The SMTP services SMTP greeting must not provide version information.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-239538 | VROM-SL-000595 | SV-239538r662065_rule | Medium |
| 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 |
|---|---|
| VMware vRealize Operations Manager 6.x SLES Security Technical Implementation Guide | 2021-07-01 |
Details
| Check Text ( C-42771r662063_chk ) |
|---|
| To check for the sendmail version being displayed in the greeting: # more /etc/sendmail.cf | grep SmtpGreetingMessage If it returns: O SmtpGreetingMessage=$j Sendmail $v/$Z; $b Then sendmail is providing version information, this is a finding. |
| Fix Text (F-42730r662064_fix) |
|---|
| Change the "O SmtpGreetingMessage" line in the "/etc/sendmail.cf" file to: O SmtpGreetingMessage= Mail Server Ready ; $b |