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4.4.2 Ensure 'TLS Version' is set to 'TLSV1.2' for MySQL flexible Database Server (Automated)​

Profile Applicability​

• Level 1

Description​

Ensure TLS version on MySQL flexible servers is set to the default value.

Rationale​

TLS connectivity helps to provide a new layer of security by connecting database server to client applications using Transport Layer Security (TLS). Enforcing TLS connections between database server and client applications helps protect against "man in the middle" attacks by encrypting the data stream between the server and application.

Audit​

From Azure Portal​

  1. Login to Azure Portal using https://portal.azure.com
  2. Go to Azure Database for MySQL flexible servers
  3. For each database, click on Server parameters under Settings
  4. In the search box, type in tls_version
  5. Ensure tls_version is set to TLSV1.2

From Azure CLI​

Ensure the output of the below command contains the key value pair "values": "TLSV1.2".

 az mysql flexible-server parameter show --name tls_version --resource-group <resourceGroupName> --server-name <serverName>

Example output:

{
 "allowedValues": "TLSv1,TLSv1.1,TLSv1.2",
 "dataType": "Set",
 "defaultValue": "TLSv1.2",
 "description": "Which protocols the server permits for encrypted connections. By default, TLS 1.2 is enforced",
 "id": "/subscriptions/<subscriptionId>/resourceGroups/<resourceGroupName>/providers/Microsoft.DBforMySQL/flexibleServers/<serverName>/configurations/tls_version",
 "isConfigPendingRestart": "False",
 "isDynamicConfig": "False",
 "isReadOnly": "False",
 "name": "tls_version",
 "resourceGroup": "<resourceGroupName>",
 "source": "system-default",
 "systemData": null,
 "type": "Microsoft.DBforMySQL/flexibleServers/configurations",
 "value": "TLSv1.2"
}

Remediation​

From Azure Portal​

  1. Login to Azure Portal using https://portal.azure.com
  2. Go to Azure Database for MySQL flexible servers
  3. For each database, click on Server parameters under Settings
  4. In the search box, type in tls_version
  5. Click on the VALUE dropdown, and ensure only TLSV1.2 is selected for tls_version

From Azure CLI​

Use the below command to set MYSQL flexible databases to used version 1.2 for the tls_version parameter.

 az mysql flexible-server parameter set --name tls_version --resource-group <resourceGroupName> --server-name <serverName> --value TLSV1.2

Additional Information​

There are two versions of Azure Database for MySQL Flexible Server that can be used, versions 5.7 and 8.0.

For version 8.0 of Azure Database for MySQL Flexible Server TLSV1.2 is selected by default but TLSV1.3 is available and can be used instead or together with TLSV1.2.

For version 5.7 of Azure Database for MySQL Flexible Server only TLSV1.2 should be selected. Version 5.7 of Azure Database for MySQL Flexible Server will be deprecated in October 2023.

References​

https://docs.microsoft.com/en-us/azure/mysql/concepts-ssl-connection-security
https://docs.microsoft.com/en-us/azure/mysql/howto-configure-ssl
https://docs.microsoft.com/en-us/security/benchmark/azure/security-controls-v3-data-protection#dp-4-enable-data-at-rest-encryption-by-default
https://learn.microsoft.com/en-us/azure/mysql/concepts-version-policy#major-version-retirement-policy