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The command would then be sent to a database server, and the resulting dataset would determine whether the username and password correspond to a valid user account. For instance, in PHP, the code would look something like the following: $sql_command = "select * from users where username = '". When users enter their credentials and press the “log in” button, the information is posted back to your web server, where it is combined with an SQL command. To see how it works, suppose you have a login form that takes a username and password: Any input channel can be used to send the malicious commands, including elements, query strings, cookies and files. SQL injection attacks are staged by sending malicious SQL commands to database servers through web requests.
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Here’s what you need to know about SQL injection and how to protect your site against it. The scheme can be used by attackers to steal or tamper with data, hamper application functionality, and, in a worst-case scenario, gain administrative access to the database server. In a nutshell, SQL injection - also referred to as SQLi - uses vulnerabilities in a website’s input channels to target the database that sits in the backend of the web application, where the most sensitive and valuable information is stored. The scheme has been used to target well-known organizations and firms, including TalkTalk, VTech, Wall Street Journal and the U.S. Of all the attacks that can be staged against websites, SQL injection is among the most dangerous and pervasive kind, and has been used to deal real damage to businesses and organizations in the past year. Thanks to Chris Lienert and Guido Tonnaer for kindly helping to peer review this article.