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How to Hack an Ethernet ADSL Router

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Every router comes with a username and password using which it is possible to gain access to the router settings and configure the device. The vulnerability actually lies in the Default username and password that comes with the factory settings. Usually the routers come preconfigured from the Internet Service provider and hence the users do not bother to change the password later.
This makes it possible for the attackers to gain unauthorized access to the router and modify its settings using a common set of default usernames and passwords. Here is how you can do it. Before you proceed, you need the following tool in the process:

Hacking the ADSL Router:

Here is a detailed information on how to exploit the vulnerability of an ADSL router:
  1. Go to whatismyipaddress.com. Once the page is loaded, you will find your IP address. Note it down.
  2. Open Angry IP Scanner, here you will see an option called IP Range: where you need to enter the range of IP address to scan for.
    3. Suppose your IP is 117.192.195.101, you can set the range something as 117.192.194.0 to 117.192.200.255so that there exists at least 200-300 IP addresses in the range.
  3. Go to Tools->Preferences and select the Ports tab. Under Port selection enter 80 (we need to scan for port 80). Now switch to the Display tab, select the option “Hosts with open ports only” and click on OK.
    4. IP Scanner Settings
    I have used Angry IP Scanner v3.0 beta-4. If you are using a different version, you need to Go to Optionsinstead of Tools
  4. Now click on Start. After a few minutes, the IP scanner will show a list of IPs with Port 80 open as shown in the below image:
    5. Angry IP Scanner
  5. Now copy any of the IP from the list, paste it in your browser’s address bar and hit enter. A window will popup asking for username and password. Since most users do not change the passwords, it should most likely work with the default username and password. For most routers the default username-passwordpair will be admin-admin or admin-password.
Just enter the username-password as specified above and hit enter. If you are lucky you should gain access to the router settings page where you can modify any of the router settings. The settings page can vary from router to router. A sample router settings page is shown below:
Router Settings Page Hacked!
If you do not succeed to gain access, select another IP from the list and repeat the step-5. At least 1 out of 5 IPs will have a default password and hence you will surely be able to gain access.

What can a Hacker do by Gaining Access to the Router Settings?

By gaining access to the router settings, it is possible for an attacker to modify any of the router settings which results in the malfunction of the router. As a result the target user’s computer will be disconnected from the Internet. In the worst case the attacker can copy the ISP login details from the router to steal the Internet connection or even hijack the DNS by pointing it at a rouge DNS server. If this happens, the victim will have to reconfigure/reset the router settings in order to bring it back to normal.

The Verdict:

If you are using an ADSL router to connect to the Internet, it is highly recommended that you immediately change your password to prevent any such attacks in the future. Who knows, you may be the next victim of such an attack.
Since the configuration varies from router to router, you need to contact your ISP for details on how to change the password for your model.
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