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Cisco IOS Switch L2S Security Technical Implementation Guide

Rules, Groups, and Values defined within the XCCDF Benchmark

  • SRG-NET-000148-L2S-000015

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco switch must uniquely identify and authenticate 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
    Show

  • SRG-NET-000168-L2S-000019

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco switch must authenticate all VLAN Trunk Protocol (VTP) messages with a hash function using the most secured cryptographic algorithm available.

    &lt;VulnDiscussion&gt;VTP provides central management of VLAN domains, thus reducing administration in a switched network. When configuring a new V...
    Rule Medium Severity
    Show

  • SRG-NET-000193-L2S-000020

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco switch must 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 distributed DoS (DDoS...
    Rule Medium Severity
    Show

  • SRG-NET-000362-L2S-000021

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco switch must have Root Guard enabled on all switch ports connecting to access layer switches.

    &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
    Show

  • SRG-NET-000362-L2S-000022

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must have Bridge Protocol Data Unit (BPDU) Guard enabled on all user-facing or untrusted access switch ports.

    &lt;VulnDiscussion&gt;If a rogue switch is introduced into the topology and transmits a BPDU with a lower bridge priority than the existing root br...
    Rule Medium Severity
    Show

  • SRG-NET-000362-L2S-000023

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco switch must have Spanning Tree Protocol (STP) Loop Guard enabled.

    &lt;VulnDiscussion&gt;The STP loop guard feature provides additional protection against STP loops. An STP loop is created when an STP blocking port...
    Rule Medium Severity
    Show

  • SRG-NET-000362-L2S-000024

    <GroupDescription></GroupDescription>
    Group
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  • The Cisco switch must have Unknown Unicast Flood Blocking (UUFB) enabled.

    &lt;VulnDiscussion&gt;Access layer switches use the Content Addressable Memory (CAM) table to direct traffic to specific ports based on the VLAN nu...
    Rule Medium Severity
    Show

  • SRG-NET-000362-L2S-000025

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must have 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
    Show

  • SRG-NET-000362-L2S-000026

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must have IP Source Guard enabled on all user-facing or untrusted access switch ports.

    &lt;VulnDiscussion&gt;IP Source Guard provides source IP address filtering on a Layer 2 port to prevent a malicious host from impersonating a legit...
    Rule Medium Severity
    Show

  • SRG-NET-000362-L2S-000027

    <GroupDescription></GroupDescription>
    Group
    Show

  • The Cisco switch must have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs.

    &lt;VulnDiscussion&gt;DAI intercepts ARP requests and verifies that each of these packets has a valid IP-to-MAC address binding before updating the...
    Rule Medium Severity
    Show

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