Sybex CEH Certified Ethical Hacker Version 8 Study Guide

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264 Chapter 11 ■ Denial of Service Fraggle A fraggle attack is a variation of a smurf attack that uses UDP echo requests instead of ICMP. It still uses an intermediary for amplification. Commonly a fraggle attack targets the UDP echo requests to the chargen (character generator) port of the intermediary systems via a broadcast request. Just as in a smurf attack, the attacker spoofs the victim’s IP address as the source. Each client that receives the echo to the chargen port will in turn generate a character to be sent to the victim. Once it’s received, the victim machine will echo back to the intermediary’s chargen port, thus restarting the cycle. Land A land attack sends traffic to the target machine with the source spoofed as the target machine itself. The victim attempts to acknowledge the request repeatedly with no end. Permanent DoS Attacks Most DoS attacks are temporary and only need to be stopped and any mess they created cleaned up to put everything back the way it was. However, some types of DoS attacks destroy a system and cause it to become permanently offline. Phlashing is a form of permanent DoS that involves pushing bogus or incorrect updates to a system’s firmware to a victim’s system. When this is done, the hardware becomes unusable in many cases without being replaced. When a system is attacked in such a manner, it is said to be bricked. In other words, it is worthless as a computer and now is a brick. Application-level Attacks Application-level attacks are those that result in a loss or degradation of a service to the point it is unusable. These attacks can even result in the corruption or loss of data on a system. Typically these types of attacks take the form of one of the following: Flood This attack overwhelms the target with traffic to make it difficult or impossible to respond to legitimate requests. Disrupt This attack usually involves attacking a system with the intention of locking out or blocking a user or users—for example, attempting to log into a system several times to lock up the account so that the legitimate user cannot use it. Jam In this attack, typically the attacker is crafting SQL queries to lock up or corrupt a database. We’ll discuss jam attacks in Chapter 14, “SQL Injections.” See Exercise 11.1 on how to perform a SYN flood. EXERCISE 11.1 Performing a SYN Flood Let’s go through a quick example of a SYN flood attack using hping3. Hping3 is a Linux utility used to craft custom packets such as packets that have specific flags activated. Refer to Chapter 5, “Scanning Networks,” for a review of TCP flags. Let’s get started.
Understanding DoS 265 1. You’ll monitor your traffic via your Wireshark installation on your Windows 7 installation. Your Windows 7 box will also be your target unit. First get the sniffer started. 2. Once you have your monitoring system sniffing the wire and your target system ready to be flooded, you can start the flood via your BackTrack box. Open a new terminal window and take a look at the main page for hping3.
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CEHv8 Certified Ethical Hacker Vers
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Senior Acquisitions Editor: Jeff Ke
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Acknowledgments First, I would like
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Contents at a Glance Introduction A
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xii Contents Chapter 3 Cryptography
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xiv Contents Commonly Exploited Ser
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xvi Contents Chapter 11 Denial of S
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xviii Contents Securing the Physica
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Introduction If you’re preparing
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Introduction xxiii How to Become a
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Introduction xxv Tips for Taking th
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Introduction xxvii 4. Answer all of
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Introduction xxix Network/wireless
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Assessment Test xxxi C. PPP D. SLIP
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Assessment Test xxxiii 19. An indiv
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Assessment Test xxxv 31. Which of t
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Answers to Assessment Test xxxvii 1
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CEHv8 Certified Ethical Hacker Vers
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In this book you will learn the var
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4 Chapter 1 ■ Getting Started wit
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10 Chapter 1 ■ Getting Started wi
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Every skill set comes with a histor
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28 Chapter 2 ■ System Fundamental
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This chapter covers cryptography, a
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58 Chapter 3 ■ Cryptography The p
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60 Chapter 3 ■ Cryptography ■
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62 Chapter 3 ■ Cryptography MARS
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64 Chapter 3 ■ Cryptography A has
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66 Chapter 3 ■ Cryptography The C
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68 Chapter 3 ■ Cryptography Under
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70 Chapter 3 ■ Cryptography TABLE
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72 Chapter 3 ■ Cryptography 5. On
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74 Chapter 3 ■ Cryptography PGP w
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76 Chapter 3 ■ Cryptography Revie
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78 Chapter 3 ■ Cryptography 13. W
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Chapter 4 Footprinting and Reconnai
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Understanding the Steps of Ethical
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What Is Footprinting? 85 Goals of t
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Terminology in Footprinting 87 Orga
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The Footprinting Process 89 Using S
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The Footprinting Process 91 Locatio
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The Footprinting Process 93 will no
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The Footprinting Process 95 In secu
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Exam Essentials 97 I want to introd
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Review Questions 99 7. Which of the
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Review Questions 101 19. Footprinti
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Once you’ve completed the footpri
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106 Chapter 5 ■ Scanning Networks
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You’ve gathered a lot of informat
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130 Chapter 6 ■ Enumeration of Se
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Using the information gathered so f
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154 Chapter 7 ■ Gaining Access to
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Chapter 8 Trojans, Viruses, Worms,
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Malware 181 In past decades, what w
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Malware 183 The Patriot Act This ac
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Malware 185 1. Design. The author e
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Malware 187 ■ ■ Macro viruses d
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Malware 189 How to Create a Virus C
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Malware 191 A Closer Look at Slamme
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Malware 193 ■ ■ Freeware—Down
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Malware 195 Operations that could b
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Malware 197 ■ NetMeeting Remote:
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Malware 199 Tools for Creating Troj
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Malware 201 5. In the next screen,
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Overt and Covert Channels 203 ■ P
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Exam Essentials 205 ■ ■ ■ ■
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Review Questions 207 7. Which utili
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Chapter 9 Sniffers CEH EXAM OBJECTI
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Understanding Sniffers 211 When on
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Page 279 and 280: What Is Social Engineering? 237 If
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Exploring the Client-Server Relatio
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Exam Essentials 323 Summary This ch
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Review Questions 325 7. In the fiel
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Review Questions 327 19. What may b
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This chapter covers SQL injection,
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332 Chapter 14 ■ SQL Injection SE
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334 Chapter 14 ■ SQL Injection Al
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336 Chapter 14 ■ SQL Injection Ru
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338 Chapter 14 ■ SQL Injection If
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340 Chapter 14 ■ SQL Injection On
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342 Chapter 14 ■ SQL Injection In
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344 Chapter 14 ■ SQL Injection
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346 Chapter 14 ■ SQL Injection 7.
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Chapter 15 Wireless Networking CEH
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What Is a Wireless Network? 351 ■
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What Is a Wireless Network? 353 nam
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What Is a Wireless Network? 355 Som
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What Is a Wireless Network? 357 ■
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What Is a Wireless Network? 359 Cra
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What Is a Wireless Network? 361 Wha
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What Is a Wireless Network? 363 Mis
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What Is a Wireless Network? 365 Als
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Summary 367 ■ ■ ■ An attacker
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Review Questions 369 Review Questio
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Review Questions 371 14. Bluejackin
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At this point in this book you have
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376 Chapter 16 ■ Evading IDSs, Fi
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Chapter 17 Physical Security CEH EX
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Introducing Physical Security 395 O
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Introducing Physical Security 397 s
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Introducing Physical Security 399 P
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Introducing Physical Security 401 S
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Introducing Physical Security 403 e
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Introducing Physical Security 405 a
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Introducing Physical Security 407 V
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Exam Essentials 409 opening 18 feet
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Review Questions 411 7. Which of th
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Review Questions 413 19. What mecha
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416 Appendix A ■ Answers to Revie
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438 Appendix B ■ About the Additi
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440 Appendix B ■ About the Additi
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442 ARP (Address Resolution Protoco
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444 Counter Mode with Cipher Block
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446 EIP (Extended Instruction Point
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448 Google Hacking Database (GHDB)
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450 IP DHCP Snooping feature - Limi
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452 mirrors, port - networks mirror
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454 passwords - ports passwords cha
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456 Remote Encrypted Callback Unix
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458 sniffers - stateful multilayer
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460 Teflon Oil Patch program - unpr
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462 webservers and web applications
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ee Online Study Tools FRegister on
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