Network watcher flow disabled

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Metadata

Id: terraform-azure-network-watcher-flow-disabled

Provider: Azure

Platform: Terraform

Severity: Medium

Category: Insecure Configurations

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Description

This check ensures that the enabled attribute in the azurerm_network_watcher_flow_log resource is set to true, which activates flow logging for the associated network security group. Disabling flow logs by setting enabled = false can result in a lack of visibility into network traffic, making it difficult to detect and investigate security incidents and unauthorized access attempts in Azure environments. To maintain proper monitoring and auditing, the flow log should be enabled, as shown below:

resource "azurerm_network_watcher_flow_log" "secure_example" {
  network_watcher_name       = azurerm_network_watcher.test.name
  resource_group_name        = azurerm_resource_group.test.name
  network_security_group_id  = azurerm_network_security_group.test.id
  storage_account_id         = azurerm_storage_account.test.id
  enabled                    = true

  retention_policy {
    enabled = true
    days    = 7
  }
}

Compliant Code Examples

resource "azurerm_network_watcher_flow_log" "negative1" {
  network_watcher_name = azurerm_network_watcher.test.name
  resource_group_name  = azurerm_resource_group.test.name

  network_security_group_id = azurerm_network_security_group.test.id
  storage_account_id        = azurerm_storage_account.test.id
  enabled                   = true

  retention_policy {
    enabled = true
    days    = 7
  }
}

Non-Compliant Code Examples

resource "azurerm_network_watcher_flow_log" "positive1" {
  network_watcher_name = azurerm_network_watcher.test.name
  resource_group_name  = azurerm_resource_group.test.name

  network_security_group_id = azurerm_network_security_group.test.id
  storage_account_id        = azurerm_storage_account.test.id
  enabled                   = false

  retention_policy {
    enabled = true
    days    = 7
  }
}