> For the complete documentation index, see [llms.txt](https://itrp19-notes.gitbook.io/notes/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://itrp19-notes.gitbook.io/notes/reference/hacking/web-app-pentesting/sql-injection/time-based-sql-injection-blind.md). # Time based SQL Injection Blind In the time based, we rely on the time the webserver takes to send a response back to us. We can define a number of seconds in the SQL query that if the server takes the same time to respond, we conclude that it's vulnerable to SQL injection. ``` http://sumwebsite.com/profile?id=1 ``` As you know first we aim to find the number of columns. Then an example payload is the one below ``` 0' UNION SELECT SLEEP(5),2;-- ``` If the above one took 5 seconds of the webserver to respons, we knew then we have two columns. This means your criteria of a correct query is the time you defined with the \[sleep] function. --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter: ``` GET https://itrp19-notes.gitbook.io/notes/reference/hacking/web-app-pentesting/sql-injection/time-based-sql-injection-blind.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.