Title

The SMTP service HELP command must not be enabled. (Cat II impact)

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 if Help is disabled in Sendmail. Procedure: # grep HelpFile /etc/sendmail.cf If the contents of the file indicated by the HelpFile parameter contains any Sendmail version information, this is a finding.

Fix Text

To disable the SMTP HELP command, clear the Sendmail help file.

Additional Identifiers

Rule ID:

Vulnerability ID: V-12006

Group Title:

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.