Unrecommended Network Watcher Flow Log Retention Policy

  • Query id: 564b70f8-41cd-4690-aff8-bb53add86bc9
  • Query name: Unrecommended Network Watcher Flow Log Retention Policy
  • Platform: AzureResourceManager
  • Severity: Medium
  • Category: Observability
  • URL: Github

Description

Network Watcher Flow Log Retention Policy should be enabled and the recommended number of days for the retention should be higher than 90
Documentation

Code samples

Code samples with security vulnerabilities

Positive test num. 1 - json file
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "2.0.0.0",
  "apiProfile": "2019-03-01-hybrid",
  "parameters": {},
  "variables": {},
  "functions": [],
  "resources": [
    {
      "name": "flowlogs/sample",
      "type": "Microsoft.Network/networkWatchers/flowLogs",
      "apiVersion": "2020-11-01",
      "location": "location",
      "tags": {},
      "properties": {
        "targetResourceId": "targetResourceId",
        "storageId": "storageId",
        "enabled": true,
        "retentionPolicy": {
          "days": 2,
          "enabled": false
        },
        "format": {
          "type": "JSON"
        }
      }
    }
  ],
  "outputs": {}
}
Positive test num. 2 - json file
{
  "$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": [
    {
      "name": "flowlogs/sample",
      "type": "Microsoft.Network/networkWatchers/FlowLogs",
      "apiVersion": "2020-11-01",
      "location": "location",
      "tags": {},
      "properties": {
        "targetResourceId": "targetResourceId",
        "storageId": "storageId",
        "enabled": true,
        "retentionPolicy": {
          "days": 2
        },
        "format": {
          "type": "JSON"
        }
      }
    }
  ],
  "outputs": {}
}
Positive test num. 3 - 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": "flowlogs/sample",
      "type": "Microsoft.Network/networkWatchers/FlowLogs",
      "apiVersion": "2020-11-01",
      "location": "location",
      "tags": {},
      "properties": {
        "targetResourceId": "targetResourceId",
        "storageId": "storageId",
        "enabled": true,
        "format": {
          "type": "JSON"
        }
      }
    }
  ],
  "outputs": {}
}

Positive test num. 4 - json file 
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "2.0.0.0",
  "apiProfile": "2019-03-01-hybrid",
  "parameters": {},
  "variables": {},
  "functions": [],
  "resources": [
    {
      "name": "flowlogs/sample",
      "type": "Microsoft.Network/networkWatchers/FlowLogs",
      "apiVersion": "2020-11-01",
      "location": "location",
      "tags": {},
      "properties": {
        "targetResourceId": "targetResourceId",
        "storageId": "storageId",
        "retentionPolicy": {
          "days": 95,
          "enabled": true
        },
        "format": {
          "type": "JSON"
        }
      }
    }
  ],
  "outputs": {}
}
Positive test num. 5 - json file 
{
  "properties": {
    "template": {
      "$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": "flowlogs/sample",
          "type": "Microsoft.Network/networkWatchers/flowLogs",
          "apiVersion": "2020-11-01",
          "location": "location",
          "tags": {},
          "properties": {
            "targetResourceId": "targetResourceId",
            "storageId": "storageId",
            "enabled": true,
            "retentionPolicy": {
              "days": 2,
              "enabled": false
            },
            "format": {
              "type": "JSON"
            }
          }
        }
      ],
      "outputs": {}
    },
    "parameters": {}
  },
  "kind": "template",
  "type": "Microsoft.Blueprint/blueprints/artifacts",
  "name": "myTemplate"
}
Positive test num. 6 - json file 
{
  "properties": {
    "template": {
      "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
      "contentVersion": "2.0.0.0",
      "apiProfile": "2019-03-01-hybrid",
      "parameters": {},
      "variables": {},
      "functions": [],
      "resources": [
        {
          "name": "flowlogs/sample",
          "type": "Microsoft.Network/networkWatchers/FlowLogs",
          "apiVersion": "2020-11-01",
          "location": "location",
          "tags": {},
          "properties": {
            "targetResourceId": "targetResourceId",
            "storageId": "storageId",
            "enabled": true,
            "retentionPolicy": {
              "days": 2
            },
            "format": {
              "type": "JSON"
            }
          }
        }
      ],
      "outputs": {}
    },
    "parameters": {}
  },
  "kind": "template",
  "type": "Microsoft.Blueprint/blueprints/artifacts",
  "name": "myTemplate"
}
Positive test num. 7 - json file 
{
  "properties": {
    "template": {
      "$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": "flowlogs/sample",
          "type": "Microsoft.Network/networkWatchers/FlowLogs",
          "apiVersion": "2020-11-01",
          "location": "location",
          "tags": {},
          "properties": {
            "targetResourceId": "targetResourceId",
            "storageId": "storageId",
            "enabled": true,
            "format": {
              "type": "JSON"
            }
          }
        }
      ],
      "outputs": {}
    },
    "parameters": {}
  },
  "kind": "template",
  "type": "Microsoft.Blueprint/blueprints/artifacts",
  "name": "myTemplate"
}
Positive test num. 8 - 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": "flowlogs/sample",
          "type": "Microsoft.Network/networkWatchers/FlowLogs",
          "apiVersion": "2020-11-01",
          "location": "location",
          "tags": {},
          "properties": {
            "targetResourceId": "targetResourceId",
            "storageId": "storageId",
            "retentionPolicy": {
              "days": 95,
              "enabled": true
            },
            "format": {
              "type": "JSON"
            }
          }
        }
      ],
      "outputs": {}
    },
    "parameters": {}
  },
  "kind": "template",
  "type": "Microsoft.Blueprint/blueprints/artifacts",
  "name": "myTemplate"
}

Code samples without security vulnerabilities

Negative test num. 1 - json file
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "2.0.0.0",
  "apiProfile": "2019-03-01-hybrid",
  "parameters": {},
  "variables": {},
  "functions": [],
  "resources": [
    {
      "name": "flowlogs/sample",
      "type": "Microsoft.Network/networkWatchers/flowLogs",
      "apiVersion": "2020-11-01",
      "location": "location",
      "tags": {},
      "properties": {
        "targetResourceId": "targetResourceId",
        "storageId": "storageId",
        "enabled": true,
        "retentionPolicy": {
          "days": 92,
          "enabled": true
        },
        "format": {
          "type": "JSON"
        }
      }
    }
  ],
  "outputs": {}
}
Negative test num. 2 - json file
{
  "$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": [
    {
      "name": "flowlogs/sample",
      "type": "Microsoft.Network/networkWatchers/FlowLogs",
      "apiVersion": "2020-11-01",
      "location": "location",
      "tags": {},
      "properties": {
        "targetResourceId": "targetResourceId",
        "storageId": "storageId",
        "enabled": true,
        "retentionPolicy": {
          "days": 95,
          "enabled": true
        },
        "format": {
          "type": "JSON"
        }
      }
    }
  ],
  "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": [
        {
          "name": "flowlogs/sample",
          "type": "Microsoft.Network/networkWatchers/flowLogs",
          "apiVersion": "2020-11-01",
          "location": "location",
          "tags": {},
          "properties": {
            "targetResourceId": "targetResourceId",
            "storageId": "storageId",
            "enabled": true,
            "retentionPolicy": {
              "days": 92,
              "enabled": true
            },
            "format": {
              "type": "JSON"
            }
          }
        }
      ],
      "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": [
        {
          "name": "flowlogs/sample",
          "type": "Microsoft.Network/networkWatchers/FlowLogs",
          "apiVersion": "2020-11-01",
          "location": "location",
          "tags": {},
          "properties": {
            "targetResourceId": "targetResourceId",
            "storageId": "storageId",
            "enabled": true,
            "retentionPolicy": {
              "days": 95,
              "enabled": true
            },
            "format": {
              "type": "JSON"
            }
          }
        }
      ],
      "outputs": {}
    },
    "parameters": {}
  },
  "kind": "template",
  "type": "Microsoft.Blueprint/blueprints/artifacts",
  "name": "myTemplate"
}