![]() There have been a number of well-known SYN flood attacks on web servers. The client responds with the ACK flag set. The server allocates resources for the client and then responds with the SYN and ACK flags set. The client sends a packet with the SYN flag set. This process, called a three-way handshake, is summarized as follows: The client machine is then supposed to respond with an ACK flag set. The server allocates appropriate resources and then sends to the client a packet with both the SYN (synchronize) and ACK (acknowledge) flags set. (SYN is short for synchronize.) This packet is asking the target server to synchronize communications. When a session is initiated between a client and a server in a network using TCP, a packet is sent to the server with a 1-bit flag called a SYN flag set. ![]() This particular type of attack depends on the hacker’s knowledge of how connections to a server are made. TCP SYN Flood AttacksĪ TCP SYN flood attack is an older type of DoS attack, but it illustrates the concepts of denial of service quite well. Objective For the CEH exam, make certain you know the categories of attacks as well as how the magnitude is measured for each category. The magnitude of a protocol attack is measured in packets per second (pps). ![]() Exploiting such vulnerabilities can cause a system to become unresponsive. It can detect a range of DoS attacks.Ī protocol attack tries to exploit some vulnerability in the protocol being used. SPI (stateful packet inspection) looks at not just the individual packet but all the packets that came before it in the session. Slowloris involves partial HTTP requests.Ī. What type of attack is Todd concerned about?īy detecting anomalies in the stream such as too many SYN packets from the same IP sourceīy blocking fake IP addresses and sending their traffic to a black holeīy carefully examining each packet and tracing back its originīy encrypting traffic, preventing many attacksī. He is particularly worried about attacks that used malformed ICMP packets. Todd is concerned about DoS attacks against his network. In this attack, the message body is sent quite slowly. Sharia has detected an attack on her company web server. If you are in any doubt at all, read everything in this chapter. If you can correctly answer these CramSaver questions, save time by skimming the Exam Alerts in this section and then completing the Cram Quiz at the end of the section.
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