Active hyperlinks in messages from non .mil domains must be rendered unclickable.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-259608	EX19-ED-000122	SV-259608r961161_rule		Medium

Description
Active hyperlinks within an email are susceptible to attacks of malicious software or malware. The hyperlink could lead to a malware infection or redirect the website to another fraudulent website without the user's consent or knowledge. Exchange does not have a built-in message filtering capability. DOD Enterprise Email (DEE) has created a custom resolution to filter messages from non-.mil users that have hyperlinks in the message body. The hyperlink within the messages will be modified, preventing end users from automatically clicking links.

Description

Active hyperlinks within an email are susceptible to attacks of malicious software or malware. The hyperlink could lead to a malware infection or redirect the website to another fraudulent website without the user's consent or knowledge. Exchange does not have a built-in message filtering capability. DOD Enterprise Email (DEE) has created a custom resolution to filter messages from non-.mil users that have hyperlinks in the message body. The hyperlink within the messages will be modified, preventing end users from automatically clicking links.

STIG	Date
Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide	2024-06-10

Details

Check Text ( C-63347r942136_chk )
Note: If using another DOD-approved anti-spam product for email or a DOD-approved Email Gateway spamming device, such as Enterprise Email Security Gateway (EEMSG), this is not applicable. Note: If system is on SIPRNet, this is not applicable. Review the Email Domain Security Plan (EDSP). Determine the name of the Transport Agent. Open the Windows PowerShell console and enter the following command: Get-TransportAgent -Name 'customAgent' \| Format-List If the value does not return "customAgent", this is a finding. Note: "customAgent" is the name of the custom agent developed to render hyperlink email sources from non .mil domains as unclickable.

Check Text ( C-63347r942136_chk )

Note: If using another DOD-approved anti-spam product for email or a DOD-approved Email Gateway spamming device, such as Enterprise Email Security Gateway (EEMSG), this is not applicable.

Note: If system is on SIPRNet, this is not applicable.

Review the Email Domain Security Plan (EDSP).

Determine the name of the Transport Agent.

Open the Windows PowerShell console and enter the following command:

Get-TransportAgent -Name 'customAgent' | Format-List

If the value does not return "customAgent", this is a finding.

Note: "customAgent" is the name of the custom agent developed to render hyperlink email sources from non .mil domains as unclickable.

Fix Text (F-63255r942137_fix)
Update the EDSP to reflect the name of the Transport Agent. Contact the DISA Enterprise Email Service Desk at disa.tinker.eis.mbx.dod-enterprise-services-service-desk@mail.mil and request the Agent and installation procedures. or Contact DEE Engineering PMO and request the Agent and installation procedures.