Oracle 9i Application Server (9iAS) installs multiple sample pages that allow remote attackers to obtain environment variables and other sensitive information via (1) info.jsp, (2) printenv, (3) echo, or (4) echo2.
https://exchange.xforce.ibmcloud.com/vulnerabilities/8665
http://www.securityfocus.com/bid/6556
http://www.oracle.com/technology/deploy/security/pdf/ias_modplsql_alert.pdf
http://www.nextgenss.com/papers/hpoas.pdf