Detections
Analytics

1.16 CISC-L2-000210

Information

The Cisco switch must have all disabled switch ports assigned to an unused VLAN.

GROUP ID: V-220690
RULE ID: SV-220690r991946

It is possible that a disabled port that is assigned to a user or management VLAN becomes enabled by accident or by an attacker and as a result gains access to that VLAN as a member.

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

Assign all switch ports not in use to an inactive VLAN.

Step 1: Assign the disabled interfaces to an inactive VLAN.

SW1(config)# int e1/81-128
SW1(config-if-range)# switchport access vlan 999
SW1(config-if-range)# end

Step 2: Configure trunk links to not allow traffic from the inactive VLAN.

SW1(config-if)# switchport trunk allowed vlan except 999
SW1(config-if)# end

See Also

https://workbench.cisecurity.org/benchmarks/23772

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-7, CAT|II, CCI|CCI-004891, Rule-ID|SV-220690r991946_rule, STIG-ID|CISC-L2-000210, Vuln-ID|V-220690

Plugin: Cisco

Control ID: 1ba1080ab566178dc513b87b6ab8ee1bd49cee0ecc0dce47fbabf1f570522945