The system must ensure the distributed port group Promiscuous Mode policy is set to reject.

From VMware vSphere vCenter Server Version 6 Security Technical Implementation Guide

Associated with: CCI-000366

SV-78457r1_rule The system must ensure the distributed port group Promiscuous Mode policy is set to reject.

Vulnerability discussion

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.

Check content

From the vSphere Client go to Home >> Networking. Select a distributed port group and click edit and go to security and 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 | Get-VDSecurityPolicy If the "Promiscuous Mode" policy is set to accept, this is a finding.

Fix text

From the vSphere Client go to Home >> Networking. Select a distributed port group and click edit and go to security and set "Promiscuous Mode" to reject. 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 | Get-VDSecurityPolicy | Set-VDSecurityPolicy -AllowPromiscuous $false

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