Title

The RUCKUS ICX switch must not have the default VLAN assigned to any host-facing switch ports. (Cat II impact)

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. Therefore, 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.

Check Content

Review the switch configurations and verify that no access switch ports have been assigned membership to the default VLAN. Router#show vlans PORT-VLAN 5, Name DEFAULT-VLAN], Priority level0, in single spanning tree domain Untagged Ports: None Tagged Ports: (U1/M1) 1 2 5 7 9 11 Mac-Vlan Ports: None Monitoring: Disabled If there are access switch ports assigned to the default VLAN, this is a finding.

Fix Text

Remove the assignment of the default VLAN from all access switch ports. 1. Remove the default VLAN. Router(config-vlan-5)#tag ethernet 1/1/48 Added tagged port(s) ethernet 1/1/48 to port-vlan 5. Router(config-vlan-5)# 2. Save the configuration. Router(config-vlan-5)# write memory Note: The Default VLAN ID can be configurable by the administrator.

Additional Identifiers

Rule ID: SV-273689r1111059_rule

Vulnerability ID: V-273689

Group Title: SRG-NET-000512-L2S-000008

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.