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Re: Fwd: mysql selecting into outfile in an insert
From: Michael McGrew <mmcgrew1 () mail csuchico edu>
Date: Wed, 21 Jul 2010 11:46:39 -0700

MySQL does support stacked queries, it's usually the programming
language that's interacting with it that does not. Looking into this,
I found a neat PHP function that allows stacked queries,
http://www.php.net/manual/en/mysqli.multi-query.php

There is also a white paper (pg 6) that states that ASP .NET supports
stacked queries to MySQL, I would be interested in experimenting with
this.
http://sqlmap.sourceforge.net/doc/BlackHat-Europe-09-Damele-A-G-Advanced-SQL-injection-whitepaper.pdf

mysql> select sysdate(); select sysdate();
+---------------------+
| sysdate()           |
+---------------------+
| 2010-07-21 11:41:36 |
+---------------------+
1 row in set (0.00 sec)

+---------------------+
| sysdate()           |
+---------------------+
| 2010-07-21 11:41:36 |
+---------------------+
1 row in set (0.00 sec)

mysql>



On Tue, Jul 20, 2010 at 5:00 PM, Ulisses Castro <uss.thebug () gmail com> wrote:
MySQL doesn't support stacked querys, unfortunately you can't stack
querys like postgresql, mssql, ...

On Tue, Jul 20, 2010 at 7:09 PM, Michael McGrew
<mmcgrew1 () mail csuchico edu> wrote:
If you can inject SQL could you end the query with ; then start a new
select query where you use INTO OUTFILE?

This is why it's not working:
"An INTO clause should not be used in a nested SELECT because such a
SELECT must return its result to the outer context. "
http://dev.mysql.com/doc/refman/5.0/en/select.html



On Tue, Jul 20, 2010 at 2:23 PM, Robin Wood <robin () digininja org> wrote:
I sent this to the webappsec mailing list but thought I'd send it here
as well looking for some SQL Injection experts.


---------- Forwarded message ----------

I've got a vulnerable web app with a MySQL backend where I can inject
into an INSERT query and I want to create a file. With a SELECT I
would use a UNION and then SELECT whatever INTO OUTFILE "filename" but
how do you do it with an INSERT query?

I tried:

INSERT INTO size VALUES (22, (SELECT "abc" INTO OUTFILE "/tmp/test")) ;

That executes and size gets a new row with 22 and "abc" in it but it
doesn't create the file.

I also tried an UPDATE and had the same problem:

UPDATE size SET big=22 WHERE big =  (SELECT "abc" INTO OUTFILE "/tmp/test");

The update happens where big="abc" but no outfile.

Can it be done?

Robin
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