https://sec.vnpt.vn/2021/05/exploit-iot-ngay-nay-phan-1/
restricted syscall

https://sec.vnpt.vn/2022/01/exploit-iot-ngay-nay-phan-2/

https://sec.vnpt.vn/2022/09/exploit-iot-ngay-nay-phan-3/
cắm UART vào console để quan sát log từ shell UART.
sửa env trong bootcmd.

https://sec.vnpt.vn/2023/09/cach-bao-ve-cho-cac-thiet-bi-iot-trong-he-thong-smarthome/
Hacker's Guide to UART Root Shells
https://www.youtube.com/watch?app=desktop&v=01mw0oTHwxg