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-215412 | AIX7-00-003114 | SV-215412r991589_rule | CCI-000366 | 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 | 2024-08-16 | |||
Details
Check Text (C-215412r991589_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-16608r294688_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