| name | cis-azure-foundations-9.3.6 |
| description | Ensure the 'Minimum TLS version' for storage accounts is set to 'Version 1.2' |
| category | cis-azure-foundations |
| version | 5.0.0 |
| author | cyberstrike-official |
| tags | ["cis","azure","storage-accounts","tls","encryption","minimum-tls-version"] |
| cis_id | 9.3.6 |
| cis_benchmark | CIS Microsoft Azure Foundations Benchmark v5.0.0 |
| tech_stack | ["azure"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
Ensure the 'Minimum TLS version' for storage accounts is set to 'Version 1.2'
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TLS 1.0 has known vulnerabilities and has been replaced by later versions of the TLS protocol.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 Procedure
Audit from Azure Portal
- Go to
Storage Accounts.
- For each storage account, under
Settings, click Configuration.
- Ensure that the
Minimum TLS version is set to Version 1.2.
Audit 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
Audit from PowerShell
To get the minimum TLS version, run the following command:
(Get-AzStorageAccount -Name <STORAGEACCOUNTNAME> -ResourceGroupName <RESOURCEGROUPNAME>).MinimumTlsVersion
Expected Result
minimumTlsVersion should be TLS1_2 for all storage accounts.
Remediation
Remediate from Azure Portal
- Go to
Storage Accounts.
- For each storage account, under
Settings, click Configuration.
- Set the
Minimum TLS version to Version 1.2.
- Click
Save.
Remediate from Azure CLI
az storage account update \
--name <storage-account> \
--resource-group <resource-group> \
--min-tls-version TLS1_2
Remediate from PowerShell
To set the minimum TLS version, run the following command: