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#ADVANCED SQL INJECTION TOOL CODE#
Since Oracle does not support stacked queries in dynamic SQL queries, the only way to get the statement above executed by the database would be to find an SQL injection vulnerability in PL/SQL code or in an anonymous PL/SQL block. The example below shows how a hacker could identify if a parameter is vulnerable to SQL injection using this technique (a slow response would mean the application uses a MySQL database).Įxecuting SLEEP() in Oracle (execution suspended 15 seconds). Since SLEEP() and BENCHMARK() are both functions, they can be integrated in any SQL statement. Injecting a time delay for this DBMS is pretty straight forward. IF condition THEN when_true END IFĪs you can guess, the injected segments will differ slightly depending of the purpose of the time-based attack. Let’s now see how these attacks can be done in different DBMS.
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IF condition when_true Ĭan only be used in stored procedure or in an independent stacked query. In stored procedure the syntax is identic to Oracle's. Below is a reference of basic conditional statements in each database system. This will allow the attacker to know if the condition was true or false. Depending if the condition is verified or not, the time delay will be executed and the server response will be abnormally long. Simply put, by injecting a conditional time delay in the query the attacker can ask a yes/no question to the database. This technique relies on inference testing which is explained in this article. When the time delay is integrated in a conditional statement, the attacker will be able to retrieve information from the database an even extract data. Identifying vulnerabilities is not the only utility of time-based attacks.
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If none of the above generates a slow response, fallback to techniques enumerated in the article about database fingerprinting. You can try to inject delay functions until you find one that generates a positive result. Note: Always make sure you know which database system is used before beginning your time-based tests. Refer to Oracle section below for more information. Time-based attacks are a more complicated in Oracle.
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Suspends the execution of the query and continues it when system time is equal to parameter. For more information about this procedure consult SQL Server official documentation. Suspends the execution for the specified amount of time. More details about the function on MySQL website. By using a large number as first parameter, you will be able to generate a delay. More details here.Įxecutes the specified expression multiple times. It takes a number of seconds to wait in parameter. The table below shows how the query execution can be paused in each DBMS. In this situation, only delay functions/procedures are necessary. This is usually an excellent option when the attacker is facing a deep blind SQL injection. Time-based attacks can be used to achieve very basic test like determining if a vulnerability is present. As you can guess, this type of inference approach is particularly useful for blind and deep blind SQL injection attacks. Depending on the time it takes to get the server response, it is possible to deduct some information. This kind of attack injects a SQL segment which contains specific DBMS function or heavy query that generates a time delay. Time-based techniques are often used to achieve tests when there is no other way to retrieve information from the database server.