|   Trend Micro Cloud One™
Open menu

Enable Soft Delete for Azure Blob Storage

Cloud Conformity allows you to automate the auditing process of this resolution page. Register for a 14 day evaluation and check your compliance level for free!

Start a Free Trial Product features
Last updated: 12 August 2020
Risk level: Medium (should be achieved)
Rule ID: StorageAccounts-010

Ensure that Soft Delete feature is enabled for all your Microsoft Azure Storage blob objects (blobs and snapshots). Soft Delete enables you to save and recover blob data in case your Azure Storage blobs or blob snapshots are deleted. This extra layer of protection also extends to the Microsoft Azure blob data that is erased as the result of an overwrite operation. With Soft Delete feature enabled, when blob objects are deleted, they are transitioned to a soft deleted state instead of being permanently erased. When blob objects are overwritten, soft deleted snapshots are created to save the state of the overwritten blob data.

This rule resolution is part of the Cloud Conformity Security & Compliance tool for Azure

Reliability

Ensure that Soft Delete feature is enabled for all your Microsoft Azure Storage blob objects (blobs and snapshots). Soft Delete enables you to save and recover blob data in case your Azure Storage blobs or blob snapshots are deleted. This extra layer of protection also extends to the Microsoft Azure blob data that is erased as the result of an overwrite operation. With Soft Delete feature enabled, when blob objects are deleted, they are transitioned to a soft deleted state instead of being permanently erased. When blob objects are overwritten, soft deleted snapshots are created to save the state of the overwritten blob data.

Audit

Once enabled, the Soft Delete feature provides soft delete behavior for Azure blob objects in order to recover your blob data more easily in case this is erroneously modified or deleted by one of your applications or by one of your storage account users.

Using Azure Portal

01 Sign in to Azure Management Console.

02 Navigate to Azure Storage accounts blade at https://portal.azure.com/#blade/HubsExtension/BrowseResourceBlade/resourceType/Microsoft.Storage%2FStorageAccounts.

03 On the Storage accounts page, select the subscription that you want to examine from the Subscription filter box.

04 Click on the name of the Azure Storage account that you want to examine.

05 In the navigation panel, under Blob service, click Data Protection to access the Soft Delete feature configuration settings.

06 On the Data Protection page, check the Turn on soft delete for blobs configuration setting. If the setting is not checked, the Soft Delete data protection feature is not enabled for the selected Microsoft Azure Storage account.

07 Repeat steps no. 4 – 6 for each storage account available in the selected Azure subscription.

08 Repeat steps no. 3 – 7 for each subscription created within your Microsoft Azure cloud account.

Using Azure CLI

01 Run storage account list command (Windows/macOS/Linux) using custom query filters to describe the identifier for each storage account available in the current Azure subscription:

az storage account list
    --query '[*].name'

02 The command output should return the requested storage account identifiers (names):

[
  "abcd1234abcd1234abcd1234",
  "abcdabcdabcd123412341234"
]

03 Run storage blob service-properties delete-policy show command (Windows/macOS/Linux) using the name of the storage account that you want to examine as identifier parameter and custom query filters to describe the Soft Delete feature status set for the selected Azure Storage account:

az storage blob service-properties delete-policy show
    --account-name abcd1234abcd1234abcd1234
    --query 'enabled'

04 The command output should return the requested configuration status (true for enabled, false for disabled):

false

If the storage blob service-properties delete-policy show command output returns false, as shown in the example above, the Soft Delete feature is not enabled for the selected Microsoft Azure Storage account.

05 Repeat step no. 3 and 4 for each storage account provisioned in the current subscription.

06 Repeat steps no. 1 – 5 for each subscription available in your Microsoft Azure cloud account.

Remediation / Resolution

To enable Soft Delete protection feature for all your Azure Storage blob objects, perform the following actions:

Using Azure Portal

01 Sign in to Azure Management Console.

02 Navigate to Azure Storage accounts blade at https://portal.azure.com/#blade/HubsExtension/BrowseResourceBlade/resourceType/Microsoft.Storage%2FStorageAccounts.

03 On the Storage accounts page, select the Azure subscription that you want to access from the Subscription filter box.

04 Click on the name of the Azure Storage account that you want to reconfigure.

05 In the navigation panel, under Blob service, click Data Protection to access the Soft Delete feature configuration settings.

06 On the Data Protection page, perform the following operations:

  1. Check the Turn on soft delete for blobs configuration setting to enable the Soft Delete data protection feature for the selected storage account.
  2. Enter the optimal data retention period in the Keep deleted blobs for (in days) box. The retention period represents the amount of time that soft deleted data is stored and available for recovery.
  3. Click Save to apply the configuration changes.

07 Repeat steps no. 4 – 6 for each storage account available in the selected Azure subscription.

08 Repeat steps no. 3 – 7 for each subscription created within your Microsoft Azure cloud account.

Using Azure CLI

01 Run storage blob service-properties delete-policy update command (Windows/macOS/Linux) using the name of the storage account that you want to reconfigure as identifier parameter to enable the Soft Delete feature for the selected Microsoft Azure Storage account, and configure it to retain soft deleted data for a sufficient number of days (in this case 30 days):

az storage blob service-properties delete-policy update
    --account-name abcd1234abcd1234abcd1234
    --enable true
    --days-retained 30

02 The command output should return the configuration metadata for the storage blob service-properties delete-policy update command request:

{
  "enabled": true,
  "days": 30
}

03 Repeat step no. 1 and 2 for each storage account available within the current subscription.

04 Repeat steps no. 1 – 3 for each subscription available in your Microsoft Azure cloud account.

References

Publication date Dec 17, 2019

Unlock the Remediation Steps

Gain free unlimited access to our full Knowledge Base


Over 600 rules & best practices for and

Get started for FREE

A verification email will be sent to this address
We keep your information private. Learn more.

Thank you!

Please click the link in the confirmation email sent to

You are auditing:

Enable Soft Delete for Azure Blob Storage

Risk level: Medium