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4.1.6 Ensure that 'Auditing' Retention is 'greater than 90 days' (Manual)

note

This rule has been changed to manual, see Manual Policies for CIS Azure 1.5.0 for details.

Profile Applicability

• Level 1

Description

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

Rationale

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

Audit

From Azure Portal

  1. Go to SQL servers
  2. For each server instance
  3. Click on Auditing
  4. If storage is selected, expand Advanced properties
  5. Ensure Retention (days) setting is greater than 90 days or 0 for unlimited retention.

From Azure Powershell

Get the list of all SQL Servers

Get-AzSqlServer

For each Server

Get-AzSqlServerAudit -ResourceGroupName <resource group name> -ServerName <server name>

Ensure that RetentionInDays is set to more than or equal to 90

note

If the SQL server is set with LogAnalyticsTargetState setting set to Enabled, run the following additional command.

Get-AzOperationalInsightsWorkspace | Where-Object {$_.ResourceId -eq <SQL Server WorkSpaceResourceId>}

Ensure that RetentionInDays is set to more than or equal to 90

Remediation

From Azure Portal

  1. Go to SQL servers
  2. For each server instance
  3. Click on Auditing
  4. If storage is selected, expand Advanced properties
  5. Set the Retention (days) setting greater than 90 days or 0 for unlimited retention.
  6. Select Save

From Azure Powershell

For each Server, set retention policy for more than or equal to 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 90days minimum> -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.Stora
ge/storageAccounts/<Storage Account name>"

References

https://docs.microsoft.com/en-us/azure/sql-database/sql-database-auditing
https://docs.microsoft.com/en-us/powershell/module/azurerm.sql/get-azurermsqlserverauditing?view=azurermps-5.2.0
https://docs.microsoft.com/en-us/powershell/module/azurerm.sql/set-azurermsqlserverauditing?view=azurermps-5.2.0
https://docs.microsoft.com/en-us/security/benchmark/azure/security-controls-v3-logging-threat-detection#lt-6-configure-log-storage-retention