Cisco IOS Switch L2S Security Technical Implementation Guide
Rules, Groups, and Values defined within the XCCDF Benchmark
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SRG-NET-000512-L2S-000011
Group -
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
Group -
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
Group -
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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