Firebird 1.5 allows remote authenticated users without SYSDBA and owner permissions to overwrite a database by creating a database.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2006-7192
http://www.securityfocus.com/bid/28474
http://www.firebirdsql.org/rlsnotes/Firebird-2.0-ReleaseNotes.pdf