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If the AIX host is running an SMTP service, the SMTP greeting must not provide version information.


Overview

Finding ID Version Rule ID IA Controls Severity
V-91653 AIX7-00-003114 SV-101751r1_rule Low
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
IBM AIX 7.x Security Technical Implementation Guide 2020-02-24

Details

Check Text ( C-90807r1_chk )
If the AIX host is not running an SMTP service, this is Not Applicable.

Check the value of the "SmtpGreetingMessage" parameter in the "sendmail.cf" file:
# grep SmtpGreetingMessage /etc/mail/sendmail.cf

If the value of the "SmtpGreetingMessage" parameter contains the "$v" or "$Z" macros, this is a finding.
Fix Text (F-97851r1_fix)
Ensure "Sendmail" or its equivalent has been configured to mask the version information. If necessary, change the "O SmtpGreetingMessage" line in the "/etc/sendmail.cf" file from:
O SmtpGreetingMessage=$j Sendmail $v/$Z; $b

to:

O SmtpGreetingMessage= Mail Server Ready ; $b