RPC encryption between Outlook and Exchange server must be enforced.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-17615	DTOO279 - Outlook	SV-33493r1_rule	ECSC-1	Medium

Description
The remote procedure call (RPC) communication channel between an Outlook client computer and an Exchange server is not encrypted. If a malicious person is able to eavesdrop on the network traffic between Outlook and the server, they might be able to access confidential information.

STIG	Date
Microsoft Outlook 2010	2015-09-17

Details

Check Text ( C-33976r1_chk )
The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Account Settings -> Exchange “Enable RPC encryption” must be set to “Enabled”. Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\14.0\outlook\rpc Criteria: If the value EnableRPCEncryption is REG_DWORD = 1, this is not a finding.

Check Text ( C-33976r1_chk )

The policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Account Settings -> Exchange “Enable RPC encryption” must be set to “Enabled”.

Procedure: Use the Windows Registry Editor to navigate to the following key:

HKCU\Software\Policies\Microsoft\Office\14.0\outlook\rpc

Criteria: If the value EnableRPCEncryption is REG_DWORD = 1, this is not a finding.

Fix Text (F-29660r1_fix)
Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Account Settings -> Exchange “Enable RPC encryption” to “Enabled”.