Cisco IOS Switch L2S Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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The Cisco 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...Rule Medium Severity -
SRG-NET-000512-L2S-000005
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The Cisco 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 negoti...Rule Medium Severity -
SRG-NET-000512-L2S-000007
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The Cisco switch must have all disabled switch ports assigned to an unused VLAN.
A disabled port that is assigned to a user or management VLAN may become enabled by accident or by an attacker and as a result may gain access to that VLAN as a member.Rule Medium Severity -
SRG-NET-000512-L2S-000008
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The Cisco 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 Pr...Rule Medium Severity -
SRG-NET-000512-L2S-000009
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SRG-NET-000512-L2S-000010
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The Cisco 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 Tru...Rule Medium Severity -
SRG-NET-000512-L2S-000011
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The Cisco 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...Rule Medium Severity -
SRG-NET-000512-L2S-000012
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The Cisco 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 connecte...Rule Medium Severity -
SRG-NET-000512-L2S-000013
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The Cisco switch must not have any switchports 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...Rule Low Severity -
The Cisco switch must uniquely identify and authenticate 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 det...Rule High Severity -
The Cisco switch must authenticate all VLAN Trunk Protocol (VTP) messages with a hash function using the most secured cryptographic algorithm available.
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...Rule Medium Severity -
The Cisco switch must have Root Guard enabled on all switch ports connecting to access layer switches.
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. Howev...Rule Low Severity -
The Cisco switch must have Bridge Protocol Data Unit (BPDU) Guard enabled on all user-facing or untrusted access switch ports.
If a rogue switch is introduced into the topology and transmits a BPDU with a lower bridge priority than the existing root bridge, it will become the new root bridge and cause a topology change, re...Rule Medium Severity
Node 2
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