The HP FlexFabric Switch must not have the default VLAN assigned to any host-facing switch ports.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-66087	HFFS-L2-000025	SV-80577r1_rule		Medium

Description
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.

Description

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.

STIG	Date
HP FlexFabric Switch L2S Security Technical Implementation Guide	2020-06-03

Details

Check Text ( C-66731r1_chk )
Review the HP FlexFabric 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. If there are access switch ports assigned to the default VLAN, this is a finding. display vlan 1 VLAN ID: 1 VLAN type: Static Route interface: Configured: Description: VLAN 0001 Name: VLAN 0001 Tagged ports: None Untagged ports: GigabitEthernet1/0/1 GigabitEthernet1/0/2 GigabitEthernet1/0/3 GigabitEthernet1/0/4 [HP-GigabitEthernet1/0/12]shutdown

Check Text ( C-66731r1_chk )

Review the HP FlexFabric 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.

If there are access switch ports assigned to the default VLAN, this is a finding.

display vlan 1
VLAN ID: 1
VLAN type: Static
Route interface: Configured:
Description: VLAN 0001
Name: VLAN 0001
Tagged ports: None
Untagged ports:
GigabitEthernet1/0/1 GigabitEthernet1/0/2
GigabitEthernet1/0/3 GigabitEthernet1/0/4

[HP-GigabitEthernet1/0/12]shutdown

Fix Text (F-72163r1_fix)
Remove the assignment of the default VLAN from all access switch ports. display vlan 1 [HP-vlan2]port GigabitEthernet 1/0/1 to GigabitEthernet 1/0/48 [HP-GigabitEthernet1/0/1]shutdown