The Microsoft Active Sync directory must be removed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
EXCH-CA-102	EXCH-CA-102	EXCH-CA-102_rule		Medium

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 Front-End 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 Front-End 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
Microsoft Exchange 2010 Client Access Server Role	2012-05-31

Details

Check Text ( C-_chk )
Open the Exchange Management Shell and enter the following command. Get-ActiveSyncVirtualDirectory \| Select Server, Name, Identity, Path If the value of "Path" (actual directory) exists, this is a finding.

Fix Text (F-_fix)
Open an Exchange Command Shell and enter the following command. Remove-ActiveSyncVirtualDirectory ServerName\Microsoft-Server-Active-Sync -Confirm $true Note: The physical directory must also be deleted.