The default action on Storage account network rules should be set to deny
Default Severity: critical
Explanation
The default_action for network rules should come into effect when no other rules are matched.
The default action should be set to Deny.
Possible Impact
Network rules that allow could cause data to be exposed publicly
Suggested Resolution
Set network rules to deny
Insecure Example
The following example will fail the azure-storage-default-action-deny check.
resource "azurerm_storage_account_network_rules" "bad_example" {
default_action = "Allow"
ip_rules = ["127.0.0.1"]
virtual_network_subnet_ids = [azurerm_subnet.test.id]
bypass = ["Metrics"]
}
Secure Example
The following example will pass the azure-storage-default-action-deny check.
resource "azurerm_storage_account_network_rules" "good_example" {
default_action = "Deny"
ip_rules = ["127.0.0.1"]
virtual_network_subnet_ids = [azurerm_subnet.test.id]
bypass = ["Metrics"]
}