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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-220098	GEN004370	SV-220098r603266_rule		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	2020-12-04

Details

Check Text ( C-21807r489886_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-21807r489886_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-21806r489887_fix)
Change the group owner of the /etc/mail/aliases files. Procedure: # chgrp bin /etc/mail/aliases # chgrp smmsp /etc/mail/aliases.db