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The Cisco switch must have all disabled switch ports assigned to an unused VLAN.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-101149 | CISC-L2-000210 | SV-110253r1_rule | Medium |
| Description |
|---|
| A disabled port that is assigned to a user or management VLAN may become enabled by accident or by an attacker and as a result may gain access to that VLAN as a member. |
| STIG | Date |
|---|---|
| Cisco IOS Switch L2S Security Technical Implementation Guide | 2020-05-07 |
Details
| Check Text ( C-100029r1_chk ) |
|---|
| Step 1: Review the switch configurations and examine all access switch ports. Each access switch port not in use should have membership to an inactive VLAN. interface GigabitEthernet0/0 switchport access vlan 999 shutdown ! interface GigabitEthernet0/1 switchport access vlan 999 shutdown … … … interface GigabitEthernet0/9 switchport access vlan 999 shutdown Step 2: Verify that traffic from the inactive VLAN is not allowed on any trunk links as shown in the example below: interface GigabitEthernet1/1 switchport trunk allowed vlan 1-998,1000-4094 switchport trunk encapsulation dot1q switchport mode trunk Note: Switch ports configured for 802.1x are exempt from this requirement. If any access switch ports are not in use and not in an inactive VLAN, this is a finding. |
| Fix Text (F-106853r1_fix) |
|---|
| Assign all switch ports not in use to an inactive VLAN. Step 1: Assign the disabled interfaces to an inactive VLAN: SW3(config)#int range g0/0 – 9 SW3(config-if-range)# switchport access vlan 999 Step 2: Configure trunk links to not allow traffic from the inactive VLAN: SW3(config)#int g1/1 SW3(config-if)#switchport trunk allowed vlan except 999 |