TMA-AZURE-COMPUTE-2.3.7
Ensure 'Minimum Inbound TLS Version' is set to '1.2' or higher
Description
The TLS (Transport Layer Security) protocol secures the transmission of data over the internet using standard encryption technology. Function apps use TLS 1.2 for the Minimum Inbound TLS Version by default and allow for the use of TLS versions 1.0, 1.1, and 1.3. NIST strongly suggests the use of TLS 1.2 and recommends the adoption of TLS 1.3. TLS 1.0 and 1.1 are outdated and vulnerable to security risks. Since TLS 1.2 and TLS 1.3 provide enhanced security and improved performance, it is highly recommended to use TLS 1.2 or higher whenever possible.
How it is checked
Audit method: Manual review
This recommendation cannot be checked automatically. A scan lists it with these instructions when you pass --include-manual.
Audit from Azure Portal 1. Go to App Services or Function App. 2. Click the name of a function app. 3. Under Settings, click Configuration. 4. In the General settings pane, under Platform settings, ensure that Minimum Inbound TLS Version is set to 1.2 or higher. 5. Repeat steps 1-4 for each function app. Audit from Azure CLI Run the following command to list function apps: az functionapp list For each function app, run the following command to get the TLS version setting: az functionapp config show --resource-group <resource-group-name> --name <function-app-name> --query minTlsVersion Ensure that "1.2" or higher is returned. Audit from PowerShell Run the following command to list function apps: Get-AzFunctionApp Run the following command to get the function app in a resource group with a given name: $app = Get-AzFunctionApp -ResourceGroupName <resource-group-name> -Name <function-app-name> Run the following command to get the TLS version setting: $app.SiteConfig.MinTlsVersion Ensure that the command returns 1.2 or higher. Repeat for each function app. Audit from Azure Policy If referencing a digital copy of this Benchmark, clicking a Policy ID will open a link to the associated...
How it is fixed
Fix method: Guidance or infrastructure patch
Remediate from Azure Portal 1. Go to App Services or Function App. 2. Click the name of a function app. 3. Under Settings, click Configuration. 4. In the General settings pane, under Platform settings, click the drop-down next to Minimum Inbound TLS Version and select 1.2 or higher. 5. Click Save. 6. Click Continue. 7. Repeat steps 1-6 for each function app requiring remediation. Remediate from Azure CLI For each function app requiring remediation, run the following command to update the TLS version: az functionapp config set --resource-group <resource-group-name> --name <function-app-name> --min-tls-version <1.2|1.3>
Properties
- Operating systems
- Any
- Tags
- azurecloudcomputetls
- Reference
- CIS Microsoft Azure Compute Services Benchmark v2.0.0 - 2.3.7 Ensure 'Minimum Inbound TLS Version' is set to '1.2' or higher