From the course: Ethical Hacking: Denial of Service

Unlock the full course today

Join today to access over 22,400 courses taught by industry experts or purchase this course individually.

Using NTP to amplify attacks

Using NTP to amplify attacks

From the course: Ethical Hacking: Denial of Service

Start my 1-month free trial

Using NTP to amplify attacks

- [Narrator] A reflection attack takes place when we send a packet to a server, and have it reply, not to us, but to the target. We can achieve this easily by spoofing the source address in the packet. An amplification attack takes place when we send a packet to a server and get a significantly larger packet sent back to the target in reply. Both reflection and amplification attacks typically involve sending packets to many thousands of servers in a distributed denial-of-service attack. Let's have a look at the basics of an NTP attack. I'll start by looking at the Ubuntu server, which I have on the virtual network running the NTP service. I can check what services are running in Ubuntu by entering the command service --status-all more. We can see the NTP server is shown with a plus. It's running. Okay, Let's see how it's configured. This shows me that the service is running and it's connected to four authoritative time servers. Okay, we have a service here. Before I go, I'll open up…

Contents