The SMTP service HELP command must not be enabled.

From VMware vRealize Operations Manager 6.x SLES Security Technical Implementation Guide

Associated with: CCI-000382

SV-99195r1_rule The SMTP service HELP command must not be enabled.

Vulnerability discussion

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.

Check content

Check the permissions of the sendmail helpfile: ls -al /usr/lib/sendmail.d/helpfile If the permissions are not "0000", this is a finding.

Fix text

Run the following command to disable the sendmail helpfile: # chmod 0000 /usr/lib/sendmail.d/helpfile

Pro Tips

Lavender hyperlinks in small type off to the right (of CSS class id, if you view the page source) point to globally unique URIs for each document and item. Copy the link location and paste anywhere you need to talk unambiguously about these things.

You can obtain data about documents and items in other formats. Simply provide an HTTP header Accept: text/turtle or Accept: application/rdf+xml.