Joomla! Component JE Messenger 1.0 – Arbitrary File Upload

• Exploit Database
• 5 阅读

• 作者： Salvatore Fresta
  日期： 2010-12-09
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/15719/

• JE Messenger 1.0 Arbitrary File Upload Vulnerability
  
   NameJE Messenger
   Vendorhttp://joomlaextensions.co.in
   Versions Affected 1.0
  
   AuthorSalvatore Fresta aka Drosophila
   Website http://www.salvatorefresta.net
   Contact salvatorefresta [at] gmail [dot] com
   Date2010-12-09
  
  X. INDEX
  
   I.ABOUT THE APPLICATION
   II. DESCRIPTION
   III.ANALYSIS
   IV. SAMPLE CODE
   V.FIX
   
  
  I. ABOUT THE APPLICATION
  ________________________
  
  JE Messenger is a Joomla's component.
  
  
  II. DESCRIPTION
  _______________
  
  A parameter is not properly sanitised beforebeing used
  from the native Joomla's upload function.
  
  
  III. ANALYSIS
  _____________
  
  Summary:
  
   A) Arbitrary File Upload
   
  
  A) Arbitrary File Upload
  ________________________
  
  A logic error in the save function(compose.php)allows
  to a registered user to upload a file with any extension.
  The check for a valid file's extension is madeafter the
  upload and in the failure case, the file doesn'tremoved
  from the server. This can be exploitedtoexecute 
  arbitrary PHP code by uploading a PHP file.
  
  The file's name is different after the upload:
  
  $file['name'] = time().'in'.$file['name'];
  
  Example:
  
  Original file's name: shell.php
  Uploaded file's name: 1291907399inshell.php
  
  Where1291907399isthevalue returns from the time()
  function.
  
  The file will be uploaded to the following directory:
  
  $dest = JPATH_ROOT.DS.'components/'.$option.'/assets/images/'.$file['name'];
  
  The default destination is:
  
  http://site/path/components/com_jemessenger/assets/images/
  
  
  IV. SAMPLE CODE
  _______________
  
  A) Arbitrary File Upload
  
  1 - Login to target website's Joomla
  2 - Go to http://site/path/index.php?option=com_jemessenger&view=compose
  3 - Compile a valid form and select an arbitrary file
  4 - Go to http://site/path/components/com_jemessenger/assets/images/filename
  
  
  Try a little bruteforce to find the valuereturnedfrom
  the time() function.
  
  
  V. FIX
  ______
  
  No fix.