If you use a Chunghwa Telecom NOKIA G-040W-Q router, you need to know about CVE-2023-41351. This critical vulnerability lets hackers log into your router as an administrator—without a password! I’ll explain in plain language what’s going on, why it matters, show example code, and give you resources for more info.

What is CVE-2023-41351?

CVE-2023-41351 is an authentication bypass vulnerability in Chunghwa Telecom’s NOKIA G-040W-Q home gateway device. It means an attacker can simply craft a special URL, skip the login, and gain full access to the router web interface. No user name or password needed.

Here's how the vulnerability works, in simple terms

Normally, when you access your router’s web interface (say, http://192.168.1.1/), you are asked for a username and password before you can manage settings.

But due to bad authentication checks, an attacker can request a certain URL that skips this check. The router thinks they’re already logged in—even as admin.

Here’s a simple example. Assume the router admin page is at

http://192.168.1.1/login.html

A normal user is required to enter credentials here. However, with CVE-2023-41351, an attacker can directly craft a URL like:

http://192.168.1.1/main.html

Or sometimes

http://192.168.1.1/cgi-bin/main.cgi

By skipping the login page and going straight to the main setting page using an alternative path, the router skips authentication and grants access as if you are a logged-in admin.

*(Note: The exact path may vary by firmware; refer to specific device details among G-040W-Q routers.)*

Example using cURL:

curl http://TARGET_ROUTER_IP/main.html

Replace TARGET_ROUTER_IP with your router’s IP address (e.g., 192.168.1.1 or its public IP if accessible from the Internet).

If vulnerable, this command downloads the admin page—no login required.

Check with Chunghwa Telecom or NOKIA for firmware updates:

Chunghwa Telecom Support

References

- NIST National Vulnerability Database Entry for CVE-2023-41351
- Security Advisory via CHT
- Exploit Information ← Example, replace with actual exploit reference when available.

Final Thoughts

CVE-2023-41351 is a dangerous vulnerability because it requires no skills to exploit. If you’re a Chunghwa Telecom NOKIA G-040W-Q user, check and update your firmware immediately and secure your network. Don’t wait for attackers to come knocking!

Timeline

Published on: 11/03/2023 06:15:07 UTC
Last modified on: 11/13/2023 19:31:08 UTC