qr code generator with logo javascript select first_name,last_name,phone_number from employees where department_id = || X in Java

Encoder QR Code ISO/IEC18004 in Java select first_name,last_name,phone_number from employees where department_id = || X

select first_name,last_name,phone_number from employees where department_id = || X
QR Code 2d Barcode Generation In Java
Using Barcode creator for Java Control to generate, create Quick Response Code image in Java applications.
QR Decoder In Java
Using Barcode decoder for Java Control to read, scan read, scan image in Java applications.
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
Barcode Generation In Java
Using Barcode generator for Java Control to generate, create barcode image in Java applications.
Scanning Barcode In Java
Using Barcode scanner for Java Control to read, scan read, scan image in Java applications.
12:
Making QR Code 2d Barcode In C#
Using Barcode printer for .NET framework Control to generate, create QR Code image in .NET applications.
Generating Quick Response Code In VS .NET
Using Barcode generation for ASP.NET Control to generate, create QR Code ISO/IEC18004 image in ASP.NET applications.
Secure Coding Practices in APEX
Painting QR Code JIS X 0510 In .NET Framework
Using Barcode encoder for Visual Studio .NET Control to generate, create QR image in .NET applications.
Creating QR-Code In Visual Basic .NET
Using Barcode drawer for Visual Studio .NET Control to generate, create Quick Response Code image in .NET framework applications.
Example 1: The Wrong Way
Generating GS1 DataBar Stacked In Java
Using Barcode encoder for Java Control to generate, create GS1 DataBar image in Java applications.
Linear Maker In Java
Using Barcode creator for Java Control to generate, create Linear image in Java applications.
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
EAN-13 Creation In Java
Using Barcode generator for Java Control to generate, create EAN13 image in Java applications.
DataMatrix Maker In Java
Using Barcode generation for Java Control to generate, create Data Matrix image in Java applications.
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; /
Make USPS POSTal Numeric Encoding Technique Barcode In Java
Using Barcode maker for Java Control to generate, create Postnet image in Java applications.
Decode Barcode In Java
Using Barcode reader for Java Control to read, scan read, scan image in Java applications.
At first glance, this procedure seems valid, and it would probably run just fine in a production environment Let s take a look at the first two examples with this procedure They are semantically the same, though the second procedure uses the q quote mechanism
Code 39 Full ASCII Printer In Java
Using Barcode creator for Android Control to generate, create Code 3 of 9 image in Android applications.
Code 3/9 Drawer In None
Using Barcode creation for Microsoft Excel Control to generate, create Code 39 Full ASCII image in Excel applications.
hr@aos> set serveroutput on hr@aos> exec sql_injection('Grant'); Grant - 2600 Grant - 7000 2 Rows Returned hr@aos> exec sql_injection(q'!Grant!'); Grant - 2600 Grant - 7000 2 Rows Returned
Barcode Creator In VS .NET
Using Barcode drawer for VS .NET Control to generate, create bar code image in VS .NET applications.
Printing European Article Number 13 In VS .NET
Using Barcode generator for ASP.NET Control to generate, create European Article Number 13 image in ASP.NET applications.
As you can see, the procedure displays both employees with the last name Grant Now suppose we want to see all employees, even though the developer of this procedure never intended this functionality:
Scanning Code 39 Full ASCII In Visual Studio .NET
Using Barcode reader for .NET Control to read, scan read, scan image in .NET applications.
Print Code 3/9 In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create Code 3/9 image in ASP.NET applications.
hr@aos> exec sql_injection(q'!Grant' or 1 = 1 --!'); King - 24000
Part IV: Applied Security for Oracle APEX and Oracle Business Intelligence
Kochhar - 17000 De Haan - 17000 Hunold - 9000 Ernst - 6000 Austin - 4800 Pataballa - 4800 Gietz - 8300 107 Rows Returned
Now we can see all 107 rows! How did this happen 1 By including the single quote after Grant, the where predicate has the correct syntax 2 Adding or 1 = 1 essentially negates the where predicate and returns every row since 1 will always equal 1 3 The -- at the end of the statement is the comment operator in Oracle SQL, which comments out the trailing single quote that is in the original procedure Remember that we already closed the quote in step 1 The addition of this predicate completely changes the result set of the query Instead of simply passing different last names to the procedure, we are able to construct parameters that will modify the structure of the query The more an attacker knows about a system, the more effectively he can plan an attack In the next example, we will pass a more sophisticated parameter to the same procedure to start investigating the data dictionary views
hr@aos> exec sql_injection(q'!ZZZ' union select null,null, table_name last_name,null,null,null,null,null,null,null,null from user_tables --!'); COUNTRIES DEPARTMENTS EMPLOYEES JOBS JOB_HISTORY LOCATIONS REGIONS 7 Rows Returned
Here s the breakdown of this attack: 1 The first part of the parameter is ZZZ This simply returns no rows from the employees table and closes the first quote This was intentional since we already have all of the rows in the preceding example 2 Next, we union in our own query The syntax of a union operator is such that both queries need to have the same number and type of columns, so an attacker would need to keep adding null columns until he received a result 3 Once again, we comment out the trailing single quote since we already closed it in step 1 A variation on this attack might be to query the USER_TAB_COLUMNS table to find all the columns in the employees table We could then union in our own query of the employees table
12:
Copyright © OnBarcode.com . All rights reserved.