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Ajax File And Image Manager 1.0 Final Code Execution

Ajax File And Image Manager 1.0 Final Code Execution
Posted Nov 4, 2011
Authored by EgiX

Ajax File and Image Manager version 1.0 Final suffers from a remote code execution vulnerability.

tags | exploit, remote, code execution
SHA-256 | 6427b2ce0ea6eef0fb994e9e31c3401cd3d462ad67c797d5715102c07d0f346b

Ajax File And Image Manager 1.0 Final Code Execution

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Ajax File and Image Manager v1.0 Final Remote Code Execution Vulnerability
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author...........: Egidio Romano aka EgiX
mail.............: n0b0d13s[at]gmail[dot]com
software link....: http://www.phpletter.com/


[-] Vulnerability explanation:

The vulnerable code is located into /ajaxfilemanager/ajax_create_folder.php:

11. @ob_start();
12. displayArray($_POST);
13. writeInfo(@ob_get_clean());

this script start the output buffering at line 11 and then call the 'displayArray'
function that simply displays the $_POST array content with the print_r() function,
and finally at line 13 is called the 'writeInfo' function using the current buffer
contents as parameter (that is the $_POST array content). Now look at the 'writeInfo'
function body defined into /ajaxfilemanager/inc/function.base.php:

228. function writeInfo($data, $die = false)
229. {
230. $fp = @fopen(dirname(__FILE__) . DIRECTORY_SEPARATOR . 'data.php', 'w+');
231. @fwrite($fp, $data);
232. @fwrite($fp, "\n\n" . date('d/M/Y H:i:s') );
233. @fclose($fp);

It writes the $data paramater into a file called 'data.php' without any check,
so an attacker could be able to inject and execute arbitrary PHP code.


[-] Disclosure timeline:

[21/10/2011] - Vulnerability discovered
[24/10/2011] - Issue reported via e-mail
[25/10/2011] - Vendor replied that a fix will be released in the next version
[04/11/2011] - Public disclosure

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