MSSQL server public network access enabled

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Metadata

Id: terraform-azure-mssql-server-public-network-access-enabled

Provider: Azure

Platform: Terraform

Severity: High

Category: Networking and Firewall

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Description

When MSSQL Server public network access is enabled, it allows connections from the internet to your database server, significantly expanding the attack surface and potentially exposing it to unauthorized access. This vulnerability could lead to data breaches, unauthorized data manipulation, or denial of service attacks if credentials are compromised or if there are exploitable vulnerabilities in the database server. To mitigate this risk, set public_network_access_enabled = false in your MSSQL Server configuration, which restricts access to private endpoints or services within your Azure network only.

Compliant Code Examples

resource "azurerm_mssql_server" "negative1" {
    name                         = "mssqlserver"
    resource_group_name          = azurerm_resource_group.example.name
    location                     = azurerm_resource_group.example.location
    version                      = "12.0"
    administrator_login          = "mradministrator"
    administrator_login_password = "thisIsDog11"

    extended_auditing_policy {
       storage_endpoint           = azurerm_storage_account.example.primary_blob_endpoint
       storage_account_access_key = azurerm_storage_account.example.primary_access_key
       storage_account_access_key_is_secondary = true
       retention_in_days                       = 90
    }

    public_network_access_enabled = false
}

Non-Compliant Code Examples

resource "azurerm_mssql_server" "positive1" {
    name                         = "mssqlserver"
    resource_group_name          = azurerm_resource_group.example.name
    location                     = azurerm_resource_group.example.location
    version                      = "12.0"
    administrator_login          = "mradministrator"
    administrator_login_password = "thisIsDog11"

    extended_auditing_policy {
       storage_endpoint           = azurerm_storage_account.example.primary_blob_endpoint
       storage_account_access_key = azurerm_storage_account.example.primary_access_key
       storage_account_access_key_is_secondary = true
       retention_in_days                       = 90
    }
}

resource "azurerm_mssql_server" "positive2" {
    name                         = "mssqlserver"
    resource_group_name          = azurerm_resource_group.example.name
    location                     = azurerm_resource_group.example.location
    version                      = "12.0"
    administrator_login          = "mradministrator"
    administrator_login_password = "thisIsDog11"

    extended_auditing_policy {
       storage_endpoint           = azurerm_storage_account.example.primary_blob_endpoint
       storage_account_access_key = azurerm_storage_account.example.primary_access_key
       storage_account_access_key_is_secondary = true
       retention_in_days                       = 90
    }

    public_network_access_enabled = true
}