epending on the result, an HTTP response will be returned with a delay, or returned immediately. The response time will indicate to the attacker whether the result of the query is TRUE or FALSE. Time-based SQL Injection is an inferential SQL Injection technique that relies on sending an SQL query to the database which forces the database to wait for a specified amount of time (in seconds) before responding. This allows an attacker to infer if the payload used returned true or false, even though no data from the database is returned. Depending on the result, the content within the HTTP response will change, or remain the same. The two types of inferential SQL Injection are Blind-boolean-based SQLi and Blind-time-based SQLi.Д«oolean-based SQL Injection is an inferential SQL Injection technique that relies on sending an SQL query to the database which forces the application to return a different result depending on whether the query returns a TRUE or FALSE result. Instead, an attacker is able to reconstruct the database structure by sending payloads, observing the web applicationвЂ™s response and the resulting behavior of the database server. In an inferential SQLi attack, no data is actually transferred via the web application and the attacker would not be able to see the result of an attack in-band (which is why such attacks are commonly referred to as вЂњblind SQL Injection attacksвЂќ).

Inferential SQL Injection, unlike in-band SQLi, may take longer for an attacker to exploit, however, it is just as dangerous as any other form of SQL Injection. Union-based SQLi is an in-band SQL injection technique that leverages the UNION SQL operator to combine the results of two or more SELECT statements into a single result which is then returned as part of the HTTP response. In some cases, error-based SQL injection alone is enough for an attacker to enumerate an entire database. The two most common types of in-band SQL Injection are Error-based SQLi and Union-based SQLi.Д®rror-based SQLi is an in-band SQL Injection technique that relies on error messages thrown by the database server to obtain information about the structure of the database. In-band SQL Injection occurs when an attacker is able to use the same communication channel to both launch the attack and gather results. In-band SQL Injection is the most common and easy-to-exploit of SQL Injection attacks.

Sql injection tool linux