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The Exchange email application must not share a partition with another application.


Finding ID Version Rule ID IA Controls Severity
V-259704 EX19-MB-000229 SV-259704r942426_rule Medium
In the same way that added security layers can provide a cumulative positive effect on security posture, multiple applications can provide a cumulative negative effect. A vulnerability and subsequent exploit to one application can lead to an exploit of other applications sharing the same security context. For example, an exploit to a web server process that leads to unauthorized administrative access to the host system can most likely lead to a compromise of all applications hosted by the same system. Email services should be installed on a partition that does not host other applications. Email services should never be installed on a Domain Controller/Directory Services server.
Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide 2024-01-10


Check Text ( C-63443r942424_chk )
Review the Email Domain Security Plan (EDSP).

Determine if the directory Exchange is installed:

1. Open Windows Explorer.
2. Navigate to where Exchange is installed.

If Exchange resides on a directory or partition other than that of the operating system and does not have other applications installed (unless approved by the Information System Security Officer [ISSO]), this is not a finding.
Fix Text (F-63351r942425_fix)
Update the EDSP with the location of where Exchange is installed.

Install Exchange on a dedicated application directory or partition separate than that of the operating system.