Check: VCTR-67-000020
VMware vSphere 6.7 vCenter STIG:
VCTR-67-000020
(in versions v1 r4 through v1 r2)
Title
The vCenter Server must not configure all port groups to VLAN values reserved by upstream physical switches. (Cat II impact)
Discussion
Certain physical switches reserve certain VLAN IDs for internal purposes and often disallow traffic configured to these values. For example, Cisco Catalyst switches typically reserve VLANs 1001–1024 and 4094, while Nexus switches typically reserve 3968–4047 and 4094. Check with the documentation for the specific switch. Using a reserved VLAN might result in a denial of service on the network.
Check Content
If distributed switches are not used, this is not applicable. From the vSphere Client, go to Networking >> select a distributed switch >> select a distributed port group >> Configure >> Settings >> Policies. Review the port group VLAN tags and verify they are not set to a reserved VLAN ID. or From a PowerCLI command prompt while connected to the vCenter server, run the following command: Get-VDPortgroup | select Name, VlanConfiguration If any port group is configured with a reserved VLAN ID, this is a finding.
Fix Text
From the vSphere Client, go to Networking >> select a distributed switch >> select a distributed port group >> Configure >> Settings >> Policies. Click "Edit". Under the VLAN section, change the VLAN ID to an unreserved VLAN ID and click "OK". or From a PowerCLI command prompt while connected to the vCenter server, run the following command: Get-VDPortgroup "portgroup name" | Set-VDVlanConfiguration -VlanId "New VLAN#"
Additional Identifiers
Rule ID: SV-243088r879887_rule
Vulnerability ID: V-243088
Group Title: SRG-APP-000516
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000366 |
The organization implements the security configuration settings. |
Controls
Number | Title |
---|---|
CM-6 |
Configuration Settings |