This is how the new table looks like in the PGAdmin INSERT INTO injected_table VALUES (2, Denis, Morgan) INSERT INTO injected_table VALUES (1, Bob, Martin)
We used the following code to create a new database table (“ injected_table”) and fill it with two entries: CREATE TABLE injected_table We will try to breach our self-made web server and get some data from a PostgreSQL database. QueryStr = "select * from injected_table where id = " + id + " and name = '" + name + "' order by id" "Driver=PostgreSQL ODBC Driver(ANSI) Server=localhost Port=54321 Database=test_db Uid=postgres Pwd=admin UseServerSidePrepare=1") nd_header("Content-type", "text/html charset=windows-1251") We saved the web server code in the webserv_inj.py file: import reįrom rver import BaseHTTPRequestHandler, HTTPServerĬlass InjectedServer(BaseHTTPRequestHandler): This server is designed to output information from database defined by the parameters in the URL string.
To perform our demonstration we need some “test dummy” application to be SQL-injected, so we use a simple web server written in Python. Here is more about methods of SQL injection detection. Potentially, this method can be used to get file system read/write access and operating system command execution depending on the DBMS back-end and the session user privileges.Īs you can see, Sqlmap is a powerful tool able not only to reveal vulnerabilities but to exploit them with various SQL injection techniques. This technique is used to perform injection of SQL statements other than SELECT (like data definition or data manipulation statements). If the target web application supports stacked queries, Sqlmap appends to the vulnerable parameter in the HTTP query a semicolon character ( ) followed by the SQL statement to be injected.
Such vulnerabilities occur when FOR cycle is not used and only the first entry of the query output is displayed. Sqlmap is able to exploit “partial” UNION query SQL injection vulnerabilities as well. This method is useful when the web application page uses FOR loop or similar to pass the output of the SELECT statement, so each line of the query output is printed on the page content. Sqlmap appends to the vulnerable parameter in the HTTP request syntactically valid SQL statement starting with UNION ALL SELECT. This method of SQL injection works only if the DBMS is configured to show back-end DBMS error messages. Then Sqlmap parses the HTTP response trying to find error messages containing injected SQL code and the subquery statement output within. Sqlmap appends to the vulnerable parameter in the HTTP request syntactically invalid statement string causing the database-specific error message. Then the utility performs a comparison between original response time and time spent on the injected query response and then infers the output of the injected statement character by character. Sqlmap appends to the vulnerable parameter syntactically valid statement, containing query which causes a delay in DBMS back-end for a certain number of seconds. Then Sqlmap compares each HTTP response with the original request and gets the output of the injected statement character by character. Sqlmap appends to the vulnerable parameter in the HTTP query syntactically valid SQL statement, containing a SELECT substatement or any other SQL statement used to retrieve output from the database. This free, open-source program is written in Python language and easy to use due to its command-line interface.Īccording to the official description, SQLmap can utilize the following SQL-injection techniques for penetration tests: SqlmapĪlthough there are a lot of various applications dedicated to perform automated vulnerability assessment, we use Sqlmap utility in our current experiment.
To show you what exactly happens when DataSunrise intercepts a malicious query, we perform a penetration testing with a dedicated software. In this article, we demonstrate you how DataSunrise prevents SQL injections which is one of the most popular hacker instruments of breaching web applications.