Azure Introduction
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Azure Threats
Check for Zone-Redundant Virtual Machine Scale Sets
More Info:
Ensure that all your Microsoft Azure virtual machine scale sets are using zone-redundant availability configurations instead of single-zone (zonal) configurations, to deploy and load balance virtual machines (VMs) across multiple Availability Zones (AZs) in order to protect your Azure scale sets from datacenter-level failures.
Risk Level
High
Address
Security
Compliance Standards
HIPAA, NIST, HITRUST, SOC2, NISTCSF, PCIDSS
Triage and Remediation
Remediation
Sure, here are the step-by-step instructions to remediate Zone-Redundant Virtual Machine Scale Sets misconfiguration in Azure:
- Log in to the Azure portal (https://portal.azure.com).
- Navigate to the Virtual Machine Scale Sets resource that needs to be remediated.
- In the left-hand menu, select “Settings” and then select “Properties”.
- In the “Properties” pane, scroll down to the “Availability” section.
- In the “Availability” section, check if “Zone Redundancy” is set to “Enabled”. If it is enabled, then the Scale Set is configured to use Zone-Redundant Virtual Machines.
- To remediate this misconfiguration, disable the “Zone Redundancy” option by toggling the switch to “Disabled”.
- Once the “Zone Redundancy” option is disabled, click on the “Save” button at the top of the “Properties” pane to save the changes.
Congratulations! You have successfully remediated the Zone-Redundant Virtual Machine Scale Sets misconfiguration in Azure.
To remediate the Zone-Redundant Virtual Machine Scale Sets misconfiguration in Azure using Azure CLI, follow these steps:
-
Open the Azure CLI in your terminal or command prompt.
-
Login to your Azure account using the following command:
az login -
Once you are logged in, set the subscription to the one where the affected Virtual Machine Scale Set is located using the following command:
az account set --subscription <subscription_id> -
Check the current configuration of the Virtual Machine Scale Set using the following command:
az vmss show --name <vmss_name> --resource-group <resource_group_name> -
If the Virtual Machine Scale Set is configured for Zone-Redundancy, you can remediate it by disabling the Zone-Redundant deployment using the following command:
az vmss update --name <vmss_name> --resource-group <resource_group_name> --set singlePlacementGroup=false -
Once the command executes successfully, the Virtual Machine Scale Set will be updated to disable the Zone-Redundant deployment.
-
Verify the updated configuration of the Virtual Machine Scale Set using the following command:
az vmss show --name <vmss_name> --resource-group <resource_group_name> -
You have now successfully remediated the Zone-Redundant Virtual Machine Scale Sets misconfiguration in Azure using Azure CLI.
To remediate the Zone-Redundant Virtual Machine Scale Sets misconfiguration in Azure using Python, follow these steps:
- Import the necessary modules:
from azure.mgmt.compute import ComputeManagementClient
from azure.identity import DefaultAzureCredential
- Instantiate the ComputeManagementClient and DefaultAzureCredential objects:
credential = DefaultAzureCredential()
compute_client = ComputeManagementClient(credential, subscription_id)
- Use the
listmethod of thecompute_client.virtual_machine_scale_setsobject to get a list of all Virtual Machine Scale Sets in the subscription:
vmss_list = compute_client.virtual_machine_scale_sets.list()
- For each Virtual Machine Scale Set in the list, check if it is configured to use Zone-Redundant deployment by checking the
zonesproperty:
for vmss in vmss_list:
if vmss.zones is not None:
# Zone-Redundant deployment is enabled
# Remediation steps go here
- To remediate the issue, update the Virtual Machine Scale Set to use a non-Zone-Redundant deployment by setting the
zonesproperty toNone:
vmss.zones = None
compute_client.virtual_machine_scale_sets.create_or_update(resource_group_name, vmss_name, vmss)
- Repeat steps 4 and 5 for all Virtual Machine Scale Sets that have Zone-Redundant deployment enabled.
Note: Make sure to replace the subscription_id, resource_group_name, and vmss_name variables with the appropriate values for your Azure environment. Also, ensure that you have the necessary permissions to modify Virtual Machine Scale Sets in your subscription.