Ensure the connection filter safe list is off

HochStufe 1Manuelle Prüfungm365

Beschreibung

In Microsoft 365 organizations with Exchange Online mailboxes or standalone Exchange Online Protection (EOP) organizations without Exchange Online mailboxes, connection filtering and the default connection filter policy identify good or bad source email servers by IP addresses. The key components of the default connection filter policy are IP Allow List, IP Block List and Safe list. The safe list is a pre-configured allow list that is dynamically updated by Microsoft. The recommended safe list state is: Off or False Without additional verification like mail flow rules, email from sources in the IP Allow List skips spam filtering and sender authentication (SPF, DKIM, DMARC) checks. This method creates a high risk of attackers successfully delivering email to the Inbox that would otherwise be filtered. Messages that are determined to be malware or high confidence phishing are filtered....

So wird geprüft

Prüfmethode: Manuelle Prüfung

Diese Empfehlung kann nicht automatisch geprüft werden. Ein Scan führt sie mit diesen Anweisungen auf, wenn Sie --include-manual übergeben.

To audit using the UI: 1. Navigate to Microsoft Defender https://security.microsoft.com. 2. Expand Email & collaboration > Policies & rules > Threat policies. 3. Under Policies select Anti-spam. 4. Click on the Connection filter policy (Default). 5. Verify that Safe list is Off. To audit using PowerShell: 1. Connect to Exchange Online using Connect-ExchangeOnline. 2. Run the following PowerShell command: Get-HostedConnectionFilterPolicy -Identity Default | fl EnableSafeList 3. Verify that EnableSafeList is False

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

To remediate using the UI: 1. Navigate to Microsoft Defender https://security.microsoft.com. 2. Expand Email & collaboration > Policies & rules> Threat policies. 3. Under Policies select Anti-spam. 4. Click on the Connection filter policy (Default). 5. Click Edit connection filter policy. 6. Uncheck Turn on safe list. 7. Click Save. To remediate using PowerShell: 1. Connect to Exchange Online using Connect-ExchangeOnline. 2. Run the following PowerShell command: Set-HostedConnectionFilterPolicy -Identity Default -EnableSafeList $false

Eigenschaften

Betriebssysteme: Beliebig
Tags: m365saas
Referenz: CIS Microsoft 365 Foundations Benchmark v7.0.0 - 2.1.13 Ensure the connection filter safe list is off