Email forwarding must be restricted.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-33605	Exch-1-321	SV-44025r1_rule	ECSC-1	Medium

Description
Auto-forwarded email accounts do not meet the requirement for digital signature and encryption of CUI and PII IAW DoDI 8520.2 (reference ee) and DoD Director for Administration and Management memorandum, 'Safeguarding Against and Responding to the Breach of Personally Identifiable Information. Use of forwarding set by an administrator interferes with non-repudiation requirements that each end user be responsible for creation and destination of email data.

Description

Auto-forwarded email accounts do not meet the requirement for digital signature and encryption of CUI and PII IAW DoDI 8520.2 (reference ee) and DoD Director for Administration and Management memorandum, 'Safeguarding Against and Responding to the Breach of Personally Identifiable Information. Use of forwarding set by an administrator interferes with non-repudiation requirements that each end user be responsible for creation and destination of email data.

STIG	Date
Exchange 2010 Mailbox Server STIG	2013-01-03

Details

Check Text ( C-41712r1_chk )
Access Active Directory for email enabled user accounts. Identify the 'Forward To' property. Obtain the Email Domain Security Plan (EDSP) and locate any accounts that have been authorized to have email auto-forwarded. Open the Exchange Management Shell and enter the following command: Get-Mailbox -Filter {ForwardingSMTPAddress -ne $null} If any user has a forwarding SMTP address and is not documented in the EDSP, this is a finding.

Check Text ( C-41712r1_chk )

Access Active Directory for email enabled user accounts. Identify the 'Forward To' property.

Obtain the Email Domain Security Plan (EDSP) and locate any accounts that have been authorized to have email auto-forwarded.

Open the Exchange Management Shell and enter the following command:

Get-Mailbox -Filter {ForwardingSMTPAddress -ne $null}

If any user has a forwarding SMTP address and is not documented in the EDSP, this is a finding.

Fix Text (F-37497r1_fix)
Open the Exchange Management Shell and enter the following command: Set-Mailbox -Identity <'UserWithForwardedAddress'> -ForwardingSMTPAdddress $null