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

From SUSE Linux Enterprise Server v11 for System z

Associated with: CCI-000225

SV-45848r2_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.

Check content

If the “sendmail” or “postfix” packages are not installed, this is not applicable. Check the group ownership of the alias files. Procedure: for sendmail: # ls -lL /etc/aliases If the file is not group-owned by root, this is a finding. # ls -lL /etc/aliases.db If the file is not group-owned by root, this is a finding. for postfix: Verify the location of the alias file. # postconf alias_maps This will return the location of the "aliases" file, by default "/etc/aliases". # ls -lL If the file is not group-owned by root, this is a finding. # ls -lL If the file is not group-owned by root, this is a finding.

Fix text

Change the group-owner of the /etc/aliases file. Procedure: for sendmail: # chgrp root /etc/aliases # chgrp root /etc/aliases.db for postfix # chgrp root # chgrp root

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