The SMTP service HELP command must not be enabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-12006 | GEN004540 | SV-12507r2_rule | ECSC-1 | Medium |
| Description |
|---|
| The HELP command should be disabled to mask version information. The version of the SMTP service software could be used by attackers to target vulnerabilities present in specific software versions. |
| STIG | Date |
|---|---|
| UNIX SRG | 2013-03-26 |
Details
| Check Text ( C-7970r2_chk ) |
|---|
| Check if Help is disabled in Sendmail. Procedure: # telnet > help If the help command returns any Sendmail version information, this is a finding. |
| Fix Text (F-11266r2_fix) |
|---|
| To disable the SMTP HELP command, remove or empty the Sendmail help file: /etc/mail/helpfile. |