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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-45863r2_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
SUSE Linux Enterprise Server v11 for System z 2016-12-20

Details

Check Text ( C-43159r1_chk )
Check if the sendmail package is installed:
# rpm –q sendmail

If sendmail is not installed, this check is not applicable.
Check if Help is disabled. This rule is for “sendmail” only and not applicable to “Postfix”.

Procedure:
# telnet 25
> help

If the help command returns any sendmail version information, this is a finding.
Fix Text (F-39244r3_fix)
To disable the SMTP HELP command, remove, rename or empty the /usr/lib/sendmail.d.helpfile file.

# echo > /usr/lib/sendmail.d/helpfile