STIGQter: STIG Summary: Microsoft Exchange 2016 Edge Transport Server Security Technical Implementation Guide Version: 2 Release: 6 Benchmark Date: 30 Jan 2025:

Exchange messages with a malformed From address must be rejected.

DISA Rule

SV-221242r1040907_rule

Vulnerability Number

V-221242

Group Title

SRG-APP-000261

Rule Version

EX16-ED-000430

Severity

CAT II

CCI(s)

• CCI-001308 - Automatically update spam protection mechanisms on an organization-defined frequency.

Weight

10

Fix Recommendation

Open the Exchange Management Shell and enter the following command:

Set-SenderIdConfig -SpoofedDomainAction Reject

Check Contents

If this server is in a SIPR Enclave, this requirement is Not Applicable.

Note: If third-party anti-spam product is being used, the anti-spam product must be configured to meet the requirement.

Open the Exchange Management Shell and enter the following command:

Get-SenderIdConfig | Select Name, Identity, SpoofedDomainAction

If the value of "SpoofedDomainAction" is not set to "Reject", this is a finding.

Vulnerability Number

V-221242

Documentable

False

Rule Version

EX16-ED-000430

Severity Override Guidance

If this server is in a SIPR Enclave, this requirement is Not Applicable.

Note: If third-party anti-spam product is being used, the anti-spam product must be configured to meet the requirement.

Open the Exchange Management Shell and enter the following command:

Get-SenderIdConfig | Select Name, Identity, SpoofedDomainAction

If the value of "SpoofedDomainAction" is not set to "Reject", this is a finding.

Check Content Reference

M

Target Key

4079