I used some vulnerability scanners to check a site of mine, and an instance of blind SQL injection was returned. However, when I try to exploit this vulnerability by entering the following into the address bar, nothing happens:

http://www.example.com/articles.php?id=-1' or 68 = '66; DROP ALL TABLES; --

I don't see why this isn't working. What is the correct text I must enter into the address bar to drop all the tables (and yes, I am testing this on a backup copy of the site)?

  • 1
    PHP and MySQL? What API do you use?
    – Gumbo
    Apr 7, 2013 at 16:18
  • @Gumbo, sorry, yes PHP and MySQL with mysqli.
    – Pamela
    Apr 7, 2013 at 16:39
  • 2
    Well, in case you use mysqli_query, you’re probably not allowed to execute multiple statements at once. You would need mysqli_multi_query instead.
    – Gumbo
    Apr 7, 2013 at 16:44

2 Answers 2


The vast majority of web applications do not allow query stacking. With PHP/MySQL application can allow for query stacking if you use the mysqli::multi_query()or mysqli_multi_query() functions.

You can exploit these systems using sub-select, union-selects, blind sql injection, into outfile, or loadfile(). SQLMap and Havij are both tools that automate the exploitation of SQL Injection. SQLMap is a great tool with a wide range of features, and supports a wide verity of injections and DBMS'es.

  • 1
    I'm also rather fond of the tool 'Havij' which is quite simply 'Aim and Fire' in most cases
    – NULLZ
    Apr 11, 2013 at 14:51

If the site does not use apostrophes (') you can try this:

http://www.example.com/articles.php?id=-1; DROP ALL TABLES; --
  • 1
    It is still not working. It just displays the page as is.
    – Pamela
    Apr 7, 2013 at 16:36
  • 9
    Query stacking doesn't work in the real world, only in comic books and MS-SQL.
    – rook
    Jun 2, 2017 at 1:48

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