RPC encryption between Outlook and Exchange server must be enforced.

From Microsoft Outlook 2013 STIG

Associated with: CCI-001967

SV-54052r1_rule RPC encryption between Outlook and Exchange server must be enforced.

Vulnerability discussion

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

Check content

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Account Settings -> Exchange "Enable RPC encryption" is set to "Enabled". Procedure: Use the Windows Registry Editor to navigate to the following key: HKCU\Software\Policies\Microsoft\Office\15.0\outlook\rpc Criteria: If the value EnableRPCEncryption is REG_DWORD = 1, this is not a finding.

Fix text

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2013 -> Account Settings -> Exchange "Enable RPC encryption" to "Enabled".

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