STIGQter: STIG Summary: Microsoft Office 365 ProPlus Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 23 Apr 2021:

Outlook must use remote procedure call (RPC) encryption to communicate with Microsoft Exchange servers.

DISA Rule

SV-223347r508019_rule

Vulnerability Number

V-223347

Group Title

SRG-APP-000575

Rule Version

O365-OU-000002

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".

Use the Windows Registry to navigate to the following key:

HKCU\software\policies\microsoft\office\16.0\outlook\rpc

If the value for enablerpcencryption is set to REG_DWORD = 1, this is not a finding.

Vulnerability Number

V-223347

Documentable

False

Rule Version

O365-OU-000002

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".

Use the Windows Registry to navigate to the following key:

HKCU\software\policies\microsoft\office\16.0\outlook\rpc

If the value for enablerpcencryption is set to REG_DWORD = 1, this is not a finding.

Check Content Reference

M

Target Key

4099

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