Ensure Direct Send submissions are rejected

SedangLevel 2Tinjauan manualm365

Deskripsi

Direct Send is a method used to send emails directly to an Exchange Online customer’s hosted mailboxes from on-premises devices, applications, or third-party cloud services using the customer’s own accepted domain. This method does not require any form of authentication because, by its nature, it mimics incoming anonymous emails from the internet, apart from the sender domain. The recommended state is to configure RejectDirectSend to True. Direct Send allows devices and applications to transmit unauthenticated email directly to Exchange Online. While this method may support legacy systems such as printers or scanners, it introduces significant security risks: - Unauthenticated Email Delivery: Direct Send does not require authentication, making it an attractive vector for threat actors to deliver spoofed or malicious emails that appear to originate from trusted internal sources. - Phis...

Cara pemeriksaan

Metode audit: Tinjauan manual

Rekomendasi ini tidak dapat diperiksa secara otomatis. Pemindaian akan menampilkannya beserta petunjuk ini saat Anda memberikan opsi --include-manual.

To audit using PowerShell: 1. Connect to Exchange Online using Connect-ExchangeOnline. 2. Run the following PowerShell command: Get-OrganizationConfig | fl RejectDirectSend 3. Verify that the value returned for RejectDirectSend is True.

Cara perbaikan

Metode perbaikan: Panduan atau patch infrastruktur

To remediate using PowerShell: 1. Connect to Exchange Online using Connect-ExchangeOnline. 2. Run the following PowerShell command: Set-OrganizationConfig -RejectDirectSend $true

Properti

Sistem operasi: Apa saja
Tag: m365saas
Referensi: CIS Microsoft 365 Foundations Benchmark v7.0.0 - 6.5.5 Ensure Direct Send submissions are rejected