Layer 2 Switch Security Requirements Guide

This Security Requirements Guide is published as a tool to improve the security of Department of Defense (DoD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via e-mail to the following address: [email protected]

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Version / Release: V1R5

Published: 2019-12-12

Updated At: 2020-01-27 23:27:05

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Drop CKL or SCAP (XCCDF) results here.

    Vuln Rule Version CCI Severity Title Description Status Finding Details Comments
    SV-76555r1_rule SRG-NET-000131-L2S-000014 CCI-000381 MEDIUM The layer 2 switch must be configured to disable non-essential capabilities. A compromised switch introduces risk to the entire network infrastructure as well as data resources that are accessible via the network. The perimeter defense has no oversight or control of attacks by malicious users within the network. Preventing network
    SV-95193r1_rule SRG-NET-000148-L2S-000015 CCI-000778 HIGH The layer 2 switch must uniquely identify all network-connected endpoint devices before establishing any connection. Controlling LAN access via 802.1x authentication can assist in preventing a malicious user from connecting an unauthorized PC to a switch port to inject or receive data from the network without detection.
    SV-76651r1_rule SRG-NET-000168-L2S-000019 CCI-000803 MEDIUM The layer 2 switch must authenticate all VLAN Trunk Protocol (VTP) messages with a hash function using the most secured cryptographic algorithm available. VLAN Trunk Protocol (VTP) provides central management of VLAN domains, thus reducing administration in a switched network. When configuring a new VLAN on a VTP server, the VLAN is distributed through all switches in the domain. This reduces the need to co
    SV-76653r1_rule SRG-NET-000193-L2S-000020 CCI-001095 MEDIUM The layer 2 switch must manage excess bandwidth to limit the effects of packet flooding types of denial of service (DoS) attacks. Denial of service is a condition when a resource is not available for legitimate users. Packet flooding DDoS attacks are referred to as volumetric attacks and have the objective of overloading a network or circuit to deny or seriously degrade performance,
    SV-76655r2_rule SRG-NET-000235-L2S-000031 CCI-001126 MEDIUM The layer 2 switch must be configured to fail securely in the event of an operational failure. If the switch fails in an unsecure manner (open), unauthorized traffic originating externally to the enclave may enter or the device may permit unauthorized information release. Fail secure is a condition achieved by employing information system mechanism
    SV-76657r1_rule SRG-NET-000331-L2S-000001 CCI-001919 MEDIUM The layer 2 switch must provide the capability for authorized users to select a user session to capture. Without the capability to select a user session to capture/record or view/hear, investigations into suspicious or harmful events would be hampered by the volume of information captured. The volume of information captured may also adversely impact the oper
    SV-76659r1_rule SRG-NET-000332-L2S-000002 CCI-001920 MEDIUM The layer 2 switch must provide the capability for 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. Without the capability to remotely view/hear all content related to a user session, investigations into suspicious user activity would be hampered. Real-time monitoring allows authorized personnel to take action before additional damage is done. The abili
    SV-76661r1_rule SRG-NET-000343-L2S-000016 CCI-001958 MEDIUM The layer 2 switch must authenticate all network-connected endpoint devices before establishing any connection. Without authenticating devices, unidentified or unknown devices may be introduced, thereby facilitating malicious activity. For distributed architectures (e.g., service-oriented architectures), the decisions regarding the validation of authentication cla
    SV-76663r2_rule SRG-NET-000362-L2S-000021 CCI-002385 LOW The layer 2 switch must have Root Guard enabled on all switch ports connecting to access layer switches and hosts. Spanning Tree Protocol (STP) does not provide any means for the network administrator to securely enforce the topology of the switched network. Any switch can be the root bridge in a network. However, a more optimal forwarding topology places the root bri
    SV-76665r1_rule SRG-NET-000362-L2S-000022 CCI-002385 MEDIUM The layer 2 switch must have BPDU Guard enabled on all user-facing or untrusted access switch ports. If a rogue switch is introduced into the topology and transmits a Bridge Protocol Data Unit (BPDU) with a lower bridge priority than the existing root bridge, it will become the new root bridge and cause a topology change, rendering the network in a subop
    SV-76667r1_rule SRG-NET-000362-L2S-000023 CCI-002385 MEDIUM The layer 2 switch must have STP Loop Guard enabled on all non-designated STP switch ports. The Spanning Tree Protocol (STP) loop guard feature provides additional protection against STP loops. An STP loop is created when an STP blocking port in a redundant topology erroneously transitions to the forwarding state. In its operation, STP relies on
    SV-76669r1_rule SRG-NET-000362-L2S-000024 CCI-002385 MEDIUM The layer 2 switch must have Unknown Unicast Flood Blocking (UUFB) enabled. Access layer switches use the Content Addressable Memory (CAM) table to direct traffic to specific ports based on the VLAN number and the destination MAC address of the frame. When a router has an Address Resolution Protocol (ARP) entry for a destination
    SV-76671r2_rule SRG-NET-000362-L2S-000025 CCI-002385 MEDIUM The layer 2 switch must have DHCP snooping for all user VLANs to validate DHCP messages from untrusted sources. In an enterprise network, devices under administrative control are trusted sources. These devices include the switches, routers, and servers in the network. Host ports and unknown DHCP servers are considered untrusted sources. An unknown DHCP server on th
    SV-76673r1_rule SRG-NET-000362-L2S-000026 CCI-002385 MEDIUM The layer 2 switch must have IP Source Guard enabled on all user-facing or untrusted access switch ports. IP Source Guard provides source IP address filtering on a Layer 2 port to prevent a malicious host from impersonating a legitimate host by assuming the legitimate host's IP address. The feature uses dynamic DHCP snooping and static IP source binding to ma
    SV-76675r1_rule SRG-NET-000362-L2S-000027 CCI-002385 MEDIUM The layer 2 switch must have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs. DAI intercepts Address Resolution Protocol (ARP) requests and verifies that each of these packets has a valid IP-to-MAC address binding before updating the local ARP cache and before forwarding the packet to the appropriate destination. Invalid ARP packet
    SV-76683r1_rule SRG-NET-000512-L2S-000003 CCI-000366 MEDIUM The layer 2 switch must implement Rapid STP where VLANs span multiple switches with redundant links. Spanning Tree Protocol (STP) is implemented on bridges and switches to prevent layer 2 loops when a broadcast domain spans multiple bridges and switches and when redundant links are provisioned to provide high availability in case of link failures. Conver
    SV-76685r1_rule SRG-NET-000512-L2S-000004 CCI-000366 MEDIUM The layer 2 switch must enable Unidirectional Link Detection (UDLD) to protect against one-way connections. In topologies where fiber optic interconnections are used, physical misconnections can occur that allow a link to appear to be up when there is a mismatched set of transmit/receive pairs. When such a physical misconfiguration occurs, protocols such as STP
    SV-76687r1_rule SRG-NET-000512-L2S-000005 CCI-000366 MEDIUM The layer 2 switch must have all trunk links enabled statically. When trunk negotiation is enabled via Dynamic Trunk Protocol (DTP), considerable time can be spent negotiating trunk settings (802.1q or ISL) when a node or interface is restored. While this negotiation is happening, traffic is dropped because the link is
    SV-76691r1_rule SRG-NET-000512-L2S-000007 CCI-000366 MEDIUM The layer 2 switch must have all disabled switch ports assigned to an unused VLAN. It is possible that a disabled port that is assigned to a user or management VLAN becomes enabled by accident or by an attacker and as a result gains access to that VLAN as a member.
    SV-76693r1_rule SRG-NET-000512-L2S-000008 CCI-000366 MEDIUM The layer 2 switch must not have the default VLAN assigned to any host-facing switch ports. In a VLAN-based network, switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with other networking devices using Spanning-Tree Protocol (STP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggre
    SV-76695r1_rule SRG-NET-000512-L2S-000009 CCI-000366 MEDIUM The layer 2 switch must have the default VLAN pruned from all trunk ports that do not require it. The default VLAN (i.e., VLAN 1) is a special VLAN used for control plane traffic such as Spanning-Tree Protocol (STP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggregation Protocol (PAgP). VLAN 1 is enabled on all trunks and
    SV-76697r1_rule SRG-NET-000512-L2S-000010 CCI-000366 MEDIUM The layer 2 switch must not use the default VLAN for management traffic. Switches use the default VLAN (i.e., VLAN 1) for in-band management and to communicate with directly connected switches using Spanning-Tree Protocol (STP), Dynamic Trunking Protocol (DTP), VLAN Trunking Protocol (VTP), and Port Aggregation Protocol (PAgP)
    SV-76699r1_rule SRG-NET-000512-L2S-000011 CCI-000366 MEDIUM The layer 2 switch must have all user-facing or untrusted ports configured as access switch ports. Double encapsulation can be initiated by an attacker who has access to a switch port belonging to the native VLAN of the trunk port. Knowing the victim's MAC address and with the victim attached to a different switch belonging to the same trunk group, the
    SV-76701r1_rule SRG-NET-000512-L2S-000012 CCI-000366 MEDIUM The layer 2 switch must have the native VLAN assigned to an ID other than the default VLAN for all 802.1q trunk links. VLAN hopping can be initiated by an attacker who has access to a switch port belonging to the same VLAN as the native VLAN of the trunk link connecting to another switch that the victim is connected to. If the attacker knows the victim’s MAC address, it
    SV-76703r2_rule SRG-NET-000512-L2S-000013 CCI-000366 LOW The layer 2 switch must not have any switch ports assigned to the native VLAN. Double encapsulation can be initiated by an attacker who has access to a switch port belonging to the native VLAN of the trunk port. Knowing the victim’s MAC address and with the victim attached to a different switch belonging to the same trunk group, t
    SV-105017r1_rule SRG-NET-000512-L2S-000001 CCI-000366 LOW The layer 2 switch must have Storm Control configured on all host-facing switch ports. A traffic storm occurs when packets flood a LAN, creating excessive traffic and degrading network performance. Traffic storm control prevents network disruption by suppressing ingress traffic when the number of packets reaches a configured threshold level
    SV-105019r1_rule SRG-NET-000512-L2S-000002 CCI-000366 LOW The layer 2 switch must have IGMP or MLD Snooping configured on all VLANs IGMP and MLD snooping provides a way to constrain multicast traffic at Layer 2. By monitoring the IGMP or MLD membership reports sent by hosts within a VLAN, the snooping application can set up Layer 2 multicast forwarding tables to deliver specific multi