Note that after the double line, a space is required, and after # the space is optional. The introduction is to add a query depending on the information we want to get.Ĭommenting allows us to cut off the final part of the query so that it does not break the syntax. When investigating an error, you need to determine which quotes and brackets are used and if so, which ones. The balance is that the number of opening and closing quotes and brackets must be the same so as not to cause a syntax error. Operation of SQL injectionĮach time with any application, wherever the SQL injection is used, the following three basic implementation rules are used:
#DB2 SQL INJECTION TOOL PASSWORD#
In the real situation, such an error can be used on a website to login under an administrator account, for which it is enough to know only the name, and the password becomes unnecessary.īesides authentication traversal, SQL injection is used to extract information from databases, call denial of service (DoS), exploit other vulnerabilities (like XSS), etc.
This is an example of SQL injection operation. And if the name matches, the string gets to the results regardless of the password entered. That is, now the table is searched only by name. In it, the logic of the program’s work laid down by the developers was broken. SELECT `name`, `status`, `books` FROM `members` WHERE name = 'Demo' Since a closing quote was left in the comment, it was also entered with a username, so as not to break the syntax or cause an error, the result was actually the following query to the database: Consequently, the part ‘ AND password = ‘111’ disappears from the expression. everything behind them is no longer counted. Two lines (–) – means a comment to the end of a line, i.e. SELECT ` name `, `status`, `books` FROM `members` WHERE name = 'Demo' - ' AND password ='111' Then the query to the database will look like: Suppose that the user has entered such a line instead of Demo: In this case, the application gets the values “Demo” and “111” from the user – for example, in the form of login to the site. In this case, the results will only come if both the username and password are exactly the same as those stored in the table. This query causes a table bypass, which results in a comparison with each row, and if the condition name = ‘Demo’ AND password = ‘111’ is true for any row, then it gets to the results. Select (SELECT) the `name`, `status`, `books` fields from (FROM) the `members` table where (WHERE) the value of the name field is equal to Demo (name = ‘Demo’) and (AND) the value of the password field is equal to 111 (password = ‘111’). The request is similar to natural language (English) and its meaning is quite easy to interpret: SELECT ` name `, `status`, `books` FROM `members` WHERE name = 'Demo' AND password = '111' But in fact, SQL injection can be subject to any program that uses different databases (not only MySQL/MariaDB).Īs an example, consider an application that addresses a database with the following query: Usually SQLi is found in web applications. What is SQL Injection? SQL Injection Tutorial.Extracting data from a table using an SQL injection.Getting a list of all databases on the server through SQL injection.Determine the number of columns in a table using ORDER BY.A practical example of simple SQL injection.The list of DBMS and the variants of errors they display.