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


Finding ID Version Rule ID IA Controls Severity
V-259667 EX19-MB-000065 SV-259667r942315_rule Medium
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.
Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide 2024-01-10


Check Text ( C-63406r942313_chk )
Note: This requirement applies to IMAP4. IMAP Secure is not restricted and does not apply to this requirement.

Open the Windows PowerShell and enter the following command:

Get-Service -Name MSExchangeIMAPBE,MSExchangeImap4 |Select-Object -Property Name,StartType

If ANY of the IMAP services StartType is NOT set to "Disabled", this is a finding.
Fix Text (F-63314r942314_fix)
Open the Windows PowerShell in an Elevated Prompt and enter the following commands:

Get-Service -Name MSExchangeIMAPBE,MSExchangeImap4 |ForEach-Object {Set-Service -Name $_.Name -StartupType Disabled}