Advanced Security Research Platform

Bedrock Server Security
Mastery Guide

From reconnaissance to exploitation to defense — the complete technical knowledge base for understanding every vulnerability in Minecraft Bedrock Edition servers, RakNet protocol, and shared hosting platforms like Aternos.

0 Vulnerabilities Documented

0 Attack Vectors

0 Defense Strategies

0 Custom Tools

PHASE 01

Reconnaissance & OSINT

The foundation of any security assessment — understanding your target before touching a single packet.

Port Scanning & Service Detection

Bedrock servers use UDP port 19132 by default. Advanced scanning reveals server software, version, MOTD, player count, and protocol version — all without authentication.

Terminal / Nmap
# Basic Bedrock server scan
$ nmap -sU -p 19132 --script=minecraft-info target.aternos.me

# Full port range scan for non-standard ports
$ nmap -sU -p 1-65535 --min-rate=1000 target.aternos.me

# Aggressive service detection
$ nmap -sUV -p 19132-19135 -A --version-intensity 9 target.aternos.me

# Scan multiple Aternos servers
$ nmap -sU -p 19132 -iL aternos_targets.txt --open

Info Disclosure Version Leak

OSINT & Target Profiling

Gathering intelligence from public sources: DNS records, Shodan, social media, Discord servers, and Aternos public server listings reveal critical infrastructure details.

OSINT Commands
# Shodan search for Bedrock servers
$ shodan search "MCPE" --fields ip_str,port,data

# DNS enumeration for Aternos subdomains
$ dig +short A servername.aternos.me
$ host -t SRV _minecraft._udp.target.com

# Reverse IP lookup
$ curl "https://api.shodan.io/shodan/host/{IP}?key=API_KEY"

# Check Aternos server status via API
$ curl -s "https://mcapi.us/server/status?ip=server.aternos.me&port=19132"

OSINT Passive Recon

Unconnected Ping — The Information Goldmine

Sending a single RakNet Unconnected Ping (0x01) packet to port 19132 returns a treasure trove of information without any authentication.

Python / RakNet Ping
import socket, struct, time

def raknet_ping(host, port=19132):
    # RakNet Unconnected Ping packet (ID: 0x01)
    packet  = b'\x01'                         # Packet ID
    packet += struct.pack('>q', int(time.time() * 1000))  # Timestamp
    packet += b'\x00\xff\xff\x00\xfe\xfe\xfe'  # Magic bytes
    packet += b'\xfe\xfd\xfd\xfd\xfd\x12\x34\x56\x78'
    packet += struct.pack('>q', 0)             # Client GUID

    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.settimeout(5)
    sock.sendto(packet, (host, port))

    try:
        data, addr = sock.recvfrom(4096)
        # Parse Unconnected Pong (0x1C)
        if data[0] == 0x1C:
            info = data[35:].decode('utf-8')
            fields = info.split(';')
            return {
                'edition': fields[0],
                'motd': fields[1],
                'protocol': fields[2],
                'version': fields[3],
                'players': fields[4],
                'max_players': fields[5],
                'server_id': fields[6],
                'map': fields[7],
                'gamemode': fields[8],
            }
    except socket.timeout:
        return None

result = raknet_ping("target.aternos.me")
print(result)

Response Fields Breakdown:

Field	Information	Risk Level
Edition	MCPE / MCEE	Low
MOTD	Server name / description	Low
Protocol Version	Exact version number	Medium
Game Version	1.21.x etc.	Medium
Player Count	Online / Max	Low
Server GUID	Unique identifier	High
Map Name	World name	Low
Gamemode	Survival/Creative	Low
Port (v6)	IPv6 port exposed	Medium

PHASE 02

RakNet Protocol Deep Dive

Understanding every byte of the Bedrock networking protocol — the backbone of all attacks and defenses.

Unconnected
Ping (0x01)

Unconnected
Pong (0x1C)

Open Connection
Request 1

Open Connection
Reply 1

Game
Session

RakNet Connection Handshake

The 4-step RakNet handshake is the gateway. Understanding each packet allows interception, replay attacks, and session manipulation.

Python / Connection Handshake
import socket, struct

RAKNET_MAGIC = (
    b'\x00\xff\xff\x00\xfe\xfe\xfe\xfe'
    b'\xfd\xfd\xfd\xfd\x12\x34\x56\x78'
)

def open_connection_request_1(host, port=19132):
    """
    Packet 0x05 — Open Connection Request 1
    This initiates the MTU size negotiation
    """
    packet  = b'\x05'              # Packet ID
    packet += RAKNET_MAGIC         # 16 bytes magic
    packet += b'\x0b'              # Protocol version (11)
    # Padding for MTU discovery (1464 bytes typical)
    packet += b'\x00' * (1464 - len(packet))

    sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    sock.settimeout(5)
    sock.sendto(packet, (host, port))

    data, _ = sock.recvfrom(4096)
    if data[0] == 0x06:  # Open Connection Reply 1
        server_guid = struct.unpack('>q', data[1:9])[0]
        use_security = data[9]
        mtu_size = struct.unpack('>H', data[10:12])[0]
        print(f"Server GUID: {server_guid}")
        print(f"Security: {use_security}")
        print(f"MTU Size: {mtu_size}")
        return server_guid, mtu_size
    return None

Session Hijacking MTU Manipulation

RakNet Packet Structure

Every RakNet packet follows a specific binary structure. Understanding the byte layout is essential for crafting custom packets and fuzzing.

Packet ID	Name	Dir

Bedrock Server SecurityMastery Guide