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SQL Injection refers to the exploitation of a SQL database vulnerability caused by the lack of masking or validation of meta-characters in user input. The attacker attempts to inject his own database commands through the application which has access to the database. As the request is not validated correctly, the inserted code changes the original SQL commands and therefore alters the results in favor of the attacker. With a successful attack, the attacker is able to spy on data, modify it or delete it altogether, and gain control over the server. For this to work, the attacker has different ways to breach the system. For example it is possible to find a way into the system via response time or error messages.

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