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Exchange must have the Microsoft Active Sync directory removed.


Finding ID Version Rule ID IA Controls Severity
V-234786 EX13-CA-000110 SV-234786r617299_rule Low
To reduce the vectors through which a server can be attacked, unneeded application components should be disabled or removed. By default, a virtual directory is installed for Active Sync, and the Exchange application default has Active Sync disabled. If an attacker were to intrude into an Exchange CA server and reactivate Active Sync, this attack vector could once again be open, provided the virtual directory is present. Once removed, the Active Sync functionality cannot be used without restoring the virtual directory, not a trivial process.
Microsoft Exchange 2013 Client Access Server Security Technical Implementation Guide 2021-12-16


Check Text ( C-37972r617297_chk )
Open the Exchange Management Shell and enter the following command:

Get-ActiveSyncVirtualDirectory | Select Server, Name, Identity, Path

If the value of Path (the actual directory path) exists, this is a finding.
Fix Text (F-37935r617298_fix)
Open an Exchange Command Shell and enter the following command:

Remove-ActiveSyncVirtualDirectory \Microsoft-Server-ActiveSync -Confirm $true

Note: The physical directory must also be deleted.