PL/SQL module 3.0.9.8.2 in Oracle 9i Application Server 1.0.2.x allows remote attackers to obtain sensitive information via the OWA_UTIL stored procedures (1) OWA_UTIL.signature, (2) OWA_UTIL.listprint, or (3) OWA_UTIL.show_query_columns.
http://www.securityfocus.com/bid/4294
http://www.nextgenss.com/papers/hpoas.pdf
http://www.kb.cert.org/vuls/id/307835
http://www.cert.org/advisories/CA-2002-08.html
http://otn.oracle.com/deploy/security/pdf/ias_modplsql_alert.pdf