You can find the Writeup over here!
[it-sec.fail - k3rn3l-ctf / Kiddie Pool / 3in1](https://www.it-sec.fail/k3rn3l-ctf-2021-kiddie-pool-3in1/)

Original writeup (https://www.it-sec.fail/k3rn3l-ctf-2021-kiddie-pool-3in1/).