SQL injection is a technique for exploiting web applications that use client-supplied data in SQL queries without stripping illegal characters first. Despite being remarkably simple to protect against, there is an astonishing number of production systems connected to the Internet that are vulnerable to this type of attack. The objective of this paper is to educate the professional security community on the techniques that can be used to take advantage of a web application that is vulnerable to SQL injection as well as make clear the correct mechanisms that should be put in place to protect against SQL injection, as well as input validations problems in general.
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