| Finding ID |
Severity |
Title |
Description |
|
V-269953
|
High |
The Dell OS10 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.
Satisfies: SRG-NET-000148-L2S-000015, SRG-NET-000343-L2S-000016 |
|
V-269972
|
Medium |
The Dell OS10 Switch must implement physically or logically separate subnetworks to isolate organization-defined critical system components and functions. |
Separating critical system components and functions from other noncritical system components and functions through separate subnetworks may be necessary to reduce susceptibility to a catastrophic or debilitating breach or compromise that results in system failure. For example, physically separating the command-and-control function from the in-flight entertainment function through separate subnetworks... |
|
V-269970
|
Medium |
The Dell OS10 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, thereby requiring the trunk link and... |
|
V-269969
|
Medium |
The Dell OS10 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)—all untagged traffic. Therefore, the default VLAN may unwisely span the entire network if not appropriately... |
|
V-269968
|
Medium |
The Dell OS10 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 ports by default. With larger campus networks, use caution... |
|
V-269967
|
Medium |
The Dell OS10 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 Aggregation Protocol (PAgP)—all untagged traffic. Therefore, the default VLAN may unwisely span the entire... |
|
V-269966
|
Medium |
The Dell OS10 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. |
|
V-269965
|
Medium |
The Dell OS10 Switch must enable Far-End Failure Detection (FEFD) 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 can cause network instability. UDLD is a Layer 2 protocol that... |
|
V-269964
|
Medium |
The Dell OS10 Switch must implement Rapid Spanning Tree Protocol (STP) where VLANs span multiple switches with redundant links. |
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. Convergence time can be significantly reduced using Rapid STP (802.1w) instead of STP (802.1d),... |
|
V-269961
|
Medium |
The Dell OS10 Switch must have Dynamic Address Resolution Protocol (ARP) Inspection (DAI) enabled on all user VLANs. |
DAI intercepts 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 packets are dropped and logged. DAI determines the validity of an ARP packet based on valid... |
|
V-269960
|
Medium |
The Dell OS10 Switch must have Source Address Validation (SAV) 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 match IP addresses to hosts on untrusted Layer... |
|
V-269959
|
Medium |
The Dell OS10 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 the network on an untrusted port is called a spurious DHCP server, any... |
|
V-269958
|
Medium |
The Dell OS10 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 host and forwards it to the access layer... |
|
V-269957
|
Medium |
The Dell OS10 Switch must have STP Loop Guard enabled on all nondesignated 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 continuous reception and transmission of Bridge Protocol Data Unit (BPDUs)... |
|
V-269956
|
Medium |
The Dell OS10 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 suboptimal state. The STP PortFast BPDU... |
|
V-269954
|
Medium |
The Dell OS10 Switch must manage excess bandwidth to limit the effects of packet flooding types of denial-of-service (DoS) attacks. |
DoS is a condition when a resource is not available for legitimate users. Packet flooding distributed denial-of-service (DDoS) attacks are referred to as volumetric attacks and have the objective of overloading a network or circuit to deny or seriously degrade performance, which denies access to the services that normally traverse... |
|
V-269971
|
Low |
The Dell OS10 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, thereby requiring the trunk link and... |
|
V-269963
|
Low |
The Dell OS10 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 multicast traffic only to interfaces connected to hosts... |
|
V-269962
|
Low |
The Dell OS10 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. Traffic storm control monitors ingress traffic levels on a port and drops traffic when... |
|
V-269955
|
Low |
The Dell OS10 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 bridge at a specific predetermined location. With the standard... |
