The vCenter Server for Windows must set the distributed port group Promiscuous Mode policy to reject.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-94741 | VCWN-65-000015 | SV-104571r1_rule | Medium |
| Description |
|---|
| When promiscuous mode is enabled for a virtual switch all virtual machines connected to the Portgroup have the potential of reading all packets across that network, meaning only the virtual machines connected to that Portgroup. Promiscuous mode is disabled by default on the ESXi Server, and this is the recommended setting. |
| STIG | Date |
|---|---|
| VMware vSphere 6.5 vCenter Server for Windows Security Technical Implementation Guide | 2020-03-27 |
Details
| Check Text ( C-93931r1_chk ) |
|---|
| From the vSphere Web Client go to Networking >> Select a distributed switch >> Select a port group >> Configure >> Settings >> Policies Verify "Promiscuous Mode" is set to reject. or From a PowerCLI command prompt while connected to the vCenter server run the following commands: Get-VDSwitch | Get-VDSecurityPolicy Get-VDPortgroup | ?{$_.IsUplink -eq $false} | Get-VDSecurityPolicy If the "Promiscuous Mode" policy is set to accept, this is a finding. |
| Fix Text (F-100859r1_fix) |
|---|
| From the vSphere Web Client go to Networking >> Select a distributed switch >> Select a port group >> Configure >> Settings >> Policies >> Edit >> Security. Set "Promiscuous Mode" to reject. Click "OK". Â or From a PowerCLI command prompt while connected to the vCenter server run the following commands: Get-VDSwitch | Get-VDSecurityPolicy | Set-VDSecurityPolicy -AllowPromiscuous $false Get-VDPortgroup | ?{$_.IsUplink -eq $false} | Get-VDSecurityPolicy | Set-VDSecurityPolicy -AllowPromiscuous $false |