![]() Notice that at this step, it is not even necessary to specify column names since a minimal SELECT statement can be used. ![]() Even if database systems have different naming convention, the number of popular DBMS is really limited and a valid system table name can be found quickly. Guessing may be an option to find a table name that exists in the database (a good one in some cases), but let’s consider an approach that will guarantee successful results even if luck is not on your side. The best way to find such information is to use system tables instead of user tables. For more information refer to the last section of the article. ![]() However, the same principle would apply if it was not the case. To simplify learning, this article explains how it can be done when error reporting is enabled. To do this, a valid table name must be known but it is also necessary to determine the number of columns in the first query and their data type. Because the UNION operator can only be used if both queries have the exact same structure, the attacker must craft a SELECT statement similar to the original query. ![]() UNION-based attacks allow the tester to easily extract information from the database. ![]() Understanding how to create a valid UNION-based attack to extract information ![]()
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