WAF Policy should be in Prevention mode

High Azure General applicationgatewaywebapplicationfirewallpolicies-w-2

Applies to

Microsoft.Network/ApplicationGatewayWebApplicationFirewallPolicies

What CGPulse checks

A resource passes this rule when mode must equal Prevention. Anything else is reported as a finding with the evaluated property value attached as evidence.

How to fix it

Switch WAF to Prevention mode to actively block threats after verifying no false positives. In Azure Portal: WAF policy > switch Mode to Prevention. See: https://learn.microsoft.com/en-us/azure/web-application-firewall/ag/ag-overview#waf-modes

Careful: Prevention mode will actively block requests matching WAF rules. Verify no false positives in Detection mode first

CLI

az network application-gateway waf-policy update --ids "{id}" --set policySettings.mode=Prevention

Terraform

resource "azurerm_web_application_firewall_policy" "{name}" {
  name                = "{name}"
  resource_group_name = "{rg}"
  location            = var.location
  # WARNING: Prevention mode blocks matching requests. Test in Detection mode first
  policy_settings {
    enabled = true
    mode    = "Prevention"
  }
  managed_rules {
    managed_rule_set {
      type    = "OWASP"
      version = "3.2"
    }
  }
}

Compliance frameworks

Cloud Security: Azure Foundations

Vendor documentation

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