STIGQter: STIG Summary: Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 22 Jan 2021:

Exchange must have accepted domains configured.

DISA Rule

SV-221204r612603_rule

Vulnerability Number

V-221204

Group Title

SRG-APP-000038

Rule Version

EX16-ED-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

Update the EDSP.

Open the Exchange Management Shell and enter the following command:

Set-AcceptedDomain -Identity <'IdentityName'> -MakeDefault $true

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

Check Contents

Review the Email Domain Security Plan (EDSP).

Determine the Accepted Domain values.

Open the Exchange Management Shell and enter the following command:

Get-AcceptedDomain | Select Name, DomainName, Identity, Default

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

or

If the "Default" value for "AcceptedDomains" is set to another value other than "True" and has signoff and risk acceptance in the EDSP, this is not a finding.

Vulnerability Number

V-221204

Documentable

False

Rule Version

EX16-ED-000030

Severity Override Guidance

Review the Email Domain Security Plan (EDSP).

Determine the Accepted Domain values.

Open the Exchange Management Shell and enter the following command:

Get-AcceptedDomain | Select Name, DomainName, Identity, Default

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

or

If the "Default" value for "AcceptedDomains" is set to another value other than "True" and has signoff and risk acceptance in the EDSP, this is not a finding.

Check Content Reference

M

Target Key

4079

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