Joomla! Component JE Messenger 1.0 – Arbitrary File Upload

• Exploit Database
• 149 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/
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  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.