STIGQter: STIG Summary: Microsoft Outlook 2016 Security Technical Implementation Guide Version: 2 Release: 1 Benchmark Date: 23 Oct 2020:

RPC encryption between Outlook and Exchange server must be enforced.

DISA Rule

SV-228466r508021_rule

Vulnerability Number

V-228466

Group Title

SRG-APP-000395

Rule Version

DTOO279

Severity

CAT II

CCI(s)

• 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.

Weight

10

Fix Recommendation

Set the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2016 -> Account Settings -> Exchange "Enable RPC encryption" to "Enabled".

Check Contents

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2016 -> 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\16.0\outlook\rpc

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

Vulnerability Number

V-228466

Documentable

False

Rule Version

DTOO279

Severity Override Guidance

Verify the policy value for User Configuration -> Administrative Templates -> Microsoft Outlook 2016 -> 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\16.0\outlook\rpc

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

Check Content Reference

M

Target Key

4224

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