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The Exchange Internet Message Access Protocol 4 (IMAP4) service must be disabled.


Overview

Finding ID Version Rule ID IA Controls Severity
V-80657 EX16-MB-000180 SV-95367r1_rule Medium
Description
IMAP4 is not approved for use within the DoD. It uses a clear-text-based user name and password and does not support the DoD standard for PKI for email access. User name and password could easily be captured from the network, allowing a malicious user to access other system features. Uninstalling or disabling the service will prevent the use of the IMAP4 protocol.
STIG Date
Microsoft Exchange 2016 Mailbox Server Security Technical Implementation Guide 2019-10-01

Details

Check Text ( C-80391r1_chk )
Open the Windows Power Shell and enter the following command:

Get-ItemProperty 'hklm:\system\currentcontrolset\services\MSExchangeIMAP4' | Select Start

Note: The hklm:\system\currentcontrolset\services\MSExchangeIMAP4 value must be in single quotes.

If the value of "Start" is not set to "4", this is a finding.
Fix Text (F-87511r1_fix)
Open the Windows Power Shell and enter the following command:

services.msc

Navigate to and double-click on "Microsoft Exchange IMAP4 Backend".

Click on the "General" tab.

In the "Startup Type" dropdown, select "Disabled".

Click the "OK" button.