Application Gateway should use TLS 1.2 or higher

Applies to

• Microsoft.Network/applicationGateways

What CGPulse checks

A resource passes this rule when sslPolicy.minProtocolVersion must be one of ["TLSv1_2","TLSv1_3"]. Anything else is reported as a finding with the evaluated property value attached as evidence.

How to fix it

Set minimum TLS version to 1.2 to prevent protocol downgrade attacks. In Azure Portal: Application Gateway > Listeners > SSL settings > set Minimum TLS version to 1.2. See: https://learn.microsoft.com/en-us/azure/application-gateway/application-gateway-ssl-policy-overview

CLI

az network application-gateway ssl-policy set --gateway-name "{name}" -g "{rg}" --policy-type Predefined --policy-name AppGwSslPolicy20220101

Terraform

resource "azurerm_application_gateway" "{name}" {
  name                = "{name}"
  resource_group_name = "{rg}"
  location            = var.location
  ssl_policy {
    policy_type          = "Predefined"
    policy_name          = "AppGwSslPolicy20220101"
    min_protocol_version = "TLSv1_2"
  }
}

Compliance frameworks

• Cloud Security BaselineDP-3

Related Azure rules

• Action Group should be enabled
• Activity Log Alert should be enabled
• AKS cluster logs should be sent to Log Analytics
• AKS cluster must enable RBAC
• AKS cluster must enable RBAC
• AKS cluster should be a private cluster
• AKS cluster should disable local accounts
• AKS cluster should enable Azure RBAC for Kubernetes