SQL Database Server Firewall Allows All IPS

• Query id: 6a3201a5-1630-494b-b294-3129d06b0eca
• Query name: SQL Database Server Firewall Allows All IPS
• Platform: AzureResourceManager
• Severity: High
• Category: Networking and Firewall
• URL: Github

Description

SQL Database Server Firewall endIpAddress should not be '255.255.255.255' when startIpAddress is '0.0.0.0' since this allows all IPS
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - json file

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "2.0.0.0",
  "apiProfile": "2019-03-01-hybrid",
  "parameters": {},
  "variables": {},
  "functions": [],
  "resources": [
    {
      "name": "sqlServer1",
      "type": "Microsoft.Sql/servers",
      "apiVersion": "2021-02-01-preview",
      "location": "[resourceGroup().location]",
      "tags": {
        "displayName": "sqlServer1"
      },
      "properties": {
        "administratorLogin": "adminUsername",
        "administratorLoginPassword": "adminPassword"
      },
      "resources": [
        {
          "type": "firewallRules",
          "apiVersion": "2021-02-01-preview",
          "dependsOn": [
            "[resourceId('Microsoft.Sql/servers', 'sqlServer1')]"
          ],
          "location": "[resourceGroup().location]",
          "name": "AllowAllWindowsAzureIps",
          "properties": {
            "endIpAddress": "255.255.255.255",
            "startIpAddress": "0.0.0.0"
          }
        }
      ]
    }
  ],
  "outputs": {}
}

Positive test num. 2 - json file

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "2.0.0.0",
  "apiProfile": "2019-03-01-hybrid",
  "parameters": {},
  "variables": {},
  "functions": [],
  "resources": [
    {
      "type": "Microsoft.Sql/servers/firewallRules",
      "apiVersion": "2021-02-01-preview",
      "name": "sample/firewall",
      "properties": {
        "endIpAddress": "255.255.255.255",
        "startIpAddress": "0.0.0.0/0"
      }
    }
  ],
  "outputs": {}
}

Positive test num. 3 - json file

{
  "properties": {
    "template": {
      "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
      "contentVersion": "2.0.0.0",
      "apiProfile": "2019-03-01-hybrid",
      "parameters": {},
      "variables": {},
      "functions": [],
      "resources": [
        {
          "name": "sqlServer1",
          "type": "Microsoft.Sql/servers",
          "apiVersion": "2021-02-01-preview",
          "location": "[resourceGroup().location]",
          "tags": {
            "displayName": "sqlServer1"
          },
          "properties": {
            "administratorLogin": "adminUsername",
            "administratorLoginPassword": "adminPassword"
          },
          "resources": [
            {
              "type": "firewallRules",
              "apiVersion": "2021-02-01-preview",
              "dependsOn": [
                "[resourceId('Microsoft.Sql/servers', 'sqlServer1')]"
              ],
              "location": "[resourceGroup().location]",
              "name": "AllowAllWindowsAzureIps",
              "properties": {
                "endIpAddress": "255.255.255.255",
                "startIpAddress": "0.0.0.0"
              }
            }
          ]
        }
      ],
      "outputs": {}
    },
    "parameters": {}
  },
  "kind": "template",
  "type": "Microsoft.Blueprint/blueprints/artifacts",
  "name": "myTemplate"
}

Positive test num. 4 - json file

{
  "properties": {
    "template": {
      "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
      "contentVersion": "2.0.0.0",
      "apiProfile": "2019-03-01-hybrid",
      "parameters": {},
      "variables": {},
      "functions": [],
      "resources": [
        {
          "type": "Microsoft.Sql/servers/firewallRules",
          "apiVersion": "2021-02-01-preview",
          "name": "sample/firewall",
          "properties": {
            "endIpAddress": "255.255.255.255",
            "startIpAddress": "0.0.0.0/0"
          }
        }
      ],
      "outputs": {}
    },
    "parameters": {}
  },
  "kind": "template",
  "type": "Microsoft.Blueprint/blueprints/artifacts",
  "name": "myTemplate"
}

Code samples without security vulnerabilities

Negative test num. 1 - json file

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "2.0.0.0",
  "apiProfile": "2019-03-01-hybrid",
  "parameters": {},
  "variables": {},
  "functions": [],
  "resources": [
    {
      "type": "Microsoft.Sql/servers/firewallRules",
      "apiVersion": "2021-02-01-preview",
      "name": "sample/firewall",
      "properties": {
        "endIpAddress": "0.0.0.0",
        "startIpAddress": "0.0.0.0"
      }
    }
  ],
  "outputs": {}
}

Negative test num. 2 - json file

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "2.0.0.0",
  "apiProfile": "2019-03-01-hybrid",
  "parameters": {},
  "variables": {},
  "functions": [],
  "resources": [
    {
      "type": "Microsoft.Sql/servers/firewallRules",
      "apiVersion": "2021-02-01-preview",
      "name": "sample/firewall",
      "properties": {
        "endIpAddress": "192.168.1.2",
        "startIpAddress": "192.168.1.254"
      }
    }
  ],
  "outputs": {}
}

Negative test num. 3 - json file

{
  "properties": {
    "template": {
      "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
      "contentVersion": "2.0.0.0",
      "apiProfile": "2019-03-01-hybrid",
      "parameters": {},
      "variables": {},
      "functions": [],
      "resources": [
        {
          "type": "Microsoft.Sql/servers/firewallRules",
          "apiVersion": "2021-02-01-preview",
          "name": "sample/firewall",
          "properties": {
            "endIpAddress": "0.0.0.0",
            "startIpAddress": "0.0.0.0"
          }
        }
      ],
      "outputs": {}
    },
    "parameters": {}
  },
  "kind": "template",
  "type": "Microsoft.Blueprint/blueprints/artifacts",
  "name": "myTemplate"
}

Negative test num. 4 - json file

{
  "properties": {
    "template": {
      "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
      "contentVersion": "2.0.0.0",
      "apiProfile": "2019-03-01-hybrid",
      "parameters": {},
      "variables": {},
      "functions": [],
      "resources": [
        {
          "type": "Microsoft.Sql/servers/firewallRules",
          "apiVersion": "2021-02-01-preview",
          "name": "sample/firewall",
          "properties": {
            "endIpAddress": "192.168.1.2",
            "startIpAddress": "192.168.1.254"
          }
        }
      ],
      "outputs": {}
    },
    "parameters": {}
  },
  "kind": "template",
  "type": "Microsoft.Blueprint/blueprints/artifacts",
  "name": "myTemplate"
}