Oracle 9iAS can provide access to the PL/SQL application OWA_UTIL that provides web access to some stored procedures. These procuedures, without authentication, can allow users to access sensitive information such as source code of applications, user credentials to other database servers and run arbitrary SQL queries on servers accessed by the application server.

Apply the appropiate patch listed in http://otn.oracle.com/deploy/security/pdf/ias_modplsql_alert.pdf which details how you can restrict unauthenticated access to procedures using the exclusion_list parameter in the PL/SQL gateway configuration file: /Apache/modplsql/cfg/wdbsvr.app. More information: http://www.kb.cert.org/vuls/id/307835 http://www.cert.org/advisories/CA-2002-08.html http://otn.oracle.co.kr/docs/oracle78/was3x/was301/cart/psutil.htm Also read: Hackproofing Oracle Application Server from NGSSoftware: available at http://www.nextgenss.com/papers/hpoas.pdf