STIGQter: STIG Summary: Microsoft Exchange 2016 Mailbox Server Security Technical Implementation Guide Version: 2 Release: 3 Benchmark Date: 23 Apr 2021:

The Exchange SMTP automated banner response must not reveal server details.

DISA Rule

SV-228408r612748_rule

Vulnerability Number

V-228408

Group Title

SRG-APP-000435

Rule Version

EX16-MB-000650

Severity

CAT II

CCI(s)

• CCI-002385 - The information system protects against or limits the effects of organization-defined types of denial of service attacks by employing organization-defined security safeguards.

Weight

10

Fix Recommendation

Open the Exchange Management Shell and enter the following command:

Set-ReceiveConnector -Identity <'IdentityName'> -Banner '220 SMTP Server Ready'

Note: The <IdentityName> and 220 SMTP Server Ready values must be in single quotes.

Repeat the procedures for each Receive connector.

Check Contents

Open the Exchange Management Shell and enter the following command:

Get-ReceiveConnector | Select Name, Identity, Banner

For each Receive connector, if the value of "Banner" is not set to "220 SMTP Server Ready", this is a finding.

Vulnerability Number

V-228408

Documentable

False

Rule Version

EX16-MB-000650

Severity Override Guidance

Open the Exchange Management Shell and enter the following command:

Get-ReceiveConnector | Select Name, Identity, Banner

For each Receive connector, if the value of "Banner" is not set to "220 SMTP Server Ready", this is a finding.

Check Content Reference

M

Target Key

4223

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