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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-4384r2_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 |
|---|---|
| UNIX SRG | 2013-03-26 |
Details
| Check Text ( C-8267r2_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-4295r2_fix) |
|---|
| Ensure Sendmail or its equivalent has been configured to mask the version information. If necessary, change the O SmtpGreetingMessage line in the /etc/mail/sendmail.cf file as noted below. O SmtpGreetingMessage=$j Sendmail $v/$Z; $b Change it to: O SmtpGreetingMessage= Mail Server Ready ; $b |