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 |