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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-38885r1_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
AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE 2018-09-18

Details

Check Text ( C-37886r1_chk )
Check to see 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-31926r1_fix)
To disable the SMTP HELP command create an empty Sendmail help file.

# > /etc/mail/help