Upon executing, the results display plaintext usernames alongside their hashed passwords: 1 UNION SELECT user, password FROM users # We’re on the home stretch! To retrieve the usernames and their corresponding hashed passwords, we’ll deploy this concise payload: Unlocking Credentials Fetching User Details These will be our focal points as we craft the final exploit. With this in hand, our query to fetch column names becomes: -1 UNION SELECT 1, column_name FROM information_lumns WHERE table_name='users'Īfter applying our hex conversion: -1 UNION SELECT 1, column_name FROM information_lumns WHERE table_name=0x7573657273Īmong the numerous fields, two stand out: user and password. As before, we’ll employ hexadecimal conversion to craft our payload.įor “users”, the hexadecimal representation is: users = 0x7573657273 Moving forward, our focus shifts to the columns within the “users” table. Of these, the “users” table piques our interest, promising valuable insights for our mission. Sending our modified request, we’re greeted with: A quick “text to hex” search will yield many options. While Python can achieve this (as demonstrated in a prior article), numerous online tools also exist. Typically, to fetch table names, we’d use: -1 UNION SELECT 1,table_name FROM information_schema.tables WHERE table_type='base table' AND table_schema='dvwa' īut, given our constraints, we’ll convert ‘base table’ and ‘dvwa’ to hexadecimal. The solution? Convert these strings into their hexadecimal form, a tactic we’ve previously explored. A challenge arises: we need strings without using quotes. With this foundational knowledge in hand, we’re primed for the subsequent steps! Unveiling Table Details with DVWA SQL Injection Medium Burpĭiving deeper, we now target table information. Additionally, we determine the schema name as “ dvwa“. Given that “VERSION()” is specific to MySQL, we ascertain the DBMS in use. Using the following queries, we can extract this data (note the “-1” ensures a singular result): -1 UNION SELECT DATABASE(), VERSION()# Next, we aim to identify the DBMS and its version. This confirms our query targets two columns. ![]() Upon executing the third command, an error emerges. When we type the third command we get an error, so we know that the vulnerable query contains just two columns. Instead of automating this with the intruder (for which a guide is available here), we’ll manually send requests via the repeater. If a column doesn’t exist for a given position, an error surfaces, revealing the column count. This clause sorts results based on column positions. Why? It’s crucial for leveraging the UNION clause effectively. So the game can start! Prepare yourself! Unearthing Database Details with DVWA SQL Injection Medium Burp Determining Column CountĮvery SQL injection tutorial emphasizes the importance of identifying column numbers. If no errors pop up, bingo! We’ve identified an SQL Injection vulnerability. No encoding is necessary since the data is sent via POST, not embedded in the URL. Test the waters with a simple payload: AND 1=1# Given the IDs are likely stored as INTs in the database, we won’t need quotes. Send the request to the repeater (right-click->send to the repeater) to make it easier to send our future requests. The POST request carries its variables in the body, but our strategy remains consistent with the low-security level. Observe the intercepted request in Burp Suite. Open its browser under the proxy tab and ensure “Intercept” is active. The main difference? We’re dealing with a POST request. With Burp Suite, our approach remains largely unchanged from our previous guide on DVWA Low-Security SQL injection. Notice the absence of an input field for SQL injection. Overview of the Vulnerable Application’s Functionalitiesįirst, adjust the DVWA difficulty to medium and navigate to the SQL Injection section.
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