Get the Whitepaper called Bypassing Oracle DBMS_ASSERT (in certain situations). Originally written in July of 2008 but is just being released now.
You can download it from the following link: https://packetstormsecurity.com/files/download/80625/Bypassing-DBMS_ASSERT.pdf
Source: https://packetstormsecurity.com/files/80625/Bypassing-Oracle-DBMS_ASSERT.html