Free DISA STIG and SRG Library | Vaulted

V-62203

The layer 2 switch must not have the default VLAN assigned to any host-facing switch ports.

Finding ID
SRG-NET-000512-L2S-000008
Rule ID
SV-76693r1_rule
Severity
Cat II
CCE
(None)
Group Title
SRG-NET-000512
CCI
CCI-000366
Target Key
(None)
Documentable
No
Discussion

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. As a consequence, the default VLAN may unwisely span the entire network if not appropriately pruned. If its scope is large enough, the risk of compromise can increase significantly.

Fix Text

Remove the assignment of the default VLAN from all access switch ports.

Check Content

Review the switch configurations and verify that no access switch ports have been assigned membership to the default VLAN (i.e., VLAN 1). A good method of ensuring there is not membership to the default VLAN is to have it disabled (i.e., shutdown) on the switch. This technique does not prevent switch control plane protocols such as CDP, DTP, VTP, and PAgP from using the default VLAN. If there are access switch ports assigned to the default VLAN, this is a finding.