Cis Azure Storage 15.1

15.1 Ensure 'Public network access' is set to 'Disabled' on Azure Elastic SAN (Automated)

Description

Azure Elastic SAN is a scalable, high-performance cloud-based storage solution. Disabling public network access at the SAN level ensures that Elastic SAN resources are accessible only through private networks.

Rationale

Disabling public network access for Azure Elastic SAN at the SAN level enhances security by preventing unauthorized external access to sensitive storage resources.

Impact

Disabling public network access at the SAN level incurs no direct cost. However, there may be costs and configuration overhead associated with setting up and managing private network access to securely connect to Azure Elastic SAN resources.

Audit Procedure

Audit from Azure Portal

1. Go to Elastic SANs.
2. Click the name of an Elastic SAN.
3. Under Settings, click Networking.
4. Ensure that Public network access is set to Disabled.
5. Repeat steps 1-4 for each Elastic SAN.

Audit from Azure CLI

Run the following command to list Elastic SANs:

az elastic-san list

For each Elastic SAN, run the following command:

az elastic-san show --resource-group <resource-group> --name <elastic-san>

Ensure that publicNetworkAccess is set to Disabled.

Audit from PowerShell

Run the following command to list Elastic SANs:

Get-AzElasticSan

Run the following command to get the Elastic SAN in a resource group with a given name:

$elasticsan = Get-AzElasticSan -ResourceGroupName <resource-group> -Name <elastic-san>

Run the following command to get the public network access setting for the Elastic SAN:

$elasticsan.PublicNetworkAccess

Ensure that the command returns Disabled.

Expected Result

For each Elastic SAN, publicNetworkAccess (CLI) or PublicNetworkAccess (PowerShell) should return Disabled. In the Azure Portal, the Public network access setting under Networking should be set to Disabled.

Remediation

Remediate from Azure Portal

1. Go to Elastic SANs.
2. Click the name of an Elastic SAN.
3. Under Settings, click Networking.
4. Under Public network access, click the radio button next to Disabled.
5. Click Apply.
6. Repeat steps 1-5 for each Elastic SAN.

Remediate from Azure CLI

For each Elastic SAN requiring remediation, run the following command to disable public network access:

az elastic-san update --resource-group <resource-group> --name <elastic-san> --public-network-access Disabled

Remediate from PowerShell

For each Elastic SAN requiring remediation, run the following command to disable public network access:

Update-AzElasticSan -ResourceGroupName <resource-group> -Name <elastic-san> -PublicNetworkAccess Disabled

Default Value

Public network access at the SAN level is enabled by default, but access to individual volume groups is denied unless explicitly configured.

References

1. https://learn.microsoft.com/en-us/azure/storage/elastic-san/elastic-san-networking
2. https://learn.microsoft.com/en-us/cli/azure/elastic-san
3. https://learn.microsoft.com/en-us/powershell/module/az.elasticsan/get-azelasticsan
4. https://learn.microsoft.com/en-us/powershell/module/az.elasticsan/update-azelasticsan

CIS Controls

Profile

Level 2 | Automated