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print["https://github.com%s"%x[9:-1]for x in __import__('re').findall('<a href="/[a-zA-Z0-9_]+/[a-zA-Z0-9_]+">',__import__('urllib2').urlopen("https://github.com/trending").read())if "/site/" not in x]

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syntax enable
set background=dark
colorscheme molokai

filetype plugin indent on

let &t_SI .= "\<Esc>[?2004h"
let &t_EI .= "\<Esc>[?2004l"

inoremap <special> <expr> <Esc>[200~ XTermPasteBegin()

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int overflow()
{
  char buf[136];
  return read(0, &buf, 256u);
}

int main()
{
  overflow();
  return write(1, "WIN\n", 4u);

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//
//  challenge_6.c
//  Matasano Crypto Challenge

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

char* HEX_LOOKUP = "0123456789abcdef";

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(lambda s=__import__("socket").socket():s.bind(('',9237))==s.listen(5)==map(lambda c,d:c.send(c.recv(99)),(s.accept()[0]for _ in iter(int,1))))()

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Backdoor CTF 2015 team Writeup

TL;DR

• Format string

Given that this challenge was 600 points, I expected to be challenged with this one. But with 91 solves I think the people at SDSLabs kinda messed up on the points for this one lol.

Checking out what type of file we were dealing with here:

[~/Documents/CTFs/backdoor]$ file team

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void randop() {
  munmap((void*)0x0F000000, MAPLEN);
  void *buf = mmap((void*)0x0F000000, MAPLEN, PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE|MAP_FIXED, 0, 0);
  unsigned seed;
  if(read(0, &seed, 4) != 4) return;
  srand(seed);
  for(int i = 0; i < MAPLEN - 4; i+=3) {
      *(int *)&((char*)buf)[i] = rand();
      if(i%66 == 0) ((char*)buf)[i] = 0xc3;
  }

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tab_depth = 0


def log(s=None, **kwargs):
    global tab_depth
    msg = s if s is not None else ", ".join(["{} == {}".format(k, v) for k, v in kwargs.items()])
    print("\t" * tab_depth + msg)

def perms(n, l):
    global tab_depth

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Exploit Exercises

Pwnable.kr

RPISEC Pwning Course

Sploitfun

Vulnhub

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