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Cis Azure Storage 17.16

DevOps & Security
cis-azure-storage-17.16

Cis Azure Storage 17.16 is an Agent Skill for devops & security published in the CyberStrikeus/CyberStrike repository on GitHub: a SKILL.md instruction file an AI agent can load to do this task.

Ensure Redundancy is set to 'geo-redundant storage (GRS)' on critical Azure Storage Accounts

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17.16 Ensure Redundancy is set to 'geo-redundant storage (GRS)' on critical Azure Storage Accounts (Automated)

Description

Geo-redundant storage (GRS) in Azure replicates data three times within the primary region using locally redundant storage (LRS) and asynchronously copies it to a secondary region hundreds of miles away. This setup ensures high availability and resilience by providing 16 nines (99.99999999999999%) durability over a year, safeguarding data against regional outages.

Rationale

Enabling GRS protects critical data from regional failures by maintaining a copy in a geographically separate location. This significantly reduces the risk of data loss, supports business continuity, and meets high availability requirements for disaster recovery.

Impact

Enabling geo-redundant storage on Azure storage accounts increases costs due to cross-region data replication.

Audit Procedure

Audit from Azure Portal

  1. Go to Storage accounts.
  2. Click on a storage account.
  3. Under Data management, click Redundancy.
  4. Ensure that Redundancy is set to Geo-redundant storage (GRS).
  5. Repeat steps 1-4 for each storage account.

Audit from Azure CLI

Run the following command to list storage accounts:

az storage account list

For each storage account, run the following command:

az storage account show --resource-group <resource-group> --name <storage-account>

Under sku, ensure that name is set to Standard_GRS.

Audit from PowerShell

Run the following command to list storage accounts:

Get-AzStorageAccount

Run the following command to get the storage account in a resource group with a given name:

$storageAccount = Get-AzStorageAccount -ResourceGroupName <resource-group> -Name <storage-account>

Run the following command to get the redundancy setting for the storage account:

$storageAccount.SKU.Name

Ensure that the command returns Standard_GRS. Repeat for each storage account.

Audit from Azure Policy

Policy ID: bf045164-79ba-4215-8f95-f8048dc1780b Name: 'Geo-redundant storage should be enabled for Storage Accounts'

Expected Result

The redundancy setting should be Geo-redundant storage (GRS) for all critical storage accounts. CLI output should show Standard_GRS under sku.name. PowerShell should return Standard_GRS.

Remediation

Remediate from Azure Portal

  1. Go to Storage accounts.
  2. Click on a storage account.
  3. Under Data management, click Redundancy.
  4. From the Redundancy drop-down menu, select Geo-redundant storage (GRS).
  5. Click Save.
  6. Repeat steps 1-5 for each storage account requiring remediation.

Remediate from Azure CLI

For each storage account requiring remediation, run the following command to enable geo-redundant storage:

az storage account update --resource-group <resource-group> --name <storage-account> --sku Standard_GRS

Remediate from PowerShell

For each storage account requiring remediation, run the following command to enable geo-redundant storage:

Set-AzStorageAccount -ResourceGroupName <resource-group> -Name <storage-account> -SkuName "Standard_GRS"

Default Value

When creating a storage account in the Azure Portal, the default redundancy setting is geo-redundant storage (GRS). Using the Azure CLI, the default is read-access geo-redundant storage (RA-GRS). In PowerShell, a redundancy level must be explicitly specified during account creation.

References

  1. https://learn.microsoft.com/en-us/azure/storage/common/storage-redundancy
  2. https://learn.microsoft.com/en-us/azure/storage/common/redundancy-migration
  3. https://learn.microsoft.com/en-us/cli/azure/storage/account?view=azure-cli-latest#az-storage-account-update
  4. https://learn.microsoft.com/en-us/powershell/module/az.storage/set-azstorageaccount?view=azps-12.4.0
  5. https://learn.microsoft.com/en-us/azure/storage/common/storage-disaster-recovery-guidance

Additional Information

When choosing the best redundancy option, weigh the trade-offs between lower costs and higher availability. Key factors to consider include:

  • The method of data replication within the primary region.
  • The replication of data from a primary to a geographically distant secondary region for protection against regional disasters (geo-replication).
  • The necessity for read access to replicated data in the secondary region during an outage in the primary region (geo-replication with read access).

Profile

Level 2 | Automated