Cis Azure Storage 17.8

17.8 Ensure Storage Logging is Enabled for Queue Service for 'Read', 'Write', and 'Delete' requests (Automated)

Description

The Storage Queue service stores messages that may be read by any client who has access to the storage account. A queue can contain an unlimited number of messages, each of which can be up to 64KB in size using version 2011-08-18 or newer. Storage Logging happens server-side and allows details for both successful and failed requests to be recorded in the storage account. These logs allow users to see the details of read, write, and delete operations against the queues. Storage Logging log entries contain the following information about individual requests: Timing information such as start time, end-to-end latency, and server latency, authentication details, concurrency information, and the sizes of the request and response messages.

Rationale

Storage Analytics logs contain detailed information about successful and failed requests to a storage service. This information can be used to monitor individual requests and to diagnose issues with a storage service. Requests are logged on a best-effort basis.

Storage Analytics logging is not enabled by default for your storage account.

Impact

Enabling this setting can have a high impact on the cost of the log analytics service and data storage used by logging more data per each request. Do not enable this without determining your need for this level of logging, and do not forget to check in on data usage and projected cost. Some users have seen their logging costs increase from $10 per month to $10,000 per month.

Audit Procedure

Audit from Azure Portal

1. Go to Storage Accounts.
2. For each storage account, under Monitoring, click Diagnostics settings.
3. Select the queue tab indented below the storage account.
4. Ensure that at least one diagnostic setting is listed.
5. Click Edit setting on a diagnostic setting.
6. Ensure that at least one diagnostic setting has StorageRead, StorageWrite, and StorageDelete options selected under the Logs section and that they are sent to an appropriate destination.

Audit from Azure CLI

Ensure the below command's output contains properties delete, read and write set to true:

az storage logging show --services q --account-name <storageAccountName>

Audit from Azure Policy

Policy ID: 7bd000e3-37c7-4928-9f31-86c4b77c5c45 - Name: 'Configure diagnostic settings for Queue Services to Log Analytics workspace'

Expected Result

Storage logging should be enabled for Queue Service with StorageRead, StorageWrite, and StorageDelete all enabled. CLI output should show delete: true, read: true, and write: true.

Remediation

Remediate from Azure Portal

1. Go to Storage Accounts.
2. For each storage account, under Monitoring, click Diagnostics settings.
3. Select the queue tab indented below the storage account.
4. To create a new diagnostic setting, click + Add diagnostic setting. To update an existing diagnostic setting, click Edit setting on the diagnostic setting.
5. Check the boxes next to StorageRead, StorageWrite, and StorageDelete.
6. Select an appropriate destination.
7. Click Save.

Remediate from Azure CLI

Use the below command to enable the Storage Logging for Queue service:

az storage logging update --account-name <storageAccountName> --account-key <storageAccountKey> --services q --log rwd --retention 90

Default Value

By default storage account queue services are not logged.

References

1. https://docs.microsoft.com/en-us/rest/api/storageservices/about-storage-analytics-logging
2. https://docs.microsoft.com/en-us/cli/azure/storage/logging?view=azure-cli-latest
3. https://learn.microsoft.com/en-us/security/benchmark/azure/mcsb-logging-threat-detection#lt-4-enable-network-logging-for-security-investigation
4. https://docs.microsoft.com/en-us/azure/storage/queues/monitor-queue-storage?tabs=azure-portal

Additional Information

We cannot practically generalize detailed audit log requirements for every queue due to their nature and intent. This recommendation may be applicable to storage account queue services where the security is paramount.

Profile

Level 2 | Automated