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tname||cname,0,null from col--' USER_PWPW..... USER_PWUNAME..... There we go, we know the column names. Now that we know the table names and the column names of tables in that schema, we can change the NLS_DATE_FORMAT one more time to query that table not the dictionary tables. So the malicious user can next do the following: scott%ORA11GR2> alter session set 2 nls_date_format = '"''union select uname,0,null from user_pw--"'; Session altered. scott%ORA11GR2> exec ops$tkyte.inj( sysdate ) select * from all_users where created = ''union select uname,0,null from user_pw--' TKYTE..... PL/SQL procedure successfully completed. scott%ORA11GR2> alter session set 2 nls_date_format = '"''union select pw,0,null from user_pw--"'; Session altered. scott%ORA11GR2> exec ops$tkyte.inj( sysdate ) select * from all_users where created = ''union select pw,0,null from user_pw--' TOP SECRET..... PL/SQL procedure successfully completed. And there we go that evil developer/user now has your sensitive username and password information. How could you have protected yourself By using bind variables. For example: ops$tkyte%ORA11GR2> create or replace procedure NOT_inj( p_date in date ) 2 as 3 l_rec all_users%rowtype; 4 c sys_refcursor; 5 l_query long; 6 begin 7 l_query := ' 8 select * 9 from all_users 10 where created = :x'; 11 12 dbms_output.put_line( l_query ); 13 open c for l_query USING P_DATE; 14 15 for i in 1 .. 5

while stmt.step() print stmt.column('name') c1.exec('update episodes set <some columns, criteria, etc.>) end stmt.finalize() c1.exec('commit') c1.close() In cases like this, you should use statements from a single connection for reading or writing. Then you won t have to worry about database locks causing problems. However, as it turns out, this particular example still won t work. If you are iterating over a table with one statement and updating it with another, there is an additional locking issue that you need to know about as well, which we ll cover next.

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loop fetch c into l_rec; exit when c%notfound; dbms_output.put_line( l_rec.username || '.....' ); end loop; close c; end; /

Note You can t create formulas that refer to the pivot table totals or subtotals. Also, the calculated item

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Procedure created ops$tkyte%ORA11GR2> ops$tkyte%ORA11GR2> exec NOT_inj(sysdate) select * from all_users where created = :x PL/SQL procedure successfully completed It is a plain and simple fact that if you use bind variables you can t be subject to SQL injection If you do not use bind variables, you have to meticulously inspect every single line of code and think like an evil genius (one who knows everything about Oracle, every single thing) and see if there is a way to attack that code I don t know about you, but if I could be sure that 999999 percent of my code was not subject to SQL injection and only had to worry about the remaining 0.

A common gotcha in processing select statements is the failure to realize that the SHARED lock is not necessarily released until finalize() (or reset()) is called well, most of the time. Consider the following example: stmt = c1.prepare('select * from episodes') while stmt.step() print stmt.column('name') end c2.exec('begin immediate; update episodes set ; commit;') stmt.finalize() Although you should never do this in practice, you might end up doing it anyway by accident simply because you can get away with it. If you write the equivalent of this program in the C API, it will actually work. Even though finalize() has not been called, the second connection can modify the database without any problem. Before we tell you why, take a look at the next example: c1 = open('foods.db') c2 = open('foods.db') stmt = c1.prepare('select * from episodes') stmt.step() stmt.step() stmt.step() c2.exec('begin immediate; update episodes set ; commit;') stmt.finalize()

0001 percent (that couldn t use a bind variable for whatever reason), I d sleep much better at night than if I had to worry about 100 percent of my code being subject to SQL injection In any case, on the particular project I began describing at the beginning of this section, rewriting the existing code to use bind variables was the only possible course of action The resulting code ran orders of magnitude faster and increased many times the number of simultaneous users that the system could support And the code was more secure the entire codebase did not need to be reviewed for SQL injection issues However, that security came at a high price in terms of time and effort, because my client had to code the system and then code it again.

It is not that using bind variables is hard, or errorprone, it s just that they did not use them initially and thus were forced to go back and revisit virtually all of the code and change it My client would not have paid this price if the developers had understood that it was vital to use bind variables in their application from day one..

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