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Basics of SQL-Injections


Web Applications relay on dynamic content to achieve the appeal of traditional desktop windowing programss. This dynamism is typically achieved by retrieving updated data from a database. One of the more popular platforms for web datastores is SQL, and many web applications are based entirely on front-end scripts that simply query an SQL database, either on the web server itself or a spearate back-end system. One of the most insidious attacks on a web application involves hijacking the queries used by the front-end scripts themselves to attain control of the application or its data. One of the most efficient mechanisms for achieving this is a technique called SQL-Injection.

SQL-Injection refers to inputting raw Transact SQL queries into an application to perform an unexpected action. Often, existing queries are simply edited to achieve the same results-- Transact SQL is easily mnipulated by the placement of even a single character in a judiciously chosen spot, causing the entire query to behave in quite malicious ways. Some of the characters commonly used for such input validation attacks include the backtick ( ` ), the double dash ( -- ). and the semicolon ( ; ), all of which have special meaning in transact SQL


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