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

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

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']);
    

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);
    

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/