CVE-2025-62203

Description

Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code locally.

CVSS Details

CVSS Score

7.8

Severity

HIGH

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x64:* - VULNERABLE

cpe:2.3:a:microsoft:365_apps:-:*:*:*:enterprise:*:x86:* - VULNERABLE

cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x64:* - VULNERABLE

cpe:2.3:a:microsoft:excel:2016:*:*:*:*:*:x86:* - VULNERABLE

cpe:2.3:a:microsoft:office:2019:*:*:*:*:*:x64:* - VULNERABLE

Microsoft Office Excel 2016 (32-bit and 64-bit Editions)

Microsoft Office Excel 2019 (32-bit and 64-bit Editions)

Microsoft 365 Apps for Enterprise

Microsoft Office for Mac 2019

Microsoft 365 for Mac

具体版本范围需参考微软官方安全公告

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

// CVE-2025-62203 PoC - Malicious Excel File Generator
// This PoC demonstrates the concept of triggering UAF in Excel
// Note: Actual exploit requires specific trigger conditions

import struct
import zipfile
import os

def create_malicious_excel(output_path):
    """
    Generate a PoC Excel file that may trigger UAF in vulnerable Excel versions
    This is a conceptual PoC - actual trigger conditions vary
    """
    
    # Excel file structure (simplified)
    malicious_file = {
        '[Content_Types].xml': '''<?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>''',
        
        '_rels/.rels': '''<?xml version="1.0" encoding="UTF-8"?>
<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>''',
        
        'xl/workbook.xml': '''<?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>''',
        
        'xl/_rels/workbook.xml.rels': '''<?xml version="1.0" encoding="UTF-8"?>
<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>''',
        
        'xl/worksheets/sheet1.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>UAF_TRIGGER_FORMULA</f>
        <v>Payload</v>
      </c>
    </row>
    <!--
    PoC trigger conditions:
    1. Complex formula structures that cause memory allocation
    2. Specific cell references that trigger object reuse
    3. Large data sets that cause heap operations
    -->
  </sheetData>
</worksheet>'''
    }
    
    # Create the Excel file (which is a ZIP archive)
    with zipfile.ZipFile(output_path, 'w', zipfile.ZIP_DEFLATED) as xlsx:
        for filename, content in malicious_file.items():
            xlsx.writestr(filename, content)
    
    print(f"[+] PoC Excel file created: {output_path}")
    print("[+] This file is designed to trigger UAF in vulnerable Excel versions")
    print("[!] Note: Actual trigger requires specific conditions based on Excel version")

if __name__ == "__main__":
    create_malicious_excel("CVE-2025-62203-poc.xlsx")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2025-62203
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2025-62203
[3] CVE Details https://www.cvedetails.com/cve/CVE-2025-62203/
[4] VulDB https://vuldb.com/cve/CVE-2025-62203
[5] https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62203

Raw JSON Data

JSON

{"cve": {"id": "CVE-2025-62203", "sourceIdentifier": "[email protected]", "published": "2025-11-11T18:15:43.970", "lastModified": "2025-11-17T18:01:46.200", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Microsoft Office Excel allows an unauthorized attacker to execute code 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:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "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-2025-62203", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}