In this question, you will help Mallory develop new ways to conduct denial-of-service (DoS) attacks. (1) CHARGEN and ECHO are services provided by some UNIX servers. For every UDP packet arriving at port 19, CHARGEN sends back a packet with 0 to 512 random characters. For every UDP packet arriving at port 7, ECHO sends back a packet with the same content.Mallory wants to perform a DoS attack on two servers. One with IP address M supports CHARGEN, and another with IP address N supports ECHO. Mallory can spoof IP addresses.Is it possible to create a single UDP packet with no content which will cause both servers to consume a large amount of bandwidth? If yes, describe the header (i.e., source IP, destination IP, source port, and destination port) of your UDP package; otherwise, explain why?Assume now that CHARGEN and ECHO are now modified to only respond to TCP packets (post-handshake) and not UDP. Is it possible to create a single TCP SYN packet with no content which will cause both servers to consume a large amount of bandwidth? If yes, describe the header (i.e., source IP, destination IP, source port, and destination port) of your UDP package; otherwise, explain why?(2) A typical web server maintains a connection after receiving each TCP connection request. Write down the name of the transport layer attack that can cause denial-of-service on the web server which works by consuming a large amount of server memory.

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Answered: In this question, you will help Mallory…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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In this question, you will help Mallory develop new ways to conduct denial-of-service (DoS) attacks.

(1) CHARGEN and ECHO are services provided by some UNIX servers. For every UDP packet arriving at port 19, CHARGEN sends back a packet with 0 to 512 random characters. For every UDP packet arriving at port 7, ECHO sends back a packet with the same content.

Mallory wants to perform a DoS attack on two servers. One with IP address M supports CHARGEN, and another with IP address N supports ECHO. Mallory can spoof IP addresses.

Is it possible to create a single UDP packet with no content which will cause both servers to consume a large amount of bandwidth? If yes, describe the header (i.e., source IP, destination IP, source port, and destination port) of your UDP package; otherwise, explain why?
Assume now that CHARGEN and ECHO are now modified to only respond to TCP packets (post-handshake) and not UDP. Is it possible to create a single TCP SYN packet with no content which will cause both servers to consume a large amount of bandwidth? If yes, describe the header (i.e., source IP, destination IP, source port, and destination port) of your UDP package; otherwise, explain why?

(2) A typical web server maintains a connection after receiving each TCP connection request. Write down the name of the transport layer attack that can cause denial-of-service on the web server which works by consuming a large amount of server memory.

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