The alias file must be owned by root.

From AIX 6.1 SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-40836r1_rule The alias file must be owned by root.

Vulnerability discussion

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

Check content

Check the ownership of the alias file. Procedure: # ls -lL /etc/mail/aliases If the file is not owned by root, this is a finding.

Fix text

Change the owner of the /etc/mail/aliases file (or equivalent, such as /usr/lib/aliases) to root. Procedure: # chown root /etc/mail/aliases

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