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The fatal flaw with the procedure in the preceding example is that instead of using bind variables, it glues a query together based on values passed in by the user, allowing an attacker to change the structure and the semantics of the query Bind variables prevent SQL injection by allowing the values of predicates to change at runtime, yet the structure of the query cannot change The following example is a modified version of the preceding example implemented using bind variables:

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create or replace procedure sql_injection_prevented( p_last_name in varchar2) is type employee_record is table of employees%ROWTYPE; emp_rec employee_record := employee_record(); x varchar2(32767); begin x := q'!select * from employees where last_name = :last_name !'; execute immediate x bulk collect into emp_rec using p_last_name; for i in emp_recfirstemp_reclast loop dbms_outputput(emp_rec(i)last_name||' - '); dbms_outputput_line(emp_rec(i)salary); end loop; dbms_outputput_line(emp_reccount||' Rows Returned'); end sql_injection_prevented; /

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4x2 32x 55 0 2x 5 2x 11 0 2x 5 0 2x 5 5 x 2 x 2:5 2x 11 0 2x 11 11 x 2 x 5:5

The McGraw Hill Companies, 2010

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Take a close look at the query string defined in the variable X Because it uses a bind variable, :last_name, the query is first parsed without the actual value of p_last_name substituted for the bind variable last_name The SQL parser knows during the parse phase that this query has only one predicate and that the only acceptable value for last_name is a character string that represents a value It is impossible to add any structures such as an OR predicate that changes structure of the query To prove this, let s use a few of the tests from our previous example This procedure works as expected when we call it with a last name:

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Now let s try one of our SQL injection techniques:

If x 2:50, the price should be 2:80 0:10 2:5 $2:55 If x 5:5, the price should be 2:80 0:10 5:50 $2:25 3 P 4 0:05x Q 500 20x R 4 0:05x 500 20x

Draw the hex ratchet Begin by creating the circles for the ends of the ratchet Then create the lines and polygon Use the BREAK command to remove parts of both circles as indicated to nish the drawing Use a drawing area of 280 215 Dimension the drawing in millimeters

hr@aos> exec sql_injection_prevented(q'!Grant' or 1 = 1--!'); BEGIN sql_injection_prevented(q'!Grant' or 1 = 1--!'); END; * ERROR at line 1:

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ORA-06502: PL/SQL: numeric or value error ORA-06512: at "HRSQL_INJECTION_PREVENTED", line 1 ORA-06512: at line 1

The mechanism below consists of three parts: a driver, a follower, and a link Use the dimensions shown and the CIRCLE, OFFSET, and FILLET commands to draw the front view

2450 4 0:05x 500 20x 2450 2000 55x x2 x2 55x 450 0 x 45 x 10 0 x 45 0 x 10 0 x 45 x 10 If x 45, the price should be 4 0:05 45 $1:75 and 500 20 45 1400 buckets would be sold If x 10, the price should be 4 0:05 10 $3:50 and 500 20 10 700 buckets would be sold 4 P 30 2x Q 40 5x R 30 2x 40 5x

This time we receive a numeric or value error since the string we passed in is not a valid string when searching for LAST_NAME Now that you fully understand the concept of SQL injection, let s talk about how it applies to APEX Bind variables are remarkably easy to use in APEX since you do not have to write extra code to bind the values of those variables You can simply reference the APEX items using bind variable syntax The following examples demonstrate a SQL query and an insert statement as a developer would use them in APEX:

The McGraw Hill Companies, 2010

-- This query is used in a report region select first_name,last_name from employees where instr(upper(last_name),upper(nvl(:P1_SEARCH,last_name))) > 0 -- This insert statement is used in a page process insert into employees (first_name,last_name) values (:P2_FIRST_NAME,:P2_LAST_NAME) returning employee_id into :P2_NEW_EMPLOYEE_ID;

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