The Exchange Post Office Protocol 3 (POP3) service must be disabled.

From Microsoft Exchange 2016 Mailbox Server Security Technical Implementation Guide

Part of SRG-APP-000141

Associated with: CCI-000381

SV-95369r1_rule The Exchange Post Office Protocol 3 (POP3) service must be disabled.

Vulnerability discussion

POP3 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 POP3.

Check content

Open the Windows Power Shell and enter the following command: Get-ItemProperty 'hklm:\system\currentcontrolset\services\MSExchangePOP3' | Select Start Note: The hklm:\system\currentcontrolset\services\MSExchangePOP3 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 POP3 Backend". Click on the "General" tab. In the "Startup Type" dropdown, select "Disabled". Click the "OK" button.

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