Control: 5.1.6 Ensure that 'Auditing' Retention is 'greater than 90 days'

Description

SQL Server Audit Retention should be configured to be greater than 90 days.

Audit Logs can be used to check for anomalies and give insight into suspected breaches or misuse of information and access.

Remediation

From Azure Portal

Go to SQL servers.
For each SQL server, under Security, click Auditing.
If Storage is checked, expand Advanced properties.
Set Retention (days) to a value greater than 90, or 0 for unlimited retention.
Click Save.

From PowerShell

For each Server, set retention policy to more than 90 days

Log Analytics Example

Set-AzSqlServerAudit -ResourceGroupName <resource group name> -ServerName <SQL Server name> -RetentionInDays <Number of Days to retain the audit logs, should be more than 90 days> -LogAnalyticsTargetState Enabled -WorkspaceResourceId "/subscriptions/<subscription ID>/resourceGroups/insights-integration/providers/Microsoft.OperationalInsights/workspaces/<workspace name>

Event Hub Example

Set-AzSqlServerAudit -ResourceGroupName "<resource group name>" -ServerName "<SQL Server name>" -EventHubTargetState Enabled -EventHubName "<Event Hub name>" -EventHubAuthorizationRuleResourceId "<Event Hub Authorization Rule Resource ID>"

Blob Storage Example

Set-AzSqlServerAudit -ResourceGroupName "<resource group name>" -ServerName "<SQL Server name>" -BlobStorageTargetState Enabled -StorageAccountResourceId "/subscriptions/<subscription_ID>/resourceGroups/<Resource_Group>/providers/Microsoft.Storage/storageAccounts/<Storage Account name>"

Default Value

By default, SQL Server audit storage is disabled.

Usage

Run the control in your terminal:

powerpipe control run azure_compliance.control.cis_v300_5_1_6

Snapshot and share results via Turbot Pipes:

powerpipe login
powerpipe control run azure_compliance.control.cis_v300_5_1_6 --share

SQL

This control uses a named query:

sql_server_auditing_retention_period_90