Files executed through a mail aliases file must be group-owned by root, bin, sys, or system, and must reside within a directory group-owned by root, bin, sys, or system.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22440	GEN004410	SV-45852r1_rule		Medium

Description
If a file executed through a mail aliases file is not group-owned by root or a system group, it may be subject to unauthorized modification. Unauthorized modification of files executed through aliases may allow unauthorized users to attain root privileges.

STIG	Date
SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide	2018-09-19

Details

Check Text ( C-43150r1_chk )
Examine the contents of the /etc/aliases file. Procedure: # more /etc/aliases Examine the aliases file for any utilized directories or paths. # ls -lL Check the permissions for any paths referenced. If the group owner of any file is not root, bin, sys, or system, this is a finding.

Fix Text (F-39236r1_fix)
Change the group ownership of the file referenced from /etc/aliases. Procedure: # chgrp root