If sendmail is not required on AIX, the sendmail service must be disabled.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-215353	AIX7-00-003047	SV-215353r958478_rule		Medium

Description

The sendmail service has many historical vulnerabilities and, where possible, should be disabled. If the system is not required to operate as a mail server i.e. sending, receiving or processing e-mail, disable the sendmail daemon.

STIG	Date
IBM AIX 7.x Security Technical Implementation Guide	2024-08-16

Details

Check Text (C-16551r294510_chk)

From the command prompt, execute the following command:
# grep "^start[[:blank:]]/usr/lib/sendmail" /etc/rc.tcpip

If the above command produces any output, this is a finding.

Fix Text (F-16549r294511_fix)

In "/etc/rc.tcpip", comment out the "sendmail" entry by running command:
# chrctcp -d sendmail