The aliases file must be group-owned by root, sys, smmsp, or bin.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-22438	GEN004370	SV-37458r1_rule	ECLP-1	Medium

Description
If the alias file is not group-owned by root or a system group, an unauthorized user may modify the file to add aliases to run malicious code or redirect email.

STIG	Date
Solaris 10 X86 Security Technical Implementation Guide	2020-02-26

Details

Check Text ( C-36126r1_chk )
Find the alias files on the system. Procedure: # egrep '^O(A\| AliasFile)' /etc/mail/sendmail.cf If the "alias file" is an NIS or LDAP map, this check is not applicable. The default location is /etc/mail/aliases. Check the group ownership of the alias file and the hashed version of it used by sendmail. Procedure: # ls -lL /etc/mail/aliases /etc/mail/aliases.db If the file is not group-owned by root, sys, smmsp, or bin, this is a finding.

Check Text ( C-36126r1_chk )

Find the alias files on the system.

Procedure:
# egrep '^O(A| AliasFile)' /etc/mail/sendmail.cf

If the "alias file" is an NIS or LDAP map, this check is not applicable. The default location is /etc/mail/aliases.

Check the group ownership of the alias file and the hashed version of it used by sendmail.

Procedure:
# ls -lL /etc/mail/aliases /etc/mail/aliases.db

If the file is not group-owned by root, sys, smmsp, or bin, this is a finding.

Fix Text (F-34506r1_fix)
Change the group owner of the /etc/mail/aliases files. Procedure: # chgrp bin /etc/mail/aliases # chgrp smmsp /etc/mail/aliases.db