TMA-AZURE-9.3.8
Ensure that 'Allow Blob Anonymous Access' is Set to 'Disabled'
説明
The Azure Storage setting ‘Allow Blob Anonymous Access’ (aka "allowBlobPublicAccess") controls whether anonymous access is allowed for blob data in a storage account. When this property is set to True, it enables public read access to blob data, which can be convenient for sharing data but may carry security risks. When set to False, it disallows public access to blob data, providing a more secure storage environment. If "Allow Blob Anonymous Access" is enabled, blobs can be accessed by adding the blob name to the URL to see the contents. An attacker can enumerate a blob using methods, such as brute force, and access them. Exfiltration of data by brute force enumeration of items from a storage account may occur if this setting is set to 'Enabled'.
チェック方法
監査方法: 手動レビュー
この推奨事項は自動ではチェックできません。--include-manual を指定すると、スキャン結果にこの手順付きで一覧表示されます。
Audit from Azure Portal 1. Go to Storage Accounts. 2. For each storage account, under Settings, click Configuration. 3. Ensure Allow Blob Anonymous Access is set to Disabled. Audit from Azure CLI For every storage account in scope: az storage account show --name "<yourStorageAccountName>" --query allowBlobPublicAccess Ensure that every storage account in scope returns false for the "allowBlobPublicAccess" setting. Audit from Azure Policy If referencing a digital copy of this Benchmark, clicking a Policy ID will open a link to the associated Policy definition in Azure. If referencing a printed copy, you can search Policy IDs from this URL: https://portal.azure.com/#view/Microsoft_Azure_Policy/PolicyMenuBlade/~/Definitions - Policy ID: 4fa4b6c0-31ca-4c0d-b10d-24b96f62a751 - Name: 'Storage account public access should be disallowed'
修正方法
修正方法: ガイダンスまたは IaC パッチ
Remediate from Azure Portal 1. Go to Storage Accounts. 2. For each storage account, under Settings, click Configuration. 3. Set Allow Blob Anonymous Access to Disabled. 4. Click Save. Remediate from Powershell For every storage account in scope, run the following: $storageAccount = Get-AzStorageAccount -ResourceGroupName "<yourResourceGroup>" -Name "<yourStorageAccountName>" $storageAccount.AllowBlobPublicAccess = $false Set-AzStorageAccount -InputObject $storageAccount
プロパティ
- オペレーティングシステム
- すべて
- タグ
- access-controlazurecloud
- 参照
- CIS Microsoft Azure Foundations Benchmark v6.0.0 - 9.3.8 Ensure that 'Allow Blob Anonymous Access' is Set to 'Disabled'