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Check: DTOO279 - Outlook

Microsoft Outlook 2010 STIG: DTOO279 - Outlook (in versions v1 r13 through v1 r12)

Title

RPC encryption between Outlook and Exchange server must be enforced. (Cat II impact)

Discussion

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.

Check Content

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

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2010 -> Account Settings -> Exchange “Enable RPC encryption” to “Enabled”.

Additional Identifiers

Rule ID: SV-33493r1_rule

Vulnerability ID: V-17615

Group Title: DTOO279 - Enable RPC Encryption

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CCIs

CCIs tied to check.

Number	Definition
CCI-001967	The information system authenticates organization-defined devices and/or types of devices before establishing a local, remote, and/or network connection using bidirectional authentication that is cryptographically based.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
IA-3 (1)	Cryptographic Bidirectional Authentication