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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-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 25
> 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.