Oracle Application Express (APEX) suffers from an excessive privileges issue in relation to the FLOWS database schema/user account.
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PeteFinnigan.com Limited advisory for Oracle January 2008 CPU - The Oracle Ultra-Search provides excessive privileges assigned to the WKSYS database schema/user account.
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Tanel Poder has found a way to get SYSDBA access to the Oracle database by utilizing a user who has the BECOME USER system privilege, execute privileges on KUPP$PROC.CHANGE_USER and CREATE SESSION.
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Black Hat Conference Presentation - How to Unwrap Oracle PL/SQL.
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Abuse problems exist for the DIRECTORY object in Oracle. Patches have been released for this issue.
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