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How CVE-2025-0445 Works
This vulnerability occurs in Chrome’s V8 JavaScript engine due to improper memory management. A use-after-free (UAF) flaw allows attackers to craft malicious HTML pages that manipulate freed memory pointers in V8’s heap. When garbage collection prematurely deallocates an object but the renderer process continues referencing it, heap corruption can be triggered. This enables arbitrary code execution within the browser context. The exploit involves chaining JavaScript operations to maintain dangling pointers while forcing garbage collection cycles.
DailyCVE Form
Platform: Google Chrome
Version: < 133.0.6943.53
Vulnerability: Use-After-Free
Severity: High
Date: 04/08/2025
What Undercode Say:
Exploitation Analysis
1. Crafted HTML invokes vulnerable V8 functions.
2. JavaScript retains freed object references.
3. Garbage collector fails to sanitize pointers.
4. Heap spray allocates attacker-controlled data.
Protection Commands
Update Chrome sudo apt update && sudo apt upgrade google-chrome-stable Verify version google-chrome --version | grep "133.0.6943.53" Enable Chrome sandboxing chrome://flags/enable-sandbox
Debugging Code
// Crash PoC
let arr = new ArrayBuffer(0x1000);
function triggerUAF() {
let freedObj = new VulnerableClass();
freedObj.cleanup();
setTimeout(() => {
freedObj.use(); // UAF here
}, 500);
}
Mitigation Script
Check Chrome extensions for malicious code
import os
EXT_PATH = "/home//.config/google-chrome//Extensions/"
for ext in os.listdir(EXT_PATH):
if "eval(" in open(EXT_PATH+ext).read():
print(f"Malicious extension: {ext}")
Network Protection
iptables -A OUTPUT -p tcp --dport 443 -m string --algo bm --string "exploit.js" -j DROP
Memory Analysis
gdb -p $(pidof chrome) -ex "x/20x &v8_heap_corruption" -batch
Registry Check (Windows)
reg query HKEY_LOCAL_MACHINE\SOFTWARE\Google\Chrome\BLBeacon /v version
References:
Reported By: https://nvd.nist.gov/vuln/detail/CVE-2025-0445
Extra Source Hub:
Undercode
