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The SMTP service SMTP greeting must not provide version information.


Finding ID Version Rule ID IA Controls Severity
V-89665 VRAU-SL-000615 SV-100315r1_rule Medium
The version of the SMTP service can be used by attackers to plan an attack based on vulnerabilities present in the specific version.
VMware vRealize Automation 7.x SLES Security Technical Implementation Guide 2018-10-12


Check Text ( C-89357r1_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-96407r1_fix)
Change the "O SmtpGreetingMessage" line in the /etc/sendmail.cf file to:

O SmtpGreetingMessage= Mail Server Ready ; $b