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XCCDF
Microsoft Exchange 2019 Edge Server Security Technical Implementation Guide
SRG-APP-000435
The Exchange SMTP automated banner response must not reveal server details.
The Exchange SMTP automated banner response must not reveal server details.
An XCCDF Rule
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The Exchange SMTP automated banner response must not reveal server details.
Medium Severity
<VulnDiscussion>Automated connection responses occur as a result of FTP or Telnet connections when connecting to those services. They report a successful connection by greeting the connecting client and stating the name, release level, and (often) additional information about the responding product. While useful to the connecting client, connection responses can also be used by a third party to determine operating system or product release levels on the target server. The result can include disclosure of configuration information to third parties, paving the way for possible future attacks. For example, when querying the SMTP service on port 25, the default response looks similar to this one: 220 exchange.mydomain.org Microsoft ESMTP MAIL Service ready at Tuesday, 23 Nov 2021 13:43:00 -0500 Changing the response to hide local configuration details reduces the attack profile of the target.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>