CompTIA Security+ Guide to Network Security Fundamentals PDF

INFORMATION SECURITY Security+ Guide to Network Security Fundamentals Sixth Edition Mark Ciampa Copyright 2018 Cengage Learning. All Rights Re...

INFORMATION SECURITY Security+ Guide to Network Security Fundamentals Sixth Edition Mark Ciampa Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  CompTIA Security+ SY0-501 Exam Objectives Security+ Exam Domain/Objectives Chapter Bloom’s Taxonomy 1.0: Threats, Attacks, and Vulnerabilities 1.1 G  iven a scenario, analyze indicators of compromise and determine the type of 2 Analyze malware. 1.2 C  ompare and contrast types of attacks. 2 Understand 3 Analyze 5 Understand 8 Apply/Understand 11 Create 15 Apply 1.3 E  xplain threat actor types and attributes. 1 Analyze/Apply 1.4 E  xplain penetration testing concepts. 13 Apply 1.5 E  xplain vulnerability scanning concepts. 13 Apply 1.6 E  xplain the impact associated with types of vulnerabilities. 1 Understand 3 Understand 4 Understand 5 Understand 9 Understand 10 Understand 2.0: Technologies and Tools 2.1 Install and configure network components, both hardware- and software-based, 4 Apply to support organizational security. 6 Analyze 7 Apply 8 Analyze/Evaluate 2.2 G  iven a scenario, use appropriate software tools to assess the security posture of 8 Evaluate an organization. 13 Analyze/Evaluate 14 Evaluate 2.3 G  iven a scenario, troubleshoot common security issues. 15 Analyze 2.4 G  iven a scenario, analyze and interpret output from security technologies. 6 Analyze 7 Analyze 9 Analyze 2.5 G  iven a scenario, deploy mobile devices securely. 8 Apply/Evaluate 10 Analyze/Create 11 Analyze 2.6 G  iven a scenario, implement secure protocols. 4 Apply 5 Analyze 3.0: Architecture and Design 3.1 E  xplain use cases and purpose for frameworks, best practices and secure 1 Analyze configuration guides. 15 Understand 3.2 Given a scenario, implement secure network architecture concepts. 6 Analyze 7 Apply 8 Apply/Evaluate 13 Apply Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  INFORMATION SECURITY Sixth Edition CompTIA ® SECURITY+ GUIDE TO NETWORK SECURITY FUNDAMENTALS Mark Ciampa, Ph.D. Australia Brazil Mexico Singapore United Kingdom United States Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  Security+ Guide to Network © 2018, 2015 Cengage Learning Security ­Fundamentals, Sixth Unless otherwise noted, all content is © Cengage. Edition ALL RIGHTS RESERVED. No part of this work covered by the copy- Mark Ciampa right herein may be reproduced or distributed in any form or by any means, except as permitted by U.S. copyright law, without the prior written permission of the copyright owner. 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Cengage is an independent entity from Microsoft Corporation and not a ­ ffiliated with Microsoft in any manner. ­ Printed in the United States of America Print Number: 01 Print Year: 2017 Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  Brief Contents INTRODUCTION.............................................................................................xv PART 1 SECURITY AND ITS THREATS 1 CHAPTER 1 Introduction to Security 3 CHAPTER 2 Malware and Social Engineering Attacks 51 PART 2 CRYPTOGRAPHY 97 CHAPTER 3 Basic Cryptography 99 CHAPTER 4 Advanced Cryptography and PKI 145 PART 3 NETWORK ATTACKS AND DEFENSES 189 CHAPTER 5 Networking and Server Attacks 191 CHAPTER 6 Network Security Devices, Design, and Technology 233 CHAPTER 7 Administering a Secure Network 281 CHAPTER 8 Wireless Network Security 321 PART 4 DEVICE SECURITY 371 CHAPTER 9 Client and Application Security 373 iii Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203 iv Brief Contents CHAPTER 10 Mobile and Embedded Device Security 421 PART 5 IDENTITY AND ACCESS MANAGEMENT 469 CHAPTER 11 Authentication and Account Management 471 CHAPTER 12 Access Management 521 PART 6 RISK MANAGEMENT 563 CHAPTER 13 Vulnerability Assessment and Data Security 565 CHAPTER 14 Business Continuity 607 CHAPTER 15 Risk Mitigation 651 APPENDIX A CompTIA SY0-501 Certification Exam Objectives 691 GLOSSARY 713 INDEX 741 Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  Table of Contents INTRODUCTION...........................................................................................................xv PART 1 SECURITY AND ITS THREATS 1 CHAPTER 1 Introduction to Security............................................................3 Challenges of Securing Information................................................................... 8 Today’s Security Attacks.....................................................................................8 Reasons for Successful Attacks.........................................................................12 Difficulties in Defending Against Attacks........................................................ 14 What Is Information Security?........................................................................... 17 Understanding Security.....................................................................................18 Defining Information Security..........................................................................18 Information Security Terminology...................................................................21 Understanding the Importance of Information Security................................. 24 Who Are the Threat Actors?............................................................................... 28 Script Kiddies.................................................................................................... 29 Hactivists.......................................................................................................... 29 Nation State Actors...........................................................................................30 Insiders.............................................................................................................30 Other Threat Actors...........................................................................................31 Defending Against Attacks................................................................................ 32 Fundamental Security Principles..................................................................... 32 Frameworks and Reference Architectures....................................................... 35 Chapter Summary............................................................................................... 35 Key Terms............................................................................................................ 37 Review Questions............................................................................................... 37 Case Projects....................................................................................................... 46 CHAPTER 2 Malware and Social Engineering Attacks..............................51 Attacks Using Malware....................................................................................... 53 Circulation........................................................................................................ 55 Infection............................................................................................................ 61 v Copyright 2018 Cengage Learning. 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WCN 02-200-203 vi Table of Contents Concealment..................................................................................................... 65 Payload Capabilities..........................................................................................66 Social Engineering Attacks................................................................................. 73 Psychological Approaches................................................................................ 74 Physical Procedures..........................................................................................80 Chapter Summary............................................................................................... 82 Key Terms............................................................................................................ 84 Review Questions............................................................................................... 84 Case Projects....................................................................................................... 92 PART 2 CRYPTOGRAPHY 97 CHAPTER 3 Basic Cryptography..................................................................99 Defining Cryptography..................................................................................... 101 What Is Cryptography?....................................................................................101 Cryptography and Security............................................................................. 105 Cryptography Constraints................................................................................107 Cryptographic Algorithms................................................................................ 108 Hash Algorithms..............................................................................................110 Symmetric Cryptographic Algorithms............................................................ 113 Asymmetric Cryptographic Algorithms 116 Cryptographic Attacks...................................................................................... 123 Algorithm Attacks............................................................................................ 123 Collision Attacks.............................................................................................. 125 Using Cryptography.......................................................................................... 126 Encryption through Software.......................................................................... 127 Hardware Encryption......................................................................................128 Chapter Summary............................................................................................. 130 Key Terms.......................................................................................................... 132 Review Questions............................................................................................. 133 Case Projects..................................................................................................... 142 CHAPTER 4 Advanced Cryptography and PKI.........................................145 Implementing Cryptography........................................................................... 147 Key Strength.....................................................................................................147 Secret Algorithms............................................................................................148 Copyright 2018 Cengage Learning. 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WCN 02-200-203  Table of Contents vii Block Cipher Modes of Operation.................................................................. 149 Crypto Service Providers................................................................................ 150 Algorithm Input Values................................................................................... 151 Digital Certificates............................................................................................ 152 Defining Digital Certificates............................................................................. 152 Managing Digital Certificates..........................................................................154 Types of Digital Certificates.............................................................................158 Public Key Infrastructure (PKI)........................................................................ 165 What Is Public Key Infrastructure (PKI)?........................................................ 166 Trust Models................................................................................................... 166 Managing PKI...................................................................................................168 Key Management............................................................................................. 171 Cryptographic Transport Protocols................................................................ 174 Secure Sockets Layer (SSL)............................................................................... 174 Transport Layer Security (TLS)........................................................................ 175 Secure Shell (SSH)............................................................................................176 Hypertext Transport Protocol Secure (HTTPS)................................................176 Secure/Multipurpose Internet Mail Extensions (S/MIME)............................. 177 Secure Real-time Transport Protocol (SRTP)................................................... 177 IP Security (IPsec)............................................................................................ 177 Chapter Summary............................................................................................. 179 Key Terms.......................................................................................................... 181 Review Questions............................................................................................. 181 Case Projects..................................................................................................... 187 PART 3 NETWORK ATTACKS AND DEFENSES 189 CHAPTER 5 Networking and Server Attacks...........................................191 Networking-Based Attacks.............................................................................. 193 Interception.....................................................................................................194 Poisoning........................................................................................................ 196 Server Attacks................................................................................................... 201 Denial of Service (DoS)....................................................................................201 Web Server Application Attacks..................................................................... 203 Hijacking.........................................................................................................209 Overflow Attacks............................................................................................. 213 Advertising Attacks.......................................................................................... 215 Browser Vulnerabilities...................................................................................218 Chapter Summary............................................................................................. 222 Copyright 2018 Cengage Learning. 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WCN 02-200-203 viii Table of Contents Key Terms.......................................................................................................... 223 Review Questions............................................................................................. 223 Case Projects..................................................................................................... 229 CHAPTER 6 Network Security Devices, Design, and Technology..........233 Security Through Network Devices................................................................ 235 Standard Network Devices............................................................................. 236 Network Security Hardware........................................................................... 246 Security Through Network Architecture........................................................ 260 Security Zones................................................................................................260 Network Segregation...................................................................................... 263 Security Through Network Technologies....................................................... 265 Network Access Control (NAC)....................................................................... 265 Data Loss Prevention (DLP)............................................................................ 267 Chapter Summary............................................................................................. 269 Key Terms.......................................................................................................... 271 Review Questions............................................................................................. 271 Case Projects..................................................................................................... 279 CHAPTER 7 Administering a Secure Network.........................................281 Secure Network Protocols............................................................................... 283 Simple Network Management Protocol (SNMP)............................................ 285 Domain Name System (DNS)......................................................................... 286 File Transfer Protocol (FTP)............................................................................ 288 Secure Email Protocols...................................................................................290 Using Secure Network Protocols.....................................................................291 Placement of Security Devices and Technologies......................................... 292 Analyzing Security Data................................................................................... 295 Data from Security Devices............................................................................ 296 Data from Security Software.......................................................................... 297 Data from Security Tools................................................................................ 298 Issues in Analyzing Security Data.................................................................. 298 Managing and Securing Network Platforms................................................. 300 Virtualization..................................................................................................300 Cloud Computing............................................................................................ 304 Software Defined Network (SDN)...................................................................306 Chapter Summary............................................................................................. 309 Copyright 2018 Cengage Learning. 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WCN 02-200-203  Table of Contents ix Key Terms.......................................................................................................... 310 Review Questions............................................................................................. 311 Case Projects..................................................................................................... 318 CHAPTER 8 Wireless Network Security...................................................321 Wireless Attacks................................................................................................ 324 Bluetooth Attacks........................................................................................... 324 Near Field Communication (NFC) Attacks......................................................327 Radio Frequency Identification (RFID) Attacks.............................................. 330 Wireless Local Area Network Attacks..............................................................332 Vulnerabilities of IEEE Wireless Security........................................................ 341 Wired Equivalent Privacy............................................................................... 342 Wi-Fi Protected Setup..................................................................................... 343 MAC Address Filtering.................................................................................... 344 SSID Broadcasting........................................................................................... 345 Wireless Security Solutions............................................................................. 346 Wi-Fi Protected Access (WPA)........................................................................ 347 Wi-Fi Protected Access 2 (WPA2).................................................................... 349 Additional Wireless Security Protections........................................................352 Chapter Summary............................................................................................. 356 Key Terms.......................................................................................................... 359 Review Questions............................................................................................. 359 Case Projects..................................................................................................... 368 PART 4 DEVICE SECURITY 371 CHAPTER 9 Client and Application Security............................................373 Client Security................................................................................................... 375 Hardware System Security..............................................................................375 Securing the Operating System Software....................................................... 379 Peripheral Device Security.............................................................................. 388 Physical Security............................................................................................... 392 External Perimeter Defenses.......................................................................... 393 Internal Physical Access Security................................................................... 395 Computer Hardware Security........................................................................ 400 Application Security.......................................................................................... 401 Application Development Concepts............................................................... 402 Copyright 2018 Cengage Learning. 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WCN 02-200-203 x Table of Contents Secure Coding Techniques..............................................................................404 Code Testing.................................................................................................... 405 Chapter Summary............................................................................................. 406 Key Terms.......................................................................................................... 409 Review Questions............................................................................................. 410 Case Projects..................................................................................................... 417 CHAPTER 10 Mobile and Embedded Device Security...............................421 Mobile Device Types and Deployment........................................................... 423 Types of Mobile Devices................................................................................. 424 Mobile Device Risks.......................................................................................... 432 Mobile Device Vulnerabilities........................................................................ 432 Connection Vulnerabilities............................................................................. 436 Accessing Untrusted Content......................................................................... 436 Deployment Model Risks................................................................................ 438 Securing Mobile Devices.................................................................................. 439 Device Configuration...................................................................................... 439 Mobile Management Tools.............................................................................446 Mobile Device App Security........................................................................... 448 Embedded Systems and the Internet of Things............................................ 449 Embedded Systems........................................................................................449 Internet of Things............................................................................................451 Security Implications...................................................................................... 452 Chapter Summary............................................................................................. 455 Key Terms.......................................................................................................... 457 Review Questions............................................................................................. 457 Case Projects..................................................................................................... 465 PART 5 IDENTITY AND ACCESS MANAGEMENT 469 CHAPTER 11 Authentication and Account Management........................471 Authentication Credentials............................................................................. 473 What You Know: Passwords........................................................................... 475 What You Have: Tokens, Cards, and Cell Phones........................................... 489 What You Are: Biometrics.............................................................................. 492 What You Do: Behavioral Biometrics............................................................. 498 Copyright 2018 Cengage Learning. 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WCN 02-200-203  Table of Contents xi Where You Are: Geolocation.......................................................................... 499 Single Sign-on.................................................................................................... 500 Account Management...................................................................................... 502 Chapter Summary............................................................................................. 505 Key Terms........................................................................................................... 506 Review Questions............................................................................................. 507 Case Projects..................................................................................................... 517 CHAPTER 12 Access Management..............................................................521 What Is Access Control?................................................................................... 523 Access Control Terminology........................................................................... 524 Access Control Models.....................................................................................527 Managing Access Through Account Management....................................... 533 Account Setup..................................................................................................533 Account Auditing............................................................................................ 539 Best Practices for Access Control.................................................................... 540 Separation of Duties....................................................................................... 540 Job Rotation.................................................................................................... 540 Mandatory Vacations......................................................................................541 Clean Desk Policy.............................................................................................541 Implementing Access Control......................................................................... 542 Access Control Lists (ACLs)............................................................................. 542 Group-Based Access Control.......................................................................... 543 Identity and Access Services........................................................................... 544 RADIUS............................................................................................................ 545 Kerberos.......................................................................................................... 547 Terminal Access Control Access Control System+ (TACACS+)....................... 548 Lightweight Directory Access Protocol (LDAP)............................................... 549 Security Assertion Markup Language (SAML)................................................ 550 Authentication Framework Protocols............................................................. 551 Chapter Summary............................................................................................. 552 Key Terms.......................................................................................................... 554 Review Questions............................................................................................. 554 Case Projects..................................................................................................... 561 Copyright 2018 Cengage Learning. 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WCN 02-200-203 xii Table of Contents PART 6 RISK MANAGEMENT 563 CHAPTER 13 Vulnerability Assessment and Data Security.....................565 Assessing the Security Posture....................................................................... 567 What Is Vulnerability Assessment?................................................................ 567 Vulnerability Assessment Tools......................................................................573 Vulnerability Scanning..................................................................................... 584 Penetration Testing.......................................................................................... 586 Practicing Data Privacy and Security.............................................................. 588 What Is Privacy?.............................................................................................. 589 Risks Associated with Private Data................................................................590 Maintaining Data Privacy and Security.......................................................... 592 Chapter Summary............................................................................................. 596 Key Terms.......................................................................................................... 598 Review Questions............................................................................................. 598 Case Projects..................................................................................................... 604 CHAPTER 14 Business Continuity 607 What Is Business Continuity?.......................................................................... 609 Business Continuity Planning (BCP)..............................................................609 Business Impact Analysis (BIA)....................................................................... 611 Disaster Recovery Plan (DRP)..........................................................................612 Fault Tolerance Through Redundancy........................................................... 615 Servers............................................................................................................ 616 Storage.............................................................................................................617 Networks..........................................................................................................621 Power.............................................................................................................. 622 Recovery Sites................................................................................................. 622 Data................................................................................................................. 623 Environmental Controls................................................................................... 628 Fire Suppression............................................................................................. 628 Electromagnetic Disruption Protection...........................................................631 HVAC................................................................................................................631 Incident Response............................................................................................ 633 What Is Forensics?.......................................................................................... 633 Copyright 2018 Cengage Learning. 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WCN 02-200-203  Table of Contents xiii Incident Response Plan.................................................................................. 633 Forensics Procedures...................................................................................... 634 Chapter Summary............................................................................................. 640 Key Terms.......................................................................................................... 642 Review Questions............................................................................................. 643 Case Projects..................................................................................................... 649 CHAPTER 15 Risk Mitigation.......................................................................651 Managing Risk................................................................................................... 653 Threat Assessment......................................................................................... 654 Risk Assessment............................................................................................. 656 Strategies for Reducing Risk............................................................................ 664 Using Control Types....................................................................................... 664 Distributing Allocation...................................................................................666 Implementing Technology.............................................................................666 Practices for Reducing Risk............................................................................. 668 Security Policies..............................................................................................669 Awareness and Training................................................................................. 675 Agreements..................................................................................................... 677 Personnel Management.................................................................................. 679 Troubleshooting Common Security Issues.................................................... 679 Chapter Summary............................................................................................. 680 Key Terms.......................................................................................................... 682 Review Questions............................................................................................. 682 Case Projects..................................................................................................... 688 APPENDIX A CompTIA SY0-501 Certification Exam Objectives 691 GLOSSARY 713 INDEX 741 Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203 Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  INTRODUCTION The number one concern of computer professionals today continues to be information security, and with good reason. Consider the evidence: over 1.5 billion Yahoo user accounts were compromised in just two separate attacks.1 A ransom of $1 million dollars was paid to unlock files that had been encrypted by ransomware.2 A global payment sys- tem used to transfer money between countries was compromised by attackers who stole $81 billion from the central bank of Bangladesh.3 It is estimated that global spending on products and services to prevent these attacks will exceed $1 trillion cumulatively between 2017 and 2021. But despite the huge sum spent on protection, cybercrime will still cost businesses over $6 trillion by 2021.4 As attacks continue to escalate, the need for trained security per- sonnel also increases. It is estimated that there are currently over 1.5 million unfilled security jobs worldwide and this will grow by 20 percent to 1.8 million by the year 2022.5 According to the U.S. Bureau of Labor Statistics (BLS) “Occupational Outlook Handbook,” the job out- look for information security analysts through 2024 is expected to grow by 18 percent, faster than the average growth rate.6 To verify security competency, most organizations use the Comput- ing Technology Industry Association (CompTIA) Security+ certification, a vendor-neutral credential. Security+ is one of the most widely recog- nized security certifications and has become the security foundation for today’s IT professionals. It is internationally recognized as validat- ing a foundation level of security skills and knowledge. A successful Security+ candidate has the knowledge and skills required to identify threats, attacks and vulnerabilities; use security technologies and tools; understand security architecture and design; perform identity and access management; know about risk management; and use cryptography. Security+ Guide to Network Security Fundamentals, Sixth Edition is designed to equip learners with the knowledge and skills needed to be information security professionals. Yet it is more than an “exam prep” book. While teaching the fundamentals of information security by using the CompTIA Security+ exam objectives as its framework, it takes a comprehensive view of security by examining in-depth the attacks against networks and computer systems and the necessary defense mechanisms. Security+ Guide to Network Security Fundamen- tals, Sixth Edition is a valuable tool for those who want to learn about security and who desire to enter the field of information security. It also provides the foundation that will help prepare for the CompTIA Security+ certification exam. xv Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203 xvi Introduction Intended Audience This book is designed to meet the needs of students and professionals who want to master basic information security. A fundamental knowledge of computers and net- works is all that is required to use this book. Those seeking to pass the CompTIA Secu- rity+ certification exam will find the text’s approach and content especially helpful; all Security+ SY0-501 exam objectives are covered in the text (see Appendix A). Security+ Guide to Network Security Fundamentals, Sixth Edition covers all aspects of network and computer security while satisfying the Security+ objectives. The book’s pedagogical features are designed to provide a truly interactive learning experience to help prepare you for the challenges of network and computer security. In addition to the information presented in the text, each chapter includes Hands-On Projects that guide you through implementing practical hardware, software, network, and Internet security configurations step by step. Each chapter also contains case stud- ies that place you in the role of problem solver, requiring you to apply concepts pre- sented in the chapter to achieve successful solutions. Chapter Descriptions Here is a summary of the topics covered in each chapter of this book: Chapter 1, “Introduction to Security,” introduces the network security fundamen- tals that form the basis of the Security+ certification. It begins by examining the cur- rent challenges in computer security and why security is so difficult to achieve. It then defines information security in detail and explores why it is important. Finally, the chapter looks at the fundamental attacks, including who is responsible for them, and defenses. Chapter 2, “Malware and Social Engineering Attacks,” examines attacks that use different types of malware, such as viruses, worms, Trojans, and botnets. It also looks at the different types of social engineering attacks. Chapter 3, “Basic Cryptography,” explores how encryption can be used to protect data. It covers what cryptography is and how it can be used for protection, and then examines how to protect data using three common types of encryption algorithms: hashing, symmetric encryption, and asymmetric encryption. It also covers how to use cryptography on files and disks to keep data secure. Chapter 4, “Advanced Cryptography and PKI,” examines how to implement cryp- tography and use digital certificates. It also looks at public key infrastructure and key management. This chapter covers different transport cryptographic algorithms to see how cryptography is used on data that is being transported. Chapter 5, “Networking and Server Attacks,” explores the different attacks that are directed at enterprises. It includes networking-based attacks as well as server attacks. Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  Introduction xvii Chapter 6, “Network Security Devices, Design, and Technology,” examines how to protect networks through standard network devices and network security hard- ware. It also covers implementing security through network architectures and network technologies. Chapter 7, “Administering a Secure Network,” looks at the techniques for admin- istering a network. This includes understanding common network protocols and the proper placement of security devices and technologies. It also looks at analyzing secu- rity data and securing network platforms such as virtualization, cloud computing, and software defined networks. Chapter 8, “Wireless Network Security,” investigates the attacks on wireless devices that are common today and explores different wireless security mechanisms that have proven to be vulnerable. It also covers several secure wireless protections. Chapter 9, “Client and Application Security,” examines securing the client through hardware and peripherals through hardware and the operating system. It also looks at physical security to create external perimeter defenses and internal physical access security. This chapter also covers application security vulnerabilities and the development of secure apps. Chapter 10, “Mobile and Embedded Device Security,” looks at the different types of mobile devices and the risks associated with these devices. It also explores how to secure these devices and the applications running on them. Finally, it examines how embedded systems and the Internet of Things devices can be secured. Chapter 11, “Authentication and Account Management,” looks at authentication and the secure management of user accounts to enforce authentication. It covers the different types of authentication credentials that can be used to verify a user’s identity and how a single sign-on might be used. It also examines the techniques and technol- ogy used to manage user accounts in a secure fashion. Chapter 12, “Access Management,” introduces the principles and practices of access control by examining access control terminology, the standard control mod- els, and managing access through account management. It also covers best practices, implementing access control, and identity and access services. Chapter 13, “Vulnerability Assessment and Data Security,” explains what vulner- ability assessment is and examines the tools and techniques associated with it. It also explores the differences between vulnerability scanning and penetration testing. The chapter concludes with an examination of data privacy. Chapter 14, “Business Continuity,” covers the importance of keeping business processes and communications operating normally in the face of threats and disrup- tions. It explores business continuity, fault tolerance, environmental controls, and inci- dent response. Chapter 15, “Risk Mitigation,” looks at how organizations can establish and main- tain security in the face of risk. It defines risk and the strategies to control it. This chap- ter also covers practices for reducing risk and troubleshooting common security issues. Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203 xviii Introduction Appendix A, “CompTIA SY0-501 Certification Examination Objectives,” provides a complete listing of the latest CompTIA Security+ certification exam objectives and shows the chapters and headings in the book that cover material associated with each objective, as well as the Bloom’s Taxonomy level of that coverage. Features To aid you in fully understanding computer and network security, this book includes many features designed to enhance your learning experience. Maps to CompTIA Objectives. The material in this text covers all the CompTIA Security+ SY0-501 exam objectives. Chapter Objectives. Each chapter begins with a detailed list of the concepts to be mastered in that chapter. This list provides you with both a quick reference to the chapter’s contents and a useful study aid. Today’s Attacks and Defenses. Each chapter opens with a vignette of an actual security attack or defense mechanism that helps to introduce the material covered in that chapter. Illustrations and Tables. Numerous illustrations of security vulnerabilities, attacks, and defenses help you visualize security elements, theories, and concepts. In addition, the many tables provide details and comparisons of practical and theoretical information. Chapter Summaries. Each chapter’s text is followed by a summary of the concepts introduced in that chapter. These summaries provide a helpful way to review the ideas covered in each chapter. Key Terms. All the terms in each chapter that were introduced with bold text are gathered in a Key Terms list, providing additional review and highlighting key con- cepts. Key Term definitions are included in the Glossary at the end of the text. Review Questions. The end-of-chapter assessment begins with a set of review questions that reinforce the ideas introduced in each chapter. These questions help you evaluate and apply the material you have learned. Answering these questions will ensure that you have mastered the important concepts and provide valuable practice for taking CompTIA’s Security+ exam. Hands-On Projects. Although it is important to understand the theory behind network security, nothing can improve on real-world experience. To this end, each chapter provides several Hands-On Projects aimed at providing you with practical security software and hardware implementation experience. These proj- ects use the Windows 10 operating system, as well as software downloaded from the Internet. Case Projects. Located at the end of each chapter are several Case Projects. In these extensive exercises, you implement the skills and knowledge gained in the chapter through real design and implementation scenarios. Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  Introduction xix New to This Edition Maps fully to the latest CompTIA Security+ exam SY0-501 Completely revised and updated with expanded coverage on attacks and defenses New chapter units: Security and Its Threats, Cryptography, Network Attacks and Defenses, Device Security, Identity and Access Management, and Risk Management Earlier coverage of cryptography and advanced cryptography All new “Today’s Attacks and Defenses” opener in each chapter New and updated Hands-On Projects in each chapter covering some of the latest security software More Case Projects in each chapter Expanded Information Security Community Site activity in each chapter allows ­learners to interact with other learners and security professionals from around the world All SY0-501 exam topics fully defined Linking of each exam sub-domain to Bloom’s Taxonomy (see Appendix A) Text and Graphic Conventions Wherever appropriate, additional information and exercises have been added to this book to help you better understand the topic at hand. Icons throughout the text alert you to additional materials. The following icons are0 used in this textbook: Note The Note icon draws your attention to additional helpful material related to the subject being described. Tips based on the author’s experience provide extra informa- Tip tion about how to attack a problem or what to do in real-world situations. The Caution icons warn you about potential mistakes or prob- Caution lems, and explain how to avoid them. Hands-On Projects help you understand the theory behind network Hands-On Projects security with activities using the latest security software and hardware. The Case Projects icon marks Case Projects, which are scenario- Case Projects based assignments. In these extensive case examples, you are asked to implement independently what you have learned.  ertification icons indicate CompTIA Security+ objectives covered C Certification under major chapter headings. Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203 xx Introduction Instructor’s Materials Everything you need for your course in one place. This collection of book-specific lecture and class tools is available online. Please visit login.cengage.com and log in to access instructor-specific resources on the Instructor Companion Site, which includes the Instructor’s Manual, Solutions Manual, test creation tools, PowerPoint Presenta- tions, Syllabus, and figure files. Electronic Instructor’s Manual. The Instructor’s Manual that accompanies this textbook includes the following items: additional instructional material to assist in class preparation, including suggestions for lecture topics. Solutions Manual. The instructor’s resources include solutions to all end-of-­ chapter material, including review questions and case projects. Cengage Testing Powered by Cognero. This flexible, online system allows you to do the following: Author, edit, and manage test bank content from multiple Cengage solutions. Create multiple test versions in an instant. Deliver tests from your LMS, your classroom, or wherever you want. PowerPoint Presentations. This book comes with a set of Microsoft PowerPoint slides for each chapter. These slides are meant to be used as a teaching aid for classroom presentations, to be made available to students on the network for chapter review, or to be printed for classroom distribution. Instructors are also at liberty to add their own slides for other topics introduced. Figure Files. All the figures and tables in the book are reproduced. Similar to Power- Point presentations, these are included as a teaching aid for classroom presentation, to make available to students for review, or to be printed for classroom distribution. Total Solutions For Security To access additional course materials, please visit www.cengagebrain.com. At the ­cengagebrain.com home page, search for the ISBN of your title (from the back cover of your book) using the search box at the top of the page. This will take you to the product page where these resources can be found. MindTap MindTap for Security+ Guide to Network Security Fundamentals, Sixth Edition is a per- sonalized, fully online digital learning platform of content, assignments, and services that engages students and encourages them to think critically, while allowing you to easily set your course through simple customization options. MindTap is designed to help students master the skills they need in today’s workforce. Research shows employers need critical thinkers, troubleshooters, and creative problem solv- ers to stay relevant in our fast paced, technology-driven world. MindTap helps you achieve this with assignments and activities that provide hands-on practice, real-life relevance, and certification test prep. Students are guided through assignments that help them master basic knowledge and understanding before moving on to more challenging problems. Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  Introduction xxi The live virtual machine labs provide real-life application and practice as well as more advanced learning. Students work in a live environment via the Cloud with real servers and networks that they can explore. The IQ certification test preparation engine allows students to quiz themselves on specific exam domains, and the pre- and post-course assessments measure exactly how much they have learned. Readings, lab simulations, capstone projects, and videos support the lecture, while “In the News” assignments encourage students to stay current. MindTap is designed around learning objectives and provides the analytics and reporting to easily see where the class stands in terms of progress, engagement, and completion rates. Students can access eBook content in the MindTap Reader, which offers ­highlighting, note-taking, search and audio, as well as mobile access. Learn more at www.cengage.com/mindtap/. Instant Access Code: (ISBN: 9781337289306) Printed Access Code: (ISBN: 9781337289313) Lab Manual Hands-on learning is necessary to master the security skills needed for both Comp- TIA’s Security+ Exam and for a career in network security. Security+ Guide to Network Security Fundamentals Lab Manual, 6th Edition contains hands-on exercises that use fundamental networking security concepts as they are applied in the real world. Each chapter offers review questions to reinforce your mastery of network security topics and to sharpen your critical thinking and problem-solving skills. (ISBN: 9781337288798) Bloom’s Taxonomy Bloom’s Taxonomy is an industry-standard classification system used to help iden- tify the level of ability that learners need to demonstrate proficiency. It is often used to classify educational learning objectives into different levels of complexity. Bloom’s Taxonomy reflects the “cognitive process dimension.” This represents a continuum of increasing cognitive complexity, from remember (lowest level) to create (highest level). There are six categories in Bloom’s Taxonomy as seen in Figure A. In all instances, the level of coverage the domains in Security+ Guide to Network Security Fundamentals, Sixth Edition meets or exceeds the Bloom’s Taxonomy level indicated by CompTIA for that objective. See Appendix A for more detail. Information Security Community Site Stay secure with the Information Security Community Site. Connect with students, profes- sors, and professionals from around the world, and stay on top of this ever-changing field. Visit http://community.cengage.com/Infosec2/ to: Download resources such as instructional videos and labs. Ask authors, professors, and students the questions that are on your mind in the Discussion Forums. See up-to-date news, videos, and articles. Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203 xxii Introduction Bloom’s Taxonomy Produce new or original work create Design, assemble, construct, conjecture, develop, formulate, author, investigate Justify a stand or decision evaluate appraise, argue, defend, judge, select, support, value, critique, weigh Draw connections among ideas differentiate, organize, relate, compare, contrast, distinguish, analyze examine, experiment, question, test Use information in new situations apply execute, implement, solve, use, demonstrate, interpret, operate, schedule, sketch Explain ideas or concepts understand classify, describe, discuss, explain, identify, locate, recognize, report, select, translate remember Recall facts and basic concepts define, duplicate, list, memorize, repeat, state Figure A Bloom’s taxonomy Read regular blogs from author Mark Ciampa. Listen to podcasts on the latest Information Security topics. Review textbook updates and errata. Each chapter’s Case Projects include information on a current security topic and ask the learner to post reactions and comments to the Information Security Com- munity Site. This allows users from around the world to interact and learn from other users as well as security professionals and researchers. What’s New With Comptia Security+ Certification The CompTIA Security+ SY0-501 exam was updated in October 2017. Several significant changes have been made to the exam objectives. The exam objectives have been sig- nificantly expanded to more accurately reflect current security issues and knowledge requirements. These exam objectives place importance on knowing “how to” rather than just knowing or recognizing security concepts. Here are the domains covered on the new Security+ exam: Domain % of Examination 1.0 Threats, Attacks & Vulnerabilities 21% 2.0 Technologies & Tools 22% 3.0 Architecture & Design 15% 4.0 Identity & Access Management 16% 5.0 Risk Management 14% 6.0 Cryptography & PKI 12% Total 100% Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  Introduction xxiii Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203 xxiv Introduction About The Author Dr. Mark Ciampa is an Associate Professor of Information Systems in the Gordon Ford Col- lege of Business at Western Kentucky University in Bowling Green, Kentucky. Prior to this, he was an Associate Professor and served as the Director of Academic Computing at Vol- unteer State Community College in Gallatin, Tennessee for 20 years. Mark has worked in the IT industry as a computer consultant for businesses, government agencies, and educa- tional institutions. He has published over 20 articles in peer-reviewed journals and is also the author of 25 technology textbooks, including Security+ Guide to Network Security Fun- damentals 6e, CWNA Guide to Wireless LANs 3e, Guide to Wireless Communications, Security Awareness: Applying Practical Security in Your World 5e, and Networking BASICS. Dr. Ciampa holds a PhD in technology management with a specialization in digital communication systems from Indiana State University and has certifications in Security+ and HIT. Acknowledgments A large team of dedicated professionals all contributed to the creation of this book. I am honored to be part of such an outstanding group of professionals. First, thanks go to Product Manager Kristin McNary for giving me the opportunity to work on this project and for providing her continual support, and to Associate Product Manager Amy Savino for answering all my questions. Also thanks to Senior Content Developer Michelle Ruelos Cannistraci who was very supportive, to Senior Content Product Manager Brooke Green- house who helped keep this fast-moving project on track, and to Dr. Andy Hurd who performed the technical reviews. To everyone on the team I extend my sincere thanks. Special recognition again goes to the very best developmental editor, Deb Kaufmann, who is a true professional in every sense of the word. She made many helpful suggestions, found all my errors, watched every small detail, and even took on additional responsibilities so that this project could accelerate to be completed even before its deadlines. Without question, Deb is simply the very best there is. And finally, I want to thank my wonderful wife, Susan. Her love, interest, support, and patience gave me what I needed to complete this project. I could not have written this book without her. Dedication To Braden, Mia, Abby, Gabe, Cora, and Will. To The User This book should be read in sequence, from beginning to end. Each chapter builds on those that precede it to provide a solid understanding of networking security funda- mentals. The book may also be used to prepare for CompTIA’s Security+ certification exam. Appendix A pinpoints the chapters and sections in which specific Security+ exam objectives are covered. Hardware and Software Requirements Following are the hardware and software requirements needed to perform the end-of- chapter Hands-On Copyright Projects. 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  Introduction xxv Microsoft Windows 10 An Internet connection and web browser Microsoft Office Free Downloadable Software Requirements Free, downloadable software is required for the Hands-On Projects in the following chapters. Chapter 1: Microsoft Safety Scanner Oracle VirtualBox Chapter 2: Irongeek Thumbscrew Refog Keylogger Chapter 3: OpenPuff Steganography HashCalc Jetico BestCrypt Chapter 4: Comodo Secure Email Certificate Chapter 5: Qualys Browser Check GRC Securable Chapter 6: GlassWire K9 Web Protection Chapter 7: VMware vCenter Converter VMware Workstation Player Chapter 8: Xirrus Wi-Fi Inspector Vistumbler Chapter 9: EICAR AntiVirus Test File Chapter 10: Prey Project Bluestacks Andy Android emulator Lookout Security & Antivirus Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203 xxvi Introduction Chapter 11: Hashcat HashcatGUI BioID Facial Recognition Authenticator GreyC-Keystroke KeePass Chapter 13: Flexera Personal Software Inspector Macrium Reflect Nmap Chapter 14: Directory Snoop Nmap Chapter 15: Browzar UNetbootin Linux Mint References 1. Newman, Lilly, “Hack brief: Hackers breach a billion Yahoo accounts,” Wired, Dec. 14, 2016, retrieved Jul. 3, 2017, https://www.wired.com/2016/12/yahoo-hack-billion-users/. 2. Chang, Ziv, Sison, Gilbert, Jocson, Jeanne, “Erebus resurfaces as Linux ransomware,” TrendLabs Security Intelligence Blog, Jun. 19, 2017, retrieved Jul. 3, 2017, http://blog.trendmicro.com/trendlabs-security-intelligence/erebus-resurfaces-as-linux-ransomware/. 3. Corkery, Michael, and Goldstein, Matthew, “North Korea said to be target of inquiry over $81 million cyberheist,” New York Times, Mar. 22, 2017, retrieved Jul. 3, 2017, https://www. nytimes.com/2017/03/22/business/dealbook/north-korea-said-to-be-target-of-inquiry -over-81-million-cyberheist.html. 4. “Cybersecurity market report,” Cybersecurity Ventures, Q2 2017, retrieved Jul. 3, 2017, http://cybersecurityventures.com/cybersecurity-market-report/. 5. Nash, Kim, “Firms vie in hiring of cyber experts,” Wall Street Journal, May 15, 2017, retrieved Jul. 10, 2017, https://www.wsj.com/articles/for-many-companies-a- good-cyber-chief-is-hard-to-find-1494849600. 6. “Information security analysts: Occupational outlook handbook,” Bureau of Labor Statistics, Dec. 17, 2015, retrieved Jul. 3, 2017, https://www.bls.gov/ooh/computer-and-information -technology/information-security-analysts.htm. Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  PART I SECURITY AND ITS THREATS Chapter 1 Introduction to Security Chapter 2 Malware and Social Engineering Attacks The security of the data and information contained on computers and digital devices today is threatened more than ever before, and the attacks are escalating every day. The chapters in this part introduce security and outline many of these threats. The chapters in later parts will give you the understanding and tools you need to defend against these attacks. 1 Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203 Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203  CHAPTER 1 INTRODUCTION TO SECURITY After completing this chapter you should be able to do the following: Explain the challenges of securing information Define information security and explain why it is important Identify the types of threat actors that are common today Describe how to defend against attacks Today’s Attacks and Defenses Almost everyone would assume that the director of the Central Intelligence Agency (CIA) would be well-versed in security procedures and would practice these to the letter of the law. This is because of the extreme danger that would result from a compromise or theft of highly classified information about active CIA agents or sensitive activities that are underway. The exposure of this information could result in a serious international incident or even the capture and torture of secret agents. However, a former CIA director who failed to follow basic security procedures put sensitive CIA information at risk. Former CIA Director John Brennan had recently completed a sensitive 47-page SF-86 application to update his own top-secret government security clearance. These applications are used by the federal government for conducting a background check on individuals 3 Copyright 2018 Cengage Learning. All Rights Reserved. May not be copied, scanned, or duplicated, in whole or in part. WCN 02-200-203 4 CHAPTER 1 Introduction to Security requesting such a security clearance. The forms contain a wealth of sensitive data about the person—criminal history, psychological records, any past drug use, information about the applicant’s interactions with foreign nationals—as well as information on their spouses, family members, and even friends. In the wrong hands this information could easily be used as blackmail material. Despite government restrictions Brennan routinely forwarded classified emails from his CIA email account to his less-secure personal AOL email account. One of the emails contained his own SF-86 application as an attachment, a serious breach of CIA security protocol. An attacker who claimed to be under the age of 20 along with two friends decided to see if they could uncover classified CIA documents. The attacker first did a reverse lookup of Brennan’s public phone number to reveal that the phone was served by the carrier Verizon Wireless. The attacker called Verizon’s customer service number and pretended to be a Verizon technician. He said he had a customer lined up on a scheduled callback but was unable to access Verizon’s customer database on his own because “our tools were down.” So, could Verizon customer service give him the email address that was linked to Brennan’s phone number? The friendly and helpful Verizon customer service representative said, “Sure, no problem.” The pretender then asked if the Verizon representative would also give him the last four digits of the customer’s bank card that was on file. Once again, the representative was glad to help. By the time the call was over the pretender had Brennan’s Verizon account number, his four-digit personal identification number, the backup private mobile cellphone number on the account, his AOL email address, and the last four digits on his bank card. The attacker now had the information that he needed. Knowing that Brennan had an AOL email account he next called AOL and said he was locked out of that account. The AOL representative asked him to verify his identity by answering two questions: the name and phone number associated with the account and the last four digits of the bank card on file— all of which had been provided by Verizon. The AOL representative then reset the password on the email account to a new password for the attacker. The attacker then logged into Brennan’s AOL email account, where he read several dozen emails, some of which the director had forwarded from his government work email and that contained attachments. Among the attachments was Brennan’s own SF-86 application and a spreadsheet containing names and Social Security numbers of several U.S. intelligence officials. It is speculated that the spreadsheet might have been a list of guests who were visiting the White House when Brennan was the President’s counter- terrorism adviser. Another attachment was a letter fro