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3.15 Ensure the "Minimum TLS version" for storage accounts is set to "Version 1.2" (Automated)​

Profile Applicability​

• Level 1

Description​

In some cases, Azure Storage sets the minimum TLS version to be version 1.0 by default. TLS 1.0 is a legacy version and has known vulnerabilities. This minimum TLS version can be configured to be later protocols such as TLS 1.2.

Rationale​

TLS 1.0 has known vulnerabilities and has been replaced by later versions of the TLS protocol. Continued use of this legacy protocol affects the security of data in transit.

Impact​

When set to TLS 1.2 all requests must leverage this version of the protocol. Applications leveraging legacy versions of the protocol will fail.

Audit​

From Azure Console​

  1. Login to Azure Portal using https://portal.azure.com
  2. Go to Storage Accounts
  3. Click on each Storage Account
  4. Under Setting section, Click on Configuration
  5. Ensure that the minimum TLS version is set to be Version 1.2

From Azure CLI​

Get a list of all storage accounts and their resource groups

az storage account list | jq '.[] | {name, resourceGroup}'

Then query the minimumTLSVersion field

az storage account show \
 --name <storage-account> \
 --resource-group <resource-group> \
 --query minimumTlsVersion \
 --output tsv

From Azure Powershell​

To get the minimum TLS version, run the following command:

(Get-AzStorageAccount -Name <STORAGEACCOUNTNAME> -ResourceGroupName <RESOURCEGROUPNAME>).MinimumTlsVersion

Remediation​

From Azure Console​

  1. Login to Azure Portal using https://portal.azure.com
  2. Go to Storage Accounts
  3. Click on each Storage Account
  4. Under Setting section, Click on Configuration
  5. Set the minimum TLS version to be Version 1.2

From Azure CLI​

az storage account update \
 --name <storage-account> \
 --resource-group <resource-group> \
 --min-tls-version TLS1_2

From Azure Powershell​

To set the minimum TLS version, run the following command:

Set-AzStorageAccount -AccountName <STORAGEACCOUNTNAME> `
 -ResourceGroupName <RESOURCEGROUPNAME> `
 -MinimumTlsVersion TLS1_2

References​

https://docs.microsoft.com/en-us/azure/storage/common/transport-layer-security-configure-minimum-version?tabs=portal
https://docs.microsoft.com/en-us/security/benchmark/azure/security-controls-v3-data-protection#dp-3-encrypt-sensitive-data-in-transit