ocean1

import dis, marshal, struct, sys, time, types

def show_file(fname):
    f = open(fname, "rb")
    magic = f.read(4)
    moddate = f.read(4)
    modtime = time.asctime(time.localtime(struct.unpack('<I', moddate)[0]))
    print "magic %s" % (magic.encode('hex'))
    print "moddate %s (%s)" % (moddate.encode('hex'), modtime)
    code = marshal.load(f)

ocean1

# took from here
# http://codahale.com/a-lesson-in-timing-attacks/

def is_equal(a, b):
    if len(a) != len(b):
        return False

    result = 0
    for x, y in zip(a, b):
        result |= x ^ y

ocean1

00413CAB   5D               POP EBP
00413CAC   81ED 38324000    SUB EBP,video.00403238
00413CB2   64:8B1D 30000000 MOV EBX,DWORD PTR FS:[30]		;PEB
00413CB9   8B5B 0C          MOV EBX,DWORD PTR DS:[EBX+C]	;PPEB_LDR_DATA, LoaderData
00413CBC   8B5B 1C          MOV EBX,DWORD PTR DS:[EBX+1C]	;InInitializationOrderModuleList
00413CBF   8B1B             MOV EBX,DWORD PTR DS:[EBX]		;get first loaded dll
00413CC1   8B5B 08          MOV EBX,DWORD PTR DS:[EBX+8]	;module base
00413CC4   89DA             MOV EDX,EBX
00413CC6   8995 EB324000    MOV DWORD PTR SS:[EBP+4032EB],EDX
00413CCC   89D3             MOV EBX,EDX

ocean1

from pwn import *
context(arch='i386', os='linux', log_level="info")

HOST = args.get('HOST', "localhost")
PORT = 4000

got_exit = 0x804A010

# account in the shellcode that when we overwrite prev/next
# it may overwrite part of the shellcode, we want to jump over

ocean1

#!/bin/bash
#
# The BSD License (http://www.opensource.org/licenses/bsd-license.php) 
# specifies the terms and conditions of use for checksec.sh:
#
# Copyright (c) 2009-2011, Tobias Klein.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without 
# modification, are permitted provided that the following conditions 

ocean1

from pwn import *

context(arch='i386', os='linux', log_level="info")

DEBUG = False
HOST = "cybergrandsandbox_e722a7ec2ad46b9fb8472db37cb95713.quals.shallweplayaga.me"
PORT = 4347


def spliteach(x, n):

ocean1

#include <stdio.h>
#include <string.h>
 
int
main()
{
	FILE *maps;
	void *vdso_begin, *vdso_end;
 
	maps = fopen("/proc/self/maps", "r");

ocean1

# patching the vulnerable binary just requires to reduce the size of the read up to 0x200 :)

from pwn import *

context(arch='i386', os='linux', log_level="info")

DEBUG = False
HOST = "cybergrandsandbox_e722a7ec2ad46b9fb8472db37cb95713.quals.shallweplayaga.me"
PORT = 4347

ocean1

Keybase proof

I hereby claim:

• I am ocean1 on github.
• I am oce4n (https://keybase.io/oce4n) on keybase.
• I have a public key whose fingerprint is AD2F 69FC 908C 05C4 EE1C A1F7 5B7C EDEB A937 0413

To claim this, I am signing this object:

ocean1

# This file has been auto-generated by i3-config-wizard(1).
# It will not be overwritten, so edit it as you like.
#
# Should you change your keyboard layout somewhen, delete
# this file and re-run i3-config-wizard(1).
#

# i3 config file (v4)
#
# Please see http://i3wm.org/docs/userguide.html for a complete reference!