← Back to IBM AIX 7.x Security Technical Implementation Guide

V-215412

CAT III (Low)

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

Rule ID

SV-215412r991589_rule

STIG

IBM AIX 7.x Security Technical Implementation Guide

Version

V3R2

CCIs

CCI-000366

Discussion

The version of the SMTP service can be used by attackers to plan an attack based on vulnerabilities present in the specific version.

Check Content

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

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