The vCenter Server for Windows must manage excess capacity, bandwidth, or other redundancy to limit the effects of information-flooding types of Denial of Service (DoS) attacks by enabling Network I/O Control (NIOC).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-94727	VCWN-65-000007	SV-104557r1_rule		Medium

Description
DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity. Managing excess capacity ensures that sufficient capacity is available to counter flooding attacks. Employing increased capacity and service redundancy may reduce the susceptibility to some DoS attacks. Managing excess capacity may include, for example, establishing selected usage priorities, quotas, or partitioning.

Description

DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity. Managing excess capacity ensures that sufficient capacity is available to counter flooding attacks. Employing increased capacity and service redundancy may reduce the susceptibility to some DoS attacks. Managing excess capacity may include, for example, establishing selected usage priorities, quotas, or partitioning.

STIG	Date
VMware vSphere 6.5 vCenter Server for Windows Security Technical Implementation Guide	2019-05-22

Details

Check Text ( C-93917r1_chk )
From the vSphere Web Client go to Networking >> Select a distributed switch >> Configure >> Settings >> Properties. View the Properties pane and verify Network I/O Control is enabled. or From a PowerCLI command prompt while connected to the vCenter server run the following command: Get-VDSwitch \| select Name,@{N="NIOC Enabled";E={$_.ExtensionData.config.NetworkResourceManagementEnabled}} If Network I/O Control is disabled, this is a finding.

Check Text ( C-93917r1_chk )

From the vSphere Web Client go to Networking >> Select a distributed switch >> Configure >> Settings >> Properties. View the Properties pane and verify Network I/O Control is enabled.

or

From a PowerCLI command prompt while connected to the vCenter server run the following command:

Get-VDSwitch | select Name,@{N="NIOC Enabled";E={$_.ExtensionData.config.NetworkResourceManagementEnabled}}

If Network I/O Control is disabled, this is a finding.

Fix Text (F-100845r1_fix)
From the vSphere Web Client go to Networking >> Select a distributed switch >> Configure >> Settings >> Properties. In the Properties pane click "Edit" and change Network I/O Control to enabled. or From a PowerCLI command prompt while connected to the vCenter server run the following command: (Get-VDSwitch "DVSwitch Name" \| Get-View).EnableNetworkResourceManagement($true)