Container Registry should restrict network access

High Azure General acr-network-deny

Applies to

Microsoft.ContainerRegistry/registries

What CGPulse checks

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

How to fix it

Restrict network access by setting default action to Deny and adding allowed networks. In Azure Portal: Container Registry > Networking > set Default action to Deny. See: https://learn.microsoft.com/en-us/azure/container-registry/container-registry-access-selected-networks

Careful: Setting default network action to Deny blocks all connections except from allowed IPs/VNets. Requires Premium SKU

CLI

az acr update --ids "{id}" --default-action Deny

Terraform

resource "azurerm_container_registry" "{name}" {
  name                = "{name}"
  resource_group_name = "{rg}"
  location            = var.location
  sku                 = "Premium"
  network_rule_set {
    default_action = "Deny"
  }
  # Requires Premium SKU
}

Compliance frameworks

Cloud Security BaselineNS-2

Vendor documentation

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