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

From Red Hat Enterprise Linux 5 Security Technical Implementation Guide

Part of GEN004370

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-37473r2_rule The aliases file must be group-owned by root, sys, bin, or system.

Vulnerability discussion

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

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Fix text

Change the group-owner of the /etc/aliases file. Procedure: for sendmail: # chgrp root /etc/aliases # chgrp smmsp /etc/aliases.db The aliases.db file must be owned by the same system group as sendmail, which is smmsp by default. for postfix # chgrp root /etc/postfix/aliases # chgrp root /etc/postfix/aliases.db

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