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

From Microsoft Exchange 2016 Mailbox Server Security Technical Implementation Guide

Associated with: CCI-000381

SV-95367r1_rule The Exchange Internet Message Access Protocol 4 (IMAP4) service must be disabled.

Vulnerability discussion

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.

Check content

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

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.

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