STIGQter: STIG Summary: Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide Version: 2 Release: 2 Benchmark Date: 30 Jan 2025:

Exchange internal Send connectors must require encryption.

DISA Rule

SV-259642r961632_rule

Vulnerability Number

V-259642

Group Title

SRG-APP-000439

Rule Version

EX19-ED-000236

Severity

CAT I

CCI(s)

• CCI-002418 - Protect the confidentiality and/or integrity of transmitted information.

Weight

10

Fix Recommendation

If using "DomainValidation", open the Exchange Management Shell and enter the following command:

Set-SendConnector -Identity <'Identity'> -TlsDomain <InternalSMTPDomain> -TlsAuthLevel DomainValidation -RequireTLS $true

If using "DomainSecureEnabled", open the Exchange Management Shell and enter the following command:

Set-SendConnector -Identity <'ReceiveConnector'> -DomainSecureEnabled $true

Note:
- To use DomainSecureEnabled, DNSRouting must be set to $true.
- The same domain must also be defined on the corresponding Receive connector and in the TLSReceiveDomainSecureList attribute of the transport configuration.

Check Contents

Check the Email Domain Security Plan (EDSP) and determine which send connector is using which secure validation method. If no configuration setting is found, this is a finding.

If using "DomainValidation", open the Exchange Management Shell and enter the following command:

Get-SendConnector | Select-Object -Property Name, Identity, TlsDomain

If the value of "TlsDomain" is not set to the value of the internal <'SMTP Domain'>, this is a finding.

If using "DomainSecureEnabled", open the Exchange Management Shell and enter the following command:

Get-SendConnector | Select-Object -Property Name, Identity, DomainSecureEnabled

If the value of 'DomainSecureEnabled' is not set to 'True', this is a finding.

Note: The wildcard character (*) is not supported in domains that are configured for mutual TLS authentication. The same domain must also be defined on the corresponding Receive connector and in the TLSReceiveDomainSecureList attribute of the transport configuration.

Vulnerability Number

V-259642

Documentable

False

Rule Version

EX19-ED-000236

Severity Override Guidance

Check the Email Domain Security Plan (EDSP) and determine which send connector is using which secure validation method. If no configuration setting is found, this is a finding.

If using "DomainValidation", open the Exchange Management Shell and enter the following command:

Get-SendConnector | Select-Object -Property Name, Identity, TlsDomain

If the value of "TlsDomain" is not set to the value of the internal <'SMTP Domain'>, this is a finding.

If using "DomainSecureEnabled", open the Exchange Management Shell and enter the following command:

Get-SendConnector | Select-Object -Property Name, Identity, DomainSecureEnabled

If the value of 'DomainSecureEnabled' is not set to 'True', this is a finding.

Note: The wildcard character (*) is not supported in domains that are configured for mutual TLS authentication. The same domain must also be defined on the corresponding Receive connector and in the TLSReceiveDomainSecureList attribute of the transport configuration.

Check Content Reference

M

Target Key

5579