Control: 5.1.4 Ensure the storage account containing the container with activity logs is encrypted with BYOK (Use Your Own Key)

Description

The storage account with the activity log export container is configured to use BYOK (Use Your Own Key).

Configuring the storage account with the activity log export container to use BYOK (Use Your Own Key) provides additional confidentiality controls on log data as a given user must have read permission on the corresponding storage account and must be granted decrypt permission by the CMK.

By default, for a storage account keySource is set to Microsoft.Storage allowing encryption with vendor Managed key and not the BYOK (Use Your Own Key).

Remediation

From Console

1. In right column, Click service Storage Accounts to access Storage account blade
2. Click on the storage account name
3. In Section Security + networking click Encryption. It will show Storage service encryption configuration pane
4. In Encryption selection check Customer-managed keys is selected.
5. Use option Enter Key URIor Select from Key Vault to set up encryption with your own key

From Command Line

az storage account update --name <name of the storage account> --resourcegroup <resource group for a storage account> --encryption-keysource=Microsoft Keyvault --encryption-key-vault <Key Valut URI> --encryption-key-name <KeyName> --encryption-key-version <Key Version>