RE: Blind SQL Injection / Stored procedures

["LAROUCHE Francois" <Francois.Larouche () accorservices com>]

Hola Andres,

> Sorry for that not making it clear. I have discovered that there were
> multiple databases in the server so I tried to enumerate the tables and
> columns in those too. It should say 'Database..syscolums'.

Ah ok gotcha!

> I don't really understand the "res" field you mention. As I understand I
> will only need to create the table with the fields the proc is >outputting...
> hope you can explain this a bit more...

Sorry about that, I know it wasn't entirely clear. It's the name of the field that I created in the table. I called it 
res to keep it cryptic in case someone was doing some forensic after or looking during my pen tests. Yeah I know... 
it's not really that cryptic but it's better than OutputOfMySQLinjection... :)

Here are the steps you should do:

1. a) See if you have access to the database Pubs or Northwind and creation rights (mea culpa to have said differently 
the last time, you have a lot of rights on those databases but not the creation rights by default) But if you have the 
rights, it's a safer place to mess up than the production database
b) If you don't, try to create a table in the database your user belongs to (a big warning here, you have better to be 
sure of the consequences here...)
c) If you can't, try on a different database on your list (Again at your own risk...)
d) If you still can't well sorry... I think there is no other way except those already mentioned by the others (by the 
way to execute xp_makewebtask you need to have high user privileges something you are obviously not)

2. So if you can create a table, create it with the fields you expect to receive from your stored proc. What I usually 
do is to create a table with 6 nvarchar(4000) and 6 int, with this I cover most of my needs

3. Once the table created you fill it up with the data of your stored proc during your SQL injection

Ex:

'; TRUNCATE table pubs.dbo.tmp; INSERT INTO pubs.dbo.tmp (res) EXEC
MyDB..TheStoredProc

4. Once this table filled, you can go read the data according to the SQL injection method you used at the first place 
to read data in the syscolumns table. Since you didn't confirm if it was by blind injection or not, I cannot help you 
there.

Let's say it's the classic way:

aaa' UNION SELECT res FROM pubs.dbo.tmp--

5. And after, you should drop the created table (dangerous manipulation if you get the wrong one by accident)

I think it should be clearer now. I think I cannot go beyond with the syntax than that without seeing exactly your web 
site. Hopefully it will be enough, tell me if it helped.

Final note: everything that I stated are how things could be done, there are some risks in doing some of them, 
especially the drop table operation. So I won't be held responsible for any accident :)

Buena suerte

François Larouche

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