SQL injection UNION attack, retrieving data from other tables

https://portswigger.net/web-security/sql-injection/union-attacks/lab-retrieve-data-from-other-tables

Let's filter for Gifts.

Since we are proxying the traffic through Burp Suite, we can go to the Proxy > HTTP History tab to view this request.

Let's forward this request to the Repeater for further modification.

Once in the Repeater, let's set the category parameter to the following:

' UNION SELECT 'test'--

Since the application returns an error, we know that the number of columns in the current query is more than 1.

Let's set the category parameter to the following:

' UNION SELECT 'test', 'test'--

Now that we know the current query has two columns, we can retrieve the usernames and password from the username and password columns respectively.

' UNION SELECT username, password FROM users--

We can now login as the admin using the following credentials:

Username	Password
administrator	21tpnvx8ho5pyej8z6sy

We have solved the lab.