pawnlord

Intro to Pwn Syntax Helper

pwntools

Some basic syntax to get you started with using pwntools in python scripts.
Official documentation for further reading: https://docs.pwntools.com/en/stable/intro.html#tutorials

Getting started

You can install it with this:

python3 -m pip install pwntools

pawnlord

from pwn import *

chal = ELF("./chal")
context.binary = chal

musl = ELF("./libc.musl-x86_64.so.1")
mimalloc = ELF("./libmimalloc.so.2.2")

r = remote("doremi.chal.uiuc.tf", 1337, ssl=True)

pawnlord

vals = [1804289383,
846930886,
1681692777,
1714636915,
1957747793,
424238335,
719885386,
1649760492,
596516649,
1189641421,

pawnlord

from pwn import *
import rand_vals as rv

def get_hex(s, delim=b"0x"):
    mlprint(s)
    l = s.split(delim)
    numbers = []
    for seg in l[1:]:
        try:
            numbers.append(int(seg.split()[0], 16))

pawnlord

with open("vmvm.vm", "rb") as vm_file:
    vm = vm_file.read()

addrs_to_lines = {}


def read_int(counter):
    global vm
    return vm[counter] \
            + (vm[counter + 1] << 8) \

pawnlord

typecheck

Hint:

My C++ code won't type check. Can you fix that for me?
Note: you will need to set -ftemplate-depth=10000 when compiling.

overview

This was a C++ rev challenge involving the template system. It had an input which was the flag, and an input that was the program. It created lists using some variadic templates, and then could use stack like behavior by popping or pushing by invoking further templates.

pawnlord

import cv2
import numpy as np
import sys

colors = ["    ", "____", "/**/", "iiii", "aaaa", "aaaa"]

multiplier = len(colors) - 1

def read_greyscale(imagename):
    img = cv2.imread(imagename)