The alias file must not have an extended ACL.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22439	GEN004390	SV-38809r1_rule	ECLP-1	Medium

Description
Excessive permissions on the aliases file may permit unauthorized modification. If the alias file is modified by an unauthorized user, they may modify the file to run malicious code or redirect e-mail.

STIG	Date
AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2018-09-18

Details

Check Text ( C-36882r1_chk )
Check the permissions of the /etc/mail/aliases file. #aclget /etc/mail/aliases Check if extended permissions are disabled. If extended permissions are not disabled, this is a finding.

Fix Text (F-31896r1_fix)
Remove the extended ACL from the alias file and disable extended permissions. #acledit /etc/mail/aliases