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Juniper EX Series Switches Layer 2 Switch Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000148-L2S-000015

    <GroupDescription></GroupDescription>
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  • The Juniper EX switch must be configured to uniquely identify all network-connected endpoint devices before establishing any connection.

    &lt;VulnDiscussion&gt;Controlling LAN access via 802.1x authentication can assist in preventing a malicious user from connecting an unauthorized PC...
    Rule High Severity
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  • SRG-NET-000168-L2S-000019

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  • The Juniper layer 2 switch must be configured to disable all dynamic VLAN registration protocols.

    &lt;VulnDiscussion&gt;Dynamic VLAN registration protocols provide centralized management of VLAN domains, which can reduce administration in a swit...
    Rule Medium Severity
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  • SRG-NET-000193-L2S-000020

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  • The Juniper EX switch must be configured to manage excess bandwidth to limit the effects of packet flooding types of denial of service (DoS) attacks.

    &lt;VulnDiscussion&gt;Denial of service is a condition when a resource is not available for legitimate users. Packet flooding DDoS attacks are refe...
    Rule Medium Severity
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  • SRG-NET-000331-L2S-000001

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  • The Juniper EX switch must be configured to permit authorized users to select a user session to capture.

    &lt;VulnDiscussion&gt;Without the capability to select a user session to capture/record or view/hear, investigations into suspicious or harmful eve...
    Rule Medium Severity
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  • SRG-NET-000332-L2S-000002

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  • The Juniper EX switch must be configured to permit authorized users to remotely view, in real time, all content related to an established user session from a component separate from the layer 2 switch.

    &lt;VulnDiscussion&gt;Without the capability to remotely view/hear all content related to a user session, investigations into suspicious user activ...
    Rule Medium Severity
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  • SRG-NET-000343-L2S-000016

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  • The Juniper EX switch must be configured to authenticate all network-connected endpoint devices before establishing any connection.

    &lt;VulnDiscussion&gt;Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. ...
    Rule Medium Severity
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  • SRG-NET-000362-L2S-000021

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  • The Juniper EX switch must be configured to enable Root Protection on all interfaces connecting to access layer switches and hosts.

    &lt;VulnDiscussion&gt;Spanning Tree Protocol (STP) does not provide any means for the network administrator to securely enforce the topology of the...
    Rule Low Severity
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  • SRG-NET-000362-L2S-000022

    <GroupDescription></GroupDescription>
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  • The Juniper EX switch must be configured to enable BPDU Protection on all user-facing or untrusted access switch ports.

    &lt;VulnDiscussion&gt;If a rogue switch is introduced into the topology and transmits a Bridge Protocol Data Unit (BPDU) with a lower bridge priori...
    Rule Medium Severity
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  • SRG-NET-000362-L2S-000023

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  • The Juniper EX switch must be configured to enable STP Loop Protection on all non-designated STP switch ports.

    &lt;VulnDiscussion&gt;The Spanning Tree Protocol (STP) Loop Protection feature provides additional protection against STP loops. An STP loop is cre...
    Rule Medium Severity
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  • SRG-NET-000362-L2S-000024

    <GroupDescription></GroupDescription>
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  • The Juniper EX switch must be configured not to forward unknown unicast traffic to access interfaces.

    &lt;VulnDiscussion&gt;Access layer switches use the Content Addressable Memory (CAM) table to direct traffic to specific interfaces based on the VL...
    Rule Medium Severity
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  • SRG-NET-000362-L2S-000025

    <GroupDescription></GroupDescription>
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  • The Juniper EX switch must be configured to enable DHCP snooping for all user VLANs to validate DHCP messages from untrusted sources.

    &lt;VulnDiscussion&gt;In an enterprise network, devices under administrative control are trusted sources. These devices include the switches, route...
    Rule Medium Severity
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  • SRG-NET-000362-L2S-000026

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  • The Juniper EX switch must be configured to enable IP Source Guard on all user-facing or untrusted access VLANs.

    &lt;VulnDiscussion&gt;IP Source Guard provides source IP address filtering on an untrusted layer 2 interface to prevent a malicious host from imper...
    Rule Medium Severity
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  • SRG-NET-000362-L2S-000027

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  • The Juniper EX switch must be configured to enable Dynamic Address Resolution Protocol (ARP) Inspection (DAI) on all user VLANs.

    &lt;VulnDiscussion&gt;DAI intercepts Address Resolution Protocol (ARP) requests and verifies that each of these packets has a valid IP-to-MAC addre...
    Rule Medium Severity
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  • SRG-NET-000512-L2S-000001

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  • The Juniper EX switch must be configured to enable Storm Control on all host-facing access interfaces.

    &lt;VulnDiscussion&gt;A traffic storm occurs when packets flood a LAN, creating excessive traffic and degrading network performance. Traffic storm ...
    Rule Low Severity
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  • SRG-NET-000512-L2S-000002

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  • The Juniper EX switch must be configured to enable IGMP or MLD Snooping on all VLANs.

    &lt;VulnDiscussion&gt;IGMP and MLD snooping provides a way to constrain multicast traffic at layer 2. By monitoring the IGMP or MLD membership repo...
    Rule Low Severity
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  • SRG-NET-000512-L2S-000003

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  • If STP is used, the Juniper EX switch must be configured to implement Rapid STP, or Multiple STP, where VLANs span multiple switches with redundant links.

    &lt;VulnDiscussion&gt;Spanning Tree Protocol (STP) is implemented on bridges and switches to prevent layer 2 loops when a broadcast domain spans mu...
    Rule Medium Severity
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  • SRG-NET-000512-L2S-000004

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  • The Juniper EX switch must be configured to verify two-way connectivity on all interswitch trunked interfaces.

    &lt;VulnDiscussion&gt;In topologies where fiber optic interconnections are used, physical misconnections can occur that allow a link to appear to b...
    Rule Medium Severity
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  • SRG-NET-000512-L2S-000007

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  • The Juniper EX switch must be configured to assign all disabled access interfaces to an unused VLAN.

    &lt;VulnDiscussion&gt;It is possible that a disabled access interface that is assigned to a user or management VLAN becomes enabled by accident or ...
    Rule Medium Severity
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  • SRG-NET-000512-L2S-000008

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  • The Juniper EX switch must not be configured with VLANs used for L2 control traffic assigned to any host-facing access interface.

    &lt;VulnDiscussion&gt;In a switched Ethernet network, some protocols use L2 Protocol Data Units (PDU) to communicate in-band management or other co...
    Rule Medium Severity
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  • SRG-NET-000512-L2S-000009

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  • The Juniper EX switch must be configured to prune the default VLAN from all trunked interfaces that do not require it.

    &lt;VulnDiscussion&gt;All unassigned interfaces are placed into the default VLAN and devices connected to enabled, but unassigned interfaces can co...
    Rule Medium Severity
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  • SRG-NET-000512-L2S-000010

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  • The Juniper EX switch must not use the default VLAN for management traffic.

    &lt;VulnDiscussion&gt;By default, all unassigned interfaces are placed into the default VLAN and if used for management, could unintentionally expo...
    Rule Medium Severity
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  • SRG-NET-000512-L2S-000011

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  • The Juniper EX switch must be configured to set all user-facing or untrusted ports as access interfaces.

    &lt;VulnDiscussion&gt;Configuring user-facing or untrusted interfaces as trunked may expose network traffic to an unauthorized, or unintended, conn...
    Rule Medium Severity
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  • SRG-NET-000512-L2S-000012

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  • The Juniper EX switch must not have a native VLAN ID assigned, or have a unique native VLAN ID, for all 802.1q trunk links.

    &lt;VulnDiscussion&gt;By default, Juniper switches do not assign a native VLAN to any trunked interface. Allowing trunked interfaces to accept unta...
    Rule Medium Severity
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  • SRG-NET-000512-L2S-000013

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  • The Juniper EX switch must not have any access interfaces assigned to a VLAN configured as native for any trunked interface.

    &lt;VulnDiscussion&gt;Trunked interfaces without an assigned native VLAN do not accept untagged data packets. Allowing trunked interfaces to accept...
    Rule Low Severity
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