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

Description

-------------------------------------------------------------------------------- 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']); 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/