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V-269966

CAT II (Medium)

The Dell OS10 Switch must have all disabled switch ports assigned to an unused VLAN.

Rule ID

SV-269966r1052284_rule

STIG

Dell OS10 Switch Layer 2 Switch Security Technical Implementation Guide

Version

V1R1

CCIs

CCI-000366

Discussion

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.

Check Content

Review the switch configurations and examine all access switch ports. Each access switch port not in use should have membership to an inactive VLAN that is not used for any purpose and is not allowed on any trunk links.

Verify that there is a shutdown VLAN configured for unused ports:

!
interface vlan999
 description "Unused VLAN"
 shutdown
 
Verify that the unused switch ports are assigned to the inactive VLAN:
 
!
interface ethernet1/1/57
 shutdown
 switchport access vlan 999
 flowcontrol receive off
!
interface ethernet1/1/58
 shutdown
 switchport access vlan 999
 flowcontrol receive off

Verify that no trunk links are configured to accept the unused VLAN ID:

!
interface ethernet1/1/1
 no shutdown
 switchport mode trunk
 switchport access vlan 100
 flowcontrol receive off
 
If there are any access switch ports not in use and not in an inactive VLAN, this is a finding.

Fix Text

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

Assign a VLAN interface to be unused:

OS10(config)# interface vlan 999
OS10(conf-if-vl-999)# description "Unused VLAN"
OS10(conf-if-vl-999)# shutdown
OS10(conf-if-vl-999)# exit

Assign unused switch ports to the unused VLAN:

OS10(config)# interface range eth1/1/50-1/1/58
OS10(conf-range-eth1/1/50-1/1/58)# switchport access vlan 999