Detections
Analytics

5.1.2 Ensure Diagnostic Setting captures appropriate categories

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Information

The diagnostic setting should be configured to log the appropriate activities from the control/management plane.

Rationale:

A diagnostic setting controls how the diagnostic log is exported. Capturing the diagnostic setting categories for appropriate control/management plane activities allows proper alerting.

NOTE: Nessus has not performed this check. Please review the benchmark to ensure target compliance.

Solution

From Azure Console

Go to Azure Monitor

Click Activity log

Click on Diagnostic settings

Click on Edit Settings for the diagnostic settings entry

Ensure that the following categories are checked: Administrative, Alert, Policy, and Security

Using ARM Template via AZ PowerShell cmdlets
Create a file to hold the JSON

{
 '$schema': 'https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#',
 'contentVersion': '1.0.0.0',
 'parameters': {
 'settingName': {
 'type': 'String'
 },
 'workspaceId': {
 'type': 'String'
 }
 },
 'resources': [
 {
 'type': 'Microsoft.Insights/diagnosticSettings',
 'apiVersion': '2017-05-01-preview',
 'name': '[parameters('settingName')]',
 'dependsOn': [],
 'properties': {
 'workspaceId': '[parameters('workspaceId')]',
 'logs': [
 {
 'category': 'Administrative',
 'enabled': true
 },
 {
 'category': 'Alert',
 'enabled': true
 },
 {
 'category': 'Autoscale',
 'enabled': false
 },
 {
 'category': 'Policy',
 'enabled': true
 },
 {
 'category': 'Recommendation',
 'enabled': false
 },
 {
 'category': 'ResourceHealth',
 'enabled': false
 },
 {
 'category': 'Security',
 'enabled': true
 },
 {
 'category': 'ServiceHealth',
 'enabled': false
 }
 ]
 }
 }
 ]
}

Reference the JSON in the New-AzSubscriptionDeployment call

$OMSWorkspace = Get-AzResource -ResourceType 'Microsoft.OperationalInsights/workspaces' -Name <Workspace Name>
New-AzSubscriptionDeployment -Name CreateDiagnosticSetting -location eastus -TemplateFile CreateDiagnosticSetting.jsonc -settingName 'Send Activity log to workspace' -workspaceId $OMSWorkspace.ResourceId

Default Value:

When the diagnostic setting is created using Azure Portal, by default no categories are selected.

See Also

https://workbench.cisecurity.org/files/3459

Item Details

References: CSCv7|6.3

Plugin: microsoft_azure

Control ID: fa2bf93be3fc1b405afeac408ad02ea02c9fe0ee3c31956e14a2fb566e0d1f1a