Web PubSub should disable public network access

High Azure General webpubsub-no-public-access

Applies to

Microsoft.SignalRService/webPubSub

What CGPulse checks

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

How to fix it

Disable public network access to prevent unauthorized internet exposure. In Azure Portal: Web PubSub > Networking > set Public network access to Disabled. See: https://learn.microsoft.com/en-us/azure/azure-web-pubsub/howto-secure-network-access-control

Careful: Disabling public access requires a Private Endpoint for connectivity. Ensure private endpoint is configured first

CLI

az webpubsub update --ids "{id}" --set publicNetworkAccess=Disabled

Terraform

# WARNING: Ensure a private endpoint is configured before disabling public access
resource "azurerm_web_pubsub" "{name}" {
  name                          = "{name}"
  resource_group_name           = "{rg}"
  location                      = var.location
  sku                           = "Standard_S1"
  capacity                      = 1
  public_network_access_enabled = false
}

Compliance frameworks

Cloud Security: Azure Foundations

Vendor documentation

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