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 receive connectors.

DISA Rule

SV-259607r961155_rule

Vulnerability Number

V-259607

Group Title

SRG-APP-000247

Rule Version

EX19-ED-000120

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Update the EDSP to reflect the global maximum message receive size.

Open the Exchange Management Shell and enter the following command:

Set-ReceiveConnector -Identity <'IdentityName'> -MaxMessageSize <'MaxReceiveSize'>

Note: The <IdentityName> and <MaxReceiveSize> values must be in quotes.

or

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

Check Contents

Review the Email Domain Security Plan (EDSP).

Determine the global maximum message receive size.

Open the Exchange Management Shell and enter the following command:

Identify internet-facing connectors.

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

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 global value and has signoff and risk acceptance in the EDSP, this is not a finding.

Vulnerability Number

V-259607

Documentable

False

Rule Version

EX19-ED-000120

Severity Override Guidance

Review the Email Domain Security Plan (EDSP).

Determine the global maximum message receive size.

Open the Exchange Management Shell and enter the following command:

Identify internet-facing connectors.

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

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 global value and has signoff and risk acceptance in the EDSP, this is not a finding.

Check Content Reference

M

Target Key

5579