[https://crcksec.blogspot.com/2020/10/syskron-ctf-2020-beginner-writeup.html#vuln_rtos](https://crcksec.blogspot.com/2020/10/syskron-ctf-2020-beginner-writeup.html#vuln_rtos)

Original writeup (https://crcksec.blogspot.com/2020/10/syskron-ctf-2020-beginner-writeup.html#vuln_rtos).