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

Exchange message size restrictions must be controlled on Send connectors.

DISA Rule

SV-259602r961155_rule

Vulnerability Number

V-259602

Group Title

SRG-APP-000247

Rule Version

EX19-ED-000115

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Update the EDSP to reflect the maximum message send size.

Open the Exchange Management Shell and enter the following command:

Set-SendConnector -Identity <'IdentityName'> -MaxMessageSize <MaxSendSize>

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

or

The value as identified by the EDSP that has obtained a signoff with risk acceptance.

Repeat the procedure for each send connector.

Check Contents

Review the Email Domain Security Plan (EDSP).

Determine the maximum message send size.

Open the Exchange Management Shell and enter the following command:

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

For each send connector, if the value of "MaxMessageSize" is not the same as the global value, this is a finding.

or

If "MaxMessageSize" is set to a numeric value different from the maximum message send size value documented in the EDSP, this is a finding.

Vulnerability Number

V-259602

Documentable

False

Rule Version

EX19-ED-000115

Severity Override Guidance

Review the Email Domain Security Plan (EDSP).

Determine the maximum message send size.

Open the Exchange Management Shell and enter the following command:

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

For each send connector, if the value of "MaxMessageSize" is not the same as the global value, this is a finding.

or

If "MaxMessageSize" is set to a numeric value different from the maximum message send size value documented in the EDSP, this is a finding.

Check Content Reference

M

Target Key

5579