Cis Azure Storage 5.2.5

5.2.5 Ensure public network access on Recovery Services vaults is Disabled (Automated)

Description

Disable public network access on Recovery Services vaults to prevent exposure to the internet and reduce the risk of unauthorized access. Use private endpoints and Azure Role-Based Access Control (RBAC) to securely manage access within trusted networks.

Rationale

Disabling public network access improves security by ensuring that a Recovery Services vault is not exposed on the public internet.

Impact

Disabling public network access on Recovery Services vaults restricts access to the vault. This enhances security but may require the configuration of private endpoints for any services or users needing access within trusted networks.

Audit Procedure

Audit from Azure Portal

1. Go to Recovery Services vaults.
2. Click the name of a vault.
3. Under Settings, click Networking.
4. Under Public access, ensure that Public network access is set to Deny.
5. Repeat steps 1-4 for each Recovery Services vault.

Audit from Azure CLI

Run the following command to list Recovery Services vaults:

az backup vault list

For each Recovery Services vault, run the following command:

az backup vault show --resource-group <resource-group> --name <recovery-services-vault>

Ensure that under properties, publicNetworkAccess is set to Disabled.

Audit from PowerShell

Run the following command to list Recovery Services vaults:

Get-AzRecoveryServicesVault

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

$vault = Get-AzRecoveryServicesVault -ResourceGroupName <resource-group> -Name <recovery-services-vault>

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

$vault.Properties.PublicNetworkAccess

Ensure that the command returns Disabled. Repeat for each Recovery Services vault.

Expected Result

• properties.publicNetworkAccess is set to Disabled
• In Azure Portal, Public network access is set to Deny
• PowerShell returns Disabled for $vault.Properties.PublicNetworkAccess

Remediation

Remediate from Azure Portal

1. Go to Recovery Services vaults.
2. Click the name of a vault.
3. Under Settings, click Networking.
4. Under Public access, click the radio button next to Deny.
5. Click Apply.
6. Repeat steps 1-5 for each Recovery Services vault requiring remediation.

Remediate from Azure CLI

For each Recovery Services vault requiring remediation, run the following command to disable public network access:

az backup vault update --resource-group <resource-group> --name <recovery-services-vault> --public-network-access Disable

Remediate from PowerShell

For each Recovery Services vault requiring remediation, run the following command to disable public network access:

Update-AzRecoveryServicesVault -ResourceGroupName <resource-group> -Name <recovery-services-vault> -PublicNetworkAccess "Disabled"

Default Value

Public network access is enabled by default on Recovery Services vaults.

References

1. https://learn.microsoft.com/en-us/azure/backup/private-endpoints#deny-public-network-access-to-the-vault
2. https://learn.microsoft.com/en-us/cli/azure/backup/vault?view=azure-cli-latest#az-backup-vault-list
3. https://learn.microsoft.com/en-us/cli/azure/backup/vault?view=azure-cli-latest#az-backup-vault-show
4. https://learn.microsoft.com/en-us/cli/azure/backup/vault?view=azure-cli-latest#az-backup-vault-update
5. https://learn.microsoft.com/en-us/powershell/module/az.recoveryservices/get-azrecoveryservicesvault?view=azps-12.4.0
6. https://learn.microsoft.com/en-us/powershell/module/az.recoveryservices/update-azrecoveryservicesvault?view=azps-12.4.0

Additional Information

Private endpoints for Backup can be only created for Recovery Services vaults that don't have any items protected to it. Azure recommends creating a new vault, and outlines a recommended workflow for disabling public network access and creating private endpoints in the following guides:

• Create and use private endpoints (v1 experience) for Azure Backup
• Create and use private endpoints (v2 experience) for Azure Backup

CIS Controls

Profile

Level 1 | Automated