The DBMS_Scheduler in Oracle 10g allows remote attackers with CREATE JOB privileges to gain additional privileges by changing SESSION_USER to the SYS user.
https://exchange.xforce.ibmcloud.com/vulnerabilities/20410
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-1499
http://www.securityfocus.com/bid/13509
http://www.red-database-security.com/exploits/oracle_exploit_dbms_scheduler_select_user.html