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The SMTP service SMTP greeting must not provide version information.


Overview

Finding ID Version Rule ID IA Controls Severity
V-240444 VRAU-SL-000615 SV-240444r671073_rule Medium
Description
The version of the SMTP service can be used by attackers to plan an attack based on vulnerabilities present in the specific version.
STIG Date
VMware vRealize Automation 7.x SLES Security Technical Implementation Guide 2021-06-24

Details

Check Text ( C-43677r671071_chk )
To check for the sendmail version being displayed in the greeting:

# more /etc/sendmail.cf | grep SmtpGreetingMessage

If it returns the following:

O SmtpGreetingMessage=$j Sendmail $v/$Z; $b

Then sendmail is providing version information, and this is a finding.
Fix Text (F-43636r671072_fix)
Change the "O SmtpGreetingMessage" line in the /etc/sendmail.cf file to:

O SmtpGreetingMessage= Mail Server Ready ; $b