If you're stuck on a specific payload, try using Burp Suite to capture the request and use "Intruder" to test different characters automatically.
: Once a table of interest is identified, the next step involves determining the specific names of columns within that table to understand what data is stored. 5. Data Retrieval and Flags
The TryHackMe SQL Injection Lab is a virtual machine hosted on the TryHackMe platform, a popular online learning environment for cybersecurity enthusiasts. The lab provides a safe and controlled space to practice SQL injection attacks, with the goal of extracting sensitive data from a vulnerable database.
The most effective way to prevent SQL injection is to separate the data from the query logic.
To make the original query return no results, change the first ID to 0 . This way, the page only displays the results of your injected UNION query:
| Flag | Value | |------|-------| | Task 3 Flag | THMSQLi_Bypass | | Task 4 Flag | THMUnion_Based_SQLi | | Task 5 Flag | THMBlind_Boolean | | Task 6 Flag | THMTime_Based_Blind |
Now, extract the database name, version, and current user using the visible column positions (assuming columns 2 and 3 are visible): ' UNION SELECT 1, database(), version()-- Use code with caution. Note down the database name for the next step. Step 4: Extract Table Names
When there is no visual feedback, you use time delays to confirm your queries. admin123' UNION SELECT SLEEP(5),2;--
: If ORDER BY 3 works but ORDER BY 4 throws an error, the original query selects exactly 3 columns. Construct the UNION Query : Formulate the payload as: ' UNION SELECT 1, 2, 3-- - Use code with caution.
To perform a UNION based attack, you must know how many columns the original query returns. Use the ORDER BY clause incrementally. Payload: ' ORDER BY 1-- , ' ORDER BY 2-- , etc.
What is the admin password hash? ' UNION SELECT 1,group_concat(password),3 FROM users -- - Answer: 5f4dcc3b5aa765d61d8327deb882cf99
Assuming the backend database is MySQL, query the information_schema to find the tables:
Find out which columns display data on the screen by injecting null or dummy values: ' UNION SELECT 1, 2, 3-- Use code with caution.
SQL injection is a type of web application security vulnerability that allows attackers to inject malicious SQL code into a web application's database. In this article, we will provide a step-by-step guide to solving the SQL Injection lab on TryHackMe, a popular online platform for learning cybersecurity.
The key takeaway for any developer is to never trust user input. Utilizing modern web frameworks and prepared statements effectively mitigates the vast majority of SQLi risks.
Once an injection point is found, attackers look for metadata. Most database systems (like MySQL, PostgreSQL, or SQL Server) have built-in tables (e.g., information_schema ) that contain information about the database structure, including table names and column names.
