The alias file must not have an extended ACL.

From SOLARIS 10 SPARC SECURITY TECHNICAL IMPLEMENTATION GUIDE

Associated with IA controls: ECLP-1

Associated with: CCI-000225

SV-26687r1_rule The alias file must not have an extended ACL.

Vulnerability discussion

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.

Check content

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 permissions include a "+", the file has an extended ACL and this is a finding.

Fix text

Remove the extended ACL from the files. # chmod A- /etc/mail/aliases /etc/mail/aliases.db

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