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The SMTP service HELP command must not be enabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-12006 | GEN004540 | SV-37504r4_rule | 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 |
|---|---|
| Red Hat Enterprise Linux 5 Security Technical Implementation Guide | 2016-12-16 |
Details
| Check Text ( C-36162r2_chk ) |
|---|
| Check if Help is disabled. This rule is for "sendmail" only and not applicable to "Postfix". Procedure: # telnet localhost 25 > help If the help command returns any sendmail version information, this is a finding. If sendmail is not installed this check is not applicable. |
| Fix Text (F-31413r3_fix) |
|---|
| To disable the SMTP HELP command, clear the Sendmail help file. # echo -n > /etc/mail/helpfile |