Ensure SMTP AUTH is disabled

中レベル 1手動レビューm365

説明

This setting enables or disables authenticated client SMTP submission (SMTP AUTH) at an organization level in Exchange Online. The recommended state is Turn off SMTP AUTH protocol for your organization (checked). SMTP AUTH is a legacy protocol. Disabling it at the organization level supports the principle of least functionality and serves to further back additional controls that block legacy protocols, such as in Conditional Access. Virtually all modern email clients that connect to Exchange Online mailboxes in Microsoft 365 can do so without using SMTP AUTH.

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。

To audit using the UI: 1. Navigate to Exchange admin center https://admin.exchange.microsoft.com. 2. Expand Settings and select Mail flow. 3. Ensure Turn off SMTP AUTH protocol for your organization is checked. To audit using PowerShell: 1. Connect to Exchange Online using Connect-ExchangeOnline. 2. Run the following PowerShell command: Get-TransportConfig | Format-List SmtpClientAuthenticationDisabled 3. Verify that the value returned is True.

修正方法

修正方法: ガイダンスまたは IaC パッチ

To remediate using the UI: 1. Navigate to Exchange admin center https://admin.exchange.microsoft.com. 2. Expand Settings and select Mail flow. 3. Check Turn off SMTP AUTH protocol for your organization to disable the protocol. To remediate using PowerShell: 1. Connect to Exchange Online using Connect-ExchangeOnline. 2. Run the following PowerShell command: Set-TransportConfig -SmtpClientAuthenticationDisabled $true

プロパティ

オペレーティングシステム: すべて
タグ: authm365saas
参照: CIS Microsoft 365 Foundations Benchmark v7.0.0 - 6.5.4 Ensure SMTP AUTH is disabled