-Simple SWF Fuzzer (Python, PyDbg)-
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | # -*- coding: utf-8 -*- from pydbg import * from pydbg.defines import * import utils import random import threading import os import shutil import time import ctypes class file_fuzzer: def __init__(self, exe_path): self.targetfile = "original_file" self.copyfile = "mutated_file" self.ext = 'swf' self.mutate_key = {} self.mutate_count = 5000 self.exe_path = "target_path" self.iteration = 0 self.crash = None self.pid = None self.in_accessv_handler = False self.dbg = None self.running = False self.ready = False self.eip = None def fuzz(self): while 1: if not self.running: self.iteration += 1 try: shutil.copy(self.targetfile, self.copyfile) self.mutate_file() except: pass pydbg_thread = threading.Thread(target=self.start_debugger) pydbg_thread.setDaemon(0) pydbg_thread.start() while self.pid == None: time.sleep(1) monitor_thread = threading.Thread(target=self.monitor_debugger) monitor_thread.setDaemon(0) monitor_thread.start() else: time.sleep(1) def start_debugger(self): print "\n[ * ] Starting Debugger for iteration : %d" % self.iteration self.running = True self.dbg = pydbg() self.dbg.set_callback(EXCEPTION_ACCESS_VIOLATION, self.check_accessv) pid = self.dbg.load(self.exe_path, self.copyfile) self.pid = self.dbg.pid self.dbg.run() def monitor_debugger(self): counter = 5 print "[ * ] Monitor_thread for pid : %d" % self.pid while counter > 0: time.sleep(1) print "Terminate Countdown : %d" % counter counter -=1 if self.in_accessv_handler != True: time.sleep(1) self.dbg.terminate_process() self.pid = None self.running = False else: print "[ * ] The access violation handler is doing its business" while self.running: time.sleep(1) def check_accessv(self, dbg): print "\n[ * ] Handling an access violation!\n ", self.in_accessv_handler = True crash_bin = utils.crash_binning.crash_binning() self.crash = crash_bin.crash_synopsis() eipoff = self.crash.find("EIP") eaxoff = self.crash.find("EAX") self.eip = self.crash[eipoff+5:eaxoff-3] eipname = self.crash[eipoff+5:eaxoff+13] print "EIP = ",self.eip fd3 = open("D:\\fuzzing\\crashes.txt", "a") fd3.write(self.eip) fd3.write(" iteration : %s ext : %s\n" % (self.iteration,self.ext)) crash_fd = open("D:\\fuzzing\\crashes\\crash-%s [ %d ].txt" % (eipname, self.iteration), "w+") crash_fd.write("=============== utils log ===============\n\n") crash_fd.write(self.crash) crash_fd.write("============ mutate_key log ============\n\n") crash_fd.write("%s " % self.mutate_key) crash_fd.write("\n\n END \n\n") shutil.copy(self.copyfile ,"D:\\fuzzing\\crashes\\crash-%s [ %d ].%s" % (eipname, self.iteration, self.ext)) fd3.close() crash_fd.close() self.dbg.terminate_process() self.in_accessv_handler = False return DBG_EXCEPTION_NOT_HANDLED def mutate_file( self ): fd = open(self.copyfile, "rb") stream = fd.read() fd2 = open(self.copyfile, "wb") fd2.write(stream) stream_length = len(stream) attack_strs = [ "\x00", "\x0d", "\x0a", "\xff"] for i in range(self.mutate_count): rand_offset = random.randint(0, stream_length - 1 ) self.mutate_key[rand_offset] = {hex(ord(stream[rand_offset:rand_offset+1] ) ) } attack_str = random.choice(attack_strs) fd2.seek(rand_offset) fd2.write(attack_str) fd.close() fd2.close() return print "[ * ] Simple Fuzzer " fuzzer = file_fuzzer(exe_path) fuzzer.fuzz() | cs |
