What does sql injection mean?

This article mainly introduces what sql injection means. It has certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. The editor will take everyone to find out together.

Sql injection can generally be entered directly through a web form. SQL injection means that the web application does not judge the legality of the data input by the user or the filtering is not strict, and the attacker can add additional SQL statements to achieve illegal operations.

SQL injection means that the web application does not judge the legality of user input data or filter it laxly. Add additional SQL statements to implement illegal operations without the administrator’s knowledge, so as to deceive the database server into performing unauthorized arbitrary queries, and further obtain corresponding data information.

Features:

1. Extensive

Any database based on SQL language may be attacked. Normative validation and detection of values ​​received from input parameters, web forms, cookies, etc., often presents SQL injection vulnerabilities.

2. Concealment

SQL injection statements are generally embedded in ordinary HTTP requests, which are difficult to distinguish from normal statements, so many current firewalls cannot recognize and warn, and There are many variants of SQL injection, and attackers can adjust the parameters of the attack, so the effect of using traditional methods to defend against SQL injection is very unsatisfactory.

3. Great harm

The attacker obtains the database name, table name, and field name of the server through SQL injection, thereby obtaining the data in the entire server, and the data of website users There is a great threat to security. Attackers can also obtain the background administrator’s password through the obtained data, and then maliciously tamper with the web page. This not only poses a serious threat to the security of database information, but also has a major impact on the security of the entire database system.

4. Easy to operate

There are many SQL injection tools on the Internet, which are easy to learn, easy to attack, and can be used freely without professional knowledge.

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