The SMTP service HELP command must not be enabled on AIX.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-215417 | AIX7-00-003122 | SV-215417r991589_rule | CCI-000366 | 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 | |||
| IBM AIX 7.x Security Technical Implementation Guide | 2024-08-16 | |||
Details
Check Text (C-215417r991589_chk)
Run the following command to get the "HELP" file location:
# grep "^O HelpFile" /etc/mail/sendmail.cf
The above command should yield the following output:
O HelpFile=/etc/mail/helpfile
If the above command does not yield any output, this is not a finding.
The "HELP" file should be referenced by the "HelpFile" option.
Check to see if the "HELP" file exists:
# ls <helpfile_path>
If the "HELP" file exists, this is a finding.
Fix Text (F-16613r294703_fix)
To disable the SMTP service HELP command remove the HELP file using command:
# rm <helpfile_path>