STIGQter: STIG Summary: Microsoft Exchange 2016 Mailbox Server Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

Exchange auto-forwarding email to remote domains must be disabled or restricted.

DISA Rule

SV-228356r612748_rule

Vulnerability Number

V-228356

Group Title

SRG-APP-000038

Rule Version

EX16-MB-000030

Severity

CAT II

CCI(s)

• CCI-001368 - The information system enforces approved authorizations for controlling the flow of information within the system based on organization-defined information flow control policies.

Weight

10

Fix Recommendation

Non-Enterprise Mail Fix Text:

Open the Exchange Management Shell and enter the following command:

Set-RemoteDomain -Identity <'IdentityName'> -AutoForwardEnabled $false

Note: The <IdentityName> value must be in single quotes.

Enterprise Mail Fix Text:

New-RemoteDomain -Name <NewRemoteDomainName> -DomainName <SMTP Address>

Note: <NewRemoteDomainName> must either be a .mil or .gov domain.

Set-RemoteDomain -Identity <'RemoteDomainIdentity'> -AutoForwardEnabled $true

Note: The <RemoteDomainIdentity> value must be in single quotes.

Check Contents

Note: Requirement is not applicable on classified or completely closed networks.

Non-Enterprise Mail Check Content:

Open the Exchange Management Shell and enter the following command:

Get-RemoteDomain | Select Identity, AutoForwardEnabled

If the value of AutoForwardEnabled is not set to "False", this is a finding.

Enterprise Mail Check Content:

If the value of "AutoForwardEnabled" is set to "True", this is not a finding.

and

In the Exchange Management Shell, enter the following command:

Get-RemoteDomain

If the value of "RemoteDomain" is not set to ".mil" and/or ".gov" domain(s), this is a finding.

Vulnerability Number

V-228356

Documentable

False

Rule Version

EX16-MB-000030

Severity Override Guidance

Note: Requirement is not applicable on classified or completely closed networks.

Non-Enterprise Mail Check Content:

Open the Exchange Management Shell and enter the following command:

Get-RemoteDomain | Select Identity, AutoForwardEnabled

If the value of AutoForwardEnabled is not set to "False", this is a finding.

Enterprise Mail Check Content:

If the value of "AutoForwardEnabled" is set to "True", this is not a finding.

and

In the Exchange Management Shell, enter the following command:

Get-RemoteDomain

If the value of "RemoteDomain" is not set to ".mil" and/or ".gov" domain(s), this is a finding.

Check Content Reference

M

Target Key

4223

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