Hack I.T.: Security Through Penetration Testing

Chapter 6. Dial-In Penetration

This chapter is dedicated to one of the oldest methods of gaining unauthorized access to target systems: dial-in penetration over telephone lines. While this is no longer the primary means of gaining access, dial-in vulnerabilities remain one of the most common weaknesses in networks today. Insecurely configured modems listening for a connection from anywhere represent a significant vulnerability. We identify listening modems by using mass-dialing software to dial blocks of phone numbers owned by an organization. This is more commonly called war dialing.

War Dialing

Through war dialing, we are looking for a modem connected to a telephone line that is listening for incoming connections. These modems can be a part ...