Microsoft Exchange Server
TMA-EXCHANGE-3.2
Ensure 'Allow unmanaged devices' is set to 'False'
Description
This policy setting determines whether Exchange will allow devices that do not accept security policy updates from the Exchange server to use ActiveSync. AllowNonProvisionableDevices must be False. Prints the number of mobile device mailbox policies that do not comply (expected 0). Run on a Mailbox server; every mobile device mailbox policy is checked. Run from an Exchange Management Shell or after `Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn`; the audit loads the snap-in itself when Get-ExchangeServer is missing and fails if it cannot.
How it is checked
Audit method: Shell command
$ErrorActionPreference = 'Stop'; if (-not (Get-Command Get-ExchangeServer -ErrorAction SilentlyContinue)) { Add-PSSnapin Microsoft.Exchange.Management.PowerShell.SnapIn -ErrorAction Stop }; if (-not (Get-Command Get-ExchangeServer -ErrorAction SilentlyContinue)) { throw 'Exchange Management Shell cmdlets are not available' }; $ts = { param($v) $s = "$v"; if (-not $s -or $s -eq 'Unlimited') { $null } else { [timespan]$s } }; $num = { param($v) $s = "$v"; if ($s -match '^\d+$') { [int64]$s } else { $null } }; $bad = @(Get-MobileDeviceMailboxPolicy -ErrorAction Stop | Where-Object { $_.AllowNonProvisionableDevices -ne $false }); $bad.Count- Expected output
0
How it is fixed
Fix method: Guidance or infrastructure patch
Set-MobileDeviceMailboxPolicy '<Profile>' -AllowNonProvisionableDevices $false
Properties
- Operating systems
- Any
- Tags
- exchangemobile
- Reference
- CIS Microsoft Exchange Server 2019 Benchmark v1.0.1 - 3.2 Ensure 'Allow unmanaged devices' is set to 'False'
Check this host
Run this on a machine you are allowed to audit. The scan is read-only.
tmaegis scan --target exchange