Every software runs on the code designed by its developer. An SQL injection attack is a threat, which is executed by hackers, wherein they send destructive SQL codes to the system. These codes have the ability to control the database server of a web application system. The attack can be so powerful that it can destroy any website or an application that uses the SQL coding. The SQL injection attack has been prevalent in the cyber world for a long time, and is considered as the most destructive way to spoil a web application.
The SQL injection technique is utilized as a means to counteract the authentication method of a web application. The coding can make the web application surpass the authorization procedure, which can lead to the free access to the database, thereby causing harm. The attackers after receiving access to the database tend to modify, add and delete entries of the database causing severe data probity issues. The main motive behind the attack is to get free access of sensitive data which includes company details, customer information, trade secrets, and other sensitive particulars which, when leaked, can lead to huge losses.
SQL Queries and Injection
SQL is a programming language that is used to build a database or make changes to it based on the choice of its user. The queries of SQL are meant to run commands pertaining to data recovery, data updating and data deletion. A typical example for getting a table name details include:
The use of (*) is meant to rebound the items off the table. In this case the attacker would try to include its own input in order to make changes to the database which can harm the system. For e.g.
Insert into users (username.userid)values(“HackerJim, “.”hj123”);
The intention of the hackers is not restricted to the point of obtaining information. They intend to make changes to the login information or make changes in web pages or even want the server to be completely closed down.
Defense Mechanisms to Combat Attacks
The SQL injection attack can be prevented by using Checkmarx, which is an exclusive source code analysis result used for the identification, repair, and tracking of any technical and logical problems in the origin code. The other prevention methods include the usage of parameterized queries also known as prepared statements. These statements, ask the software developers to describe all codes of SQL, and then allow its query testing, which will help in identifying and authorizing the correct database. The use of stored method is also common where a stored procedure is mentioned and fixed in the database, and the application is checked from there rather than any inputs from the user.
The database management system backs the character’s escape route related to certain types of queries. When the escape plan is fixed in accordance with this escape route, the system will not mess up it up with the developers input, thereby reducing the chances of a possible attack. The prevention is also exercised by restricting the privileges guaranteed to each database account. The use of the input validation mechanism is beneficial too, as it restricts unauthorized entries.