The explanation about SQL Injection and data mining with this technique, Out-of-band attacks employ a different communications channel to drill for data by using database mail or HTTP functions for example. Inference attacks stand alone in the fact that no actual data is transferred – rather, a difference in the way an application behaves can allow an attacker to infer the value of the data. This scenario is not sensationalist - it’s an easy attack that can be leveled against a SQL injection vulnerability. Manipulating Microsoft SQL Server Using SQL Injection” [12] and provided a tool called DataThief with the paper to enable data querying via the openrowset function. In the first week of September 2003 Ofer Maor and Amichai Shulman release a paper “Blindfolded SQL injection” Data-mining with SQL Inference When exploiting a SQL injection vulnerability there are three classes of data extraction methods that can be used to drill for data: inband, out-of-band and inference. Inband methods use the existing channel between the attacker and application to extract data. SELECT CASE WHEN condition THEN 1 ELSE 1/0 END Only if the condition is not met will an error be generated – otherwise the query would return 1. This technique works extremely well with SQL Server, Oracle and DB2 but not so well with MySQL or Informix.
Tags : inference attacks, microsoft sql server, amichai, mail, communications channel, maor, extraction methods, data extraction, ofer, shulman, informix, data mining, attacker, db2, vulnerability
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