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The only thing that changes between page views is the value of X in the predicate The developer of this application expects that only the value for DEPARTMENT_ID will ever be a number However, a hacker might have very different plans for this predicate, such as returning all rows, or perhaps returning metadata about the database schema to plan an attack The key to preventing SQL injection attacks is the use of bind variables If the structure or semantics of a query can change at runtime, then it is potentially vulnerable to SQL injection Most of the time, the vulnerability is introduced by concatenating variables within the body of the query The example in the preceding paragraph shows the variable X concatenated with the rest of the query The query cannot be parsed before this concatenation occurs, and therefore the concatenation can change the structure of the query every time it is run For our purposes, we can simplify the Oracle SQL parser a bit and assume that it goes through three phases to run a SQL query: parse, bind, and execute In the parse phase, the SQL parser checks that the query is syntactically valid and that all the objects that it references are valid, and then it locks in the structure of the query During the bind phase, the actual values of bind variables are substituted for their placeholders in the query Again, the bind variables can change the value of the placeholder variables, but they cannot change the structure of the query since that was already established during the parse phase The final step is for the SQL parser to execute the query Queries that concatenate, not bind variables, essentially reverse the bind and parse phases The string is concatenated together, including the values of the variables, and then it is parsed This reversal of phases allows an attacker to change the semantics of a query completely at runtime.

Fig 6-1

12:

The McGraw Hill Companies, 2010

If x 2, the price for each stereo will be P 80 5 2 $70: A rental company manages an o ce complex with 16 o ces Each o ce can be rented if the monthly rent is $1000 For each $200 increase in the rent, one tenant will be lost Let x represent the number of $200 increases in the rent P 1000 200x Q 16 1x R 1000 200x 16 x What should the monthly rent be if the rental company needs $20,800 each month in revenue R 1000 200x 16 x 20;800 1000 200x 16 x 20;800 16;000 2200x 200x2 200x2 2200x 4800 0 1 1 200x2 2200x 4800 0 200 200 x2 11x 24 0 x 3 x 8 0 x 3 0 x 3 x 8 0 x 8

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3 Enter the ERASE command by picking the Erase button from the Modify panel on the Ribbon or by entering E at the keyboard The AutoCAD prompt changes to Select objects Notice that the crosshairs have changed to a small box called the pickbox The pickbox is used to pick objects At this point, you can also create a window to select points 4 Pick a point anywhere to the lower left of the triangle 5 Move the pointing device to the right and notice that a blue box forms This box de nes the selection window 6 Move the pointing device so that the triangle ts completely inside the window and pick a point The objects to be erased are highlighted with broken lines, as shown in Fig 6-2 The highlighted objects make up the selection set

To help you better understand the concept of SQL injection, let s construct a procedure that is vulnerable to SQL injection The following procedure takes in a parameter of p_last_name, then outputs all employees that match the parameter (Note that I am using the Q quote mechanism introduced in Oracle Database 10g R2 to make the examples easier to read) The key is that the string is enclosed in the following syntax: q ! some string! This allows strings to contain single quotes without the need to escape those single quotes

Fig 6-2

If x 3, the monthly rent will be 1000 200 3 $1600 If x 8, the monthly rent will be 1000 200 8 $2600 A grocery store sells 300 pounds of bananas each day when they are priced at 45 cents per pound The produce manager observes that for each 5-cent decrease in the price per pound of bananas, an additional 50 pounds are sold Let x represent the number of 5-cent decreases in the price P 45 5x Q 300 50x R 45 5x 300 5x What should the price of bananas be for weekly sales to be $140 How many bananas (in pounds) will be sold at this price (these prices) (The revenue will be in terms of cents, so $140 becomes 14,000 cents)

create or replace procedure sql_injection( 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 = '!'||p_last_name||q'!'!'; execute immediate x bulk collect into emp_rec; 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; /

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