDiscussion&gt;ASM can have many sources for the same groups (many-to-many). For many receivers, the path via the RP may not be ideal compar...
    Rule Medium Severity
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  • SRG-NET-000362-RTR-000124

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

    &lt;VulnDiscussion&gt;GTSM is designed to protect a router's IP-based control plane from DoS attacks. Many attacks focused on CPU load and line-car...
    Rule Low Severity
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  • SRG-NET-000364-RTR-000109

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  • The Juniper perimeter router must be configured to block all outbound management traffic.

    &lt;VulnDiscussion&gt;For in-band management, the management network must have its own subnet to enforce control and access boundaries provided by ...
    Rule Medium Severity
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  • SRG-NET-000364-RTR-000114

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

    &lt;VulnDiscussion&gt;Unrestricted traffic may contain malicious traffic that poses a threat to an enclave or to other connected networks. Addition...
    Rule Medium Severity
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