Terminal Overdrive

Challenge

Solution

Using ghidra to check file chal, easily to see that I can use 'pwd', 'ls', 'cat' from function 'evaluate_statement'
so I try to overflow by 11111111111111111111111111111111 cat flag.txt and get the flag (I just have got some lucky from this chall)

PACKShell v0.0.0.1.2.5l6.3
$ 111111111111111111111111111111111111111111111 cat flag.txt
flag.txt
flag{cH3ck_uR_bUFF3rz!1!}

Flag:

flag{cH3ck_uR_bUFF3rz!1!}

Original writeup (https://github.com/TwentySick/CTF/tree/main/2022/HackPack%20CTF/pwn/terminal_overdrive).