If the AIX host is running an SMTP service, the SMTP greeting must not provide version information.
An XCCDF Rule
Description
The version of the SMTP service can be used by attackers to plan an attack based on vulnerabilities present in the specific version.
- ID
- SV-215412r991589_rule
- Version
- AIX7-00-003114
- Severity
- Low
- References
- Updated
Remediation Templates
A Manual Procedure
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