The layer 2 switch must not have any switch ports assigned to the native VLAN.
Overview
Finding ID
Version
Rule ID
IA Controls
Severity
V-206672
SRG-NET-000512-L2S-000013
SV-206672r385561_rule
Low
Description
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 frame tagging, the malicious user can begin the attack by sending frames with two sets of tags. The outer tag that will have the attacker’s VLAN ID (probably the well-known and omnipresent default VLAN) is stripped off by the switch, and the inner tag that will have the victim’s VLAN ID is used by the switch as the next hop and sent out the trunk port.