Re: SQL Injection
From: Kevin Spett (kspett@spidynamics.com)Date: 06/11/02
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From: "Kevin Spett" <kspett@spidynamics.com> To: "Qyves" <zqyves@netscape.net>, <pen-test@securityfocus.com> Date: Tue, 11 Jun 2002 16:57:57 -0400
> I am currently pen-testing a web app and I am stuck in trying to execute
two queries sequentially in Oracle.
> To my knowledge I can do this in SQL by separating the two queries with ;
however this is no happening in my case in two circumstances...
You won't have luck with this in Oracle. Their ODBC driver prevents
multiple statements from reaching the server. I don't know of any way to
circumvent this. You may want to try the -- comment character though. It
will work on occasion, depending on how the ODBC stuff is configured. No
clue what it needs to look like from the sysadmin's perspective, but I have
seen web apps that use Oracle backends that it will work on.
> Case1:
> I have a discovered an injectable sql query that is fed its data from a
web form, the end query build by a cgi-script being
> something along those lines:
> (insert into tab_nam values ('a','b','c','d','e')); - a-e values from the
web form- with me being able to inject through
> concatenation and subqueries between any of those fields a SELECT query.
> e.g.
> e='||select password from users where username='adm'||'
> query=(insert into tab_nam values ('a','b','c','d',''||select password
from users where username='adm'||''));
> I tried an INSERT to no avail, fair enough since I don't thing that
INSERTs are allowed in nested queries... (or are they??)
> The last characters added by the cgi script are the ));
You are correct. An INSERT in a subquery is bad syntax.
> Case 2:
> I have also found a second query I can insert to and parts of it are
actually shown raw in the URL as an input to a servlet
> script e.g. /stupid.cgi?A=123%20AND%20%ID=101
> This query appers to be something in the form of:
> SELECT foo from bar where [URL] ;
> I can inject an OR 1=1 in the above Url and get all the rows... However
when I try the sequential queries again I fail
> miserably url=/stupid.cgi?A=123%20AND%20%ID=101%20OR%201=1
> original url=/stupidservlet?A=123%20AND%20%ID=101
> modified url=/stupidservlet?A=123%20AND%20%ID=101; insert into powerusers
values ('test', 'pwd)
> I have full control over the url however I get just a "Server Error" back.
> Any clues on how to make any of these methods work anyone??
Just do a plain old vanilla UNION SELECT. Ttry something like this
(remember to convert the spaces to + or %20):
/stupidservlet?A=123 AND 1=0 UNION SELECT name FROM cat WHERE 1=1
(that'll give you table names)
I'm going to be updating my SQL Injection paper
(http://www.spidynamics.com/whitepapers.html I think) in the next two weeks
with my findings in Oracle.
I hope that helped.
Kevin Spett
SPI Dynamics, Inc.
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- Previous message: Oliver Petruzel: "Testing other prot's and layers."
- In reply to: Qyves: "SQL Injection"
- Next in thread: Breidenbach, Beth: "RE: SQL Injection"
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