The alias file must have mode 0644 or less permissive.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-832	GEN004380	SV-40651r1_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 email.

STIG	Date
SOLARIS 10 X86 SECURITY TECHNICAL IMPLEMENTATION GUIDE	2018-04-10

Details

Check Text ( C-39390r1_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 permissions 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 alias files have a mode more permissive than 0644, this is a finding.

Check Text ( C-39390r1_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 permissions 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 alias files have a mode more permissive than 0644, this is a finding.

Fix Text (F-34508r1_fix)
Change the mode of the /etc/mail/aliases files (or equivalent, such as /usr/lib/aliases) to 0644. Procedure: # chmod 0644 /etc/mail/aliases /etc/mail/aliases.db