Ensure the connection filter IP allow list is empty

SrednjaNivo 1Automatskam365

Opis

Mail from IPs on the connection filter allow list skips spam filtering, so a compromised or shared IP becomes a phishing channel. Requires an already-connected Exchange Online session: Install-Module ExchangeOnlineManagement; Connect-ExchangeOnline (View-Only Organization Management is sufficient). The audit throws if no session exists.

Kako se proverava

Metod provere: Komanda ljuske

shell

$ErrorActionPreference = 'Stop'; if (-not (Get-Command Get-ConnectionInformation -ErrorAction SilentlyContinue) -or -not (Get-ConnectionInformation)) { throw 'Not connected: run Connect-ExchangeOnline first' }; $p = Get-HostedConnectionFilterPolicy -Identity Default -ErrorAction Stop; @($p.IPAllowList | Where-Object { $_ }).Count

Očekivani izlaz: 0

Kako se ispravlja

Metod ispravke: Smernica ili zakrpa infrastrukture

Set-HostedConnectionFilterPolicy -Identity Default -IPAllowList @{} (use mail flow rules or Tenant Allow/Block List entries for justified exceptions).

Svojstva

Operativni sistemi: Bilo koji
Oznake: m365mail-flow
Referenca: CIS Microsoft 365 Foundations Benchmark v7.0.0 - Exchange Online Protection / Connection filter IP allow list (verify section number for your release)

Proverite ovaj računar

Pokrenite ovo na računaru za koji imate dozvolu za proveru. Skeniranje radi u režimu samo za čitanje.

shell

tmaegis scan --target m365