Exchange must have the Microsoft Active Sync directory removed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-69759	EX13-CA-000110	SV-84381r1_rule		Low

Description
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.

Description

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.

STIG	Date
MS Exchange 2013 Client Access Server Security Technical Implementation Guide	2019-12-18

Details

Check Text ( C-70205r1_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-75967r1_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.