Exchange software must be monitored for unauthorized changes.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-259701	EX19-MB-000197	SV-259701r942417_rule		Medium

Description
Monitoring software files for changes against a baseline on a regular basis may help detect the possible introduction of malicious code on a system.

STIG	Date
Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide	2024-01-10

Details

Check Text ( C-63440r942415_chk )

Review the Email Domain Security Plan (EDSP). Determine whether the site monitors system files (e.g., *.exe, *.bat, *.com, *.cmd, and *.dll) on servers for unauthorized changes against a baseline on a weekly basis. If software files are not monitored for unauthorized changes, this is a finding. Note: An approved and properly configured solution will contain both a list of baselines that includes all system file locations and a file comparison task that is scheduled to run at least weekly.

Fix Text (F-63348r942416_fix)

Update the EDSP to specify that the organization monitors system files on servers for unauthorized changes against a baseline on a weekly basis or verify that this information is documented by the organization. Monitor the software files (e.g., *.exe, *.bat, *.com, *.cmd, and *.dll) on Exchange servers for unauthorized changes against a baseline on a weekly basis. Note: This can be done with the use of various monitoring tools.