OSEC

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Wordpress Kish Guest Posting Plugin 1.0 (uploadify.php) Unrestricted File Upload Vulnerability

n0b0d13sgmail.com
Date: Mon Jan 23 2012 - 14:29:59 CST


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Wordpress Kish Guest Posting Plugin 1.0 (uploadify.php) Unrestricted File Upload
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author............: Egidio Romano aka EgiX
mail..............: n0b0d13s[at]gmail[dot]com
software link.....: http://kishpress.com/guest-posting-plugin/
 
+-------------------------------------------------------------------------+
| This proof of concept code was written for educational purpose only. |
| Use it at your own risk. Author will be not responsible for any damage. |
+-------------------------------------------------------------------------+

[-] vulnerable code in /uploadify/scripts/uploadify.php

26. if (!empty($_FILES)) {
27. $tempFile = $_FILES['Filedata']['tmp_name'];
28. $targetPath = $_SERVER['DOCUMENT_ROOT'] . $_REQUEST['folder'] . '/';
29. $targetFile = str_replace('//','/',$targetPath) . $_FILES['Filedata']['name'];
30. // $fileTypes = str_replace('*.','',$_REQUEST['fileext']);
31. // $fileTypes = str_replace(';','|',$fileTypes);
32. // $typesArray = split('\|',$fileTypes);
33. // $fileParts = pathinfo($_FILES['Filedata']['name']);
34.
35. // if (in_array($fileParts['extension'],$typesArray)) {
36. // Uncomment the following line if you want to make the directory if it doesn't exist
37. // mkdir(str_replace('//','/',$targetPath), 0755, true);
38.
39. move_uploaded_file($tempFile,$targetFile);
40. echo str_replace($_SERVER['DOCUMENT_ROOT'],'',$targetFile);
41. // } else {
42. // echo 'Invalid file type.';
43. // }
44. }

Restricted access to this script isn't properly realized, so an attacker might be able to upload
arbitrary files containing malicious PHP code due to uploaded file extension isn't properly checked.

[-] Disclosure timeline:

[19/12/2011] - Vulnerability discovered
[19/12/2011] - Vendor notified through http://kish.in/contact-me/
[07/01/2012] - No response from vendor, notified again via email
[16/01/2012] - After four weeks still no response
[23/01/2012] - Public disclosure

[-] Proof of concept:

http://www.exploit-db.com/exploits/18412/