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The SMTP service's SMTP greeting must not provide version information.


Overview

Finding ID Version Rule ID IA Controls Severity
V-4384 GEN004560 SV-39164r1_rule ECSC-1 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
Draft AIX Security Technical Implementation Guide 2011-08-17

Details

Check Text ( C-38146r1_chk )
Check for the Sendmail version being displayed in the greeting:
# telnet localhost 25
If a version number is displayed, this is a finding.
Fix Text (F-33419r1_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.

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

Change it to:

O SmtpGreetingMessage= Mail Server Ready ; $b