Exchange software must be installed on a separate partition from the OS.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-69771	EX13-CA-000140	SV-84393r1_rule		Medium

Description
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.

Description

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.

STIG	Date
MS Exchange 2013 Client Access Server Security Technical Implementation Guide	2019-12-18

Details

Check Text ( C-70221r1_chk )
Review the Email Domain Security Plan (EDSP). Determine where the directory Exchange is installed. Open Windows Explorer. Navigate to the directory or partition where Exchange is installed. If Exchange resides on a directory or partition other than that of the OS and does not have other applications installed (unless approved by the ISSO), this is not a finding.

Fix Text (F-75983r1_fix)
Update the EDSP. Install Exchange on a dedicated application directory or partition separate than that of the OS.