| V-253948 | High | The Juniper EX 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... |
| V-253949 | High | The Juniper EX switch must be configured to 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 an access interface to inject or receive data from the network... |
| V-253954 | Medium | The Juniper EX switch must be configured to 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),... |
| V-253960 | Medium | The Juniper EX switch must be configured to enable IP Source Guard on all user-facing or untrusted access VLANs. | IP Source Guard provides source IP address filtering on an untrusted layer 2 interface to prevent a malicious host from impersonating a legitimate host by assuming the legitimate host's IP... |
| V-253961 | Medium | The Juniper EX switch must be configured to enable Dynamic Address Resolution Protocol (ARP) Inspection (DAI) 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... |
| V-253964 | Medium | 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. | 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... |
| V-253965 | Medium | The Juniper EX switch must be configured to verify two-way connectivity on all interswitch trunked interfaces. | 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... |
| V-253968 | Medium | The Juniper EX switch must be configured to prune the default VLAN from all trunked interfaces that do not require it. | All unassigned interfaces are placed into the default VLAN and devices connected to enabled, but unassigned interfaces can communicate within that VLAN. Although the default VLAN is not... |
| V-253969 | Medium | The Juniper EX switch must not use the default VLAN for management traffic. | By default, all unassigned interfaces are placed into the default VLAN and if used for management, could unintentionally expose sensitive traffic or protected resources to unauthorized devices. |
| V-253966 | Medium | The Juniper EX switch must be configured to assign all disabled access interfaces to an unused VLAN. | It is possible that a disabled access interface 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. |
| V-253967 | Medium | The Juniper EX switch must not be configured with VLANs used for L2 control traffic assigned to any host-facing access interface. | In a switched Ethernet network, some protocols use L2 Protocol Data Units (PDU) to communicate in-band management or other control information. This control traffic is inappropriate for... |
| V-253971 | Medium | 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. | By default, Juniper switches do not assign a native VLAN to any trunked interface. Allowing trunked interfaces to accept untagged data packets may unintentionally expose VLANs to unauthorized... |
| V-253970 | Medium | The Juniper EX switch must be configured to set all user-facing or untrusted ports as access interfaces. | Configuring user-facing or untrusted interfaces as trunked may expose network traffic to an unauthorized, or unintended, connected endpoint. Access interfaces can belong to a single VLAN rather... |
| V-253959 | Medium | The Juniper EX switch must be configured to enable 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 interfaces and unknown DHCP... |
| V-253958 | Medium | The Juniper EX switch must be configured not to forward unknown unicast traffic to access interfaces. | Access layer switches use the Content Addressable Memory (CAM) table to direct traffic to specific interfaces based on the VLAN number and the destination MAC address of the frame. When a router... |
| V-253957 | Medium | The Juniper EX switch must be configured to enable STP Loop Protection on all non-designated STP switch ports. | The Spanning Tree Protocol (STP) Loop Protection feature provides additional protection against STP loops. An STP loop is created when an STP blocking port in a redundant topology erroneously... |
| V-253956 | Medium | The Juniper EX switch must be configured to enable BPDU Protection 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... |
| V-253953 | Medium | 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. | 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... |
| V-253952 | Medium | The Juniper EX switch must be configured to permit 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... |
| V-253951 | Medium | 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. | 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... |
| V-253950 | Medium | The Juniper layer 2 switch must be configured to disable all dynamic VLAN registration protocols. | Dynamic VLAN registration protocols provide centralized management of VLAN domains, which can reduce administration in a switched network. Interfaces are assigned to VLANs and the VLAN is... |
| V-253962 | Low | The Juniper EX switch must be configured to enable Storm Control on all host-facing access interfaces. | 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... |
| V-253963 | Low | The Juniper EX switch must be configured to enable IGMP or MLD Snooping 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... |
| V-253955 | Low | The Juniper EX switch must be configured to enable Root Protection on all interfaces 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.... |
| V-253972 | Low | The Juniper EX switch must not have any access interfaces assigned to a VLAN configured as native for any trunked interface. | Trunked interfaces without an assigned native VLAN do not accept untagged data packets. Allowing trunked interfaces to accept untagged data packets may unintentionally expose VLANs to unauthorized... |
