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I have been using CodeIgniter for two years and I am digging into penetration testing. I think that ActiveRecord does good job at preventing SQL injections, but is there any possibility of bypassing ActiveRecord's filter system by ASCII Encoded / Binary String SQL injection?

If it is possible, then how can I prevent ASCII Encoded / Binary String SQL injection?

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The question in your title is not the same as your first question in the body since prevention is not the same as knowing if there is actually a vulnerability. I'm not familiar with CodeIgniter, but you might check the source code to see if it uses prepared statements. –  HamZa Nov 8 '13 at 18:57

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