ch02_2.ppt
- 1. Principals of Information Security, Fourth Edition Chapter 2 The Need for Security
- 2. Learning Objectives • Upon completion of this material, you should be able to: – Demonstrate that organizations have a business need for information security – Explain why a successful information security program is the responsibility of both an organization’s general management and IT management Principals of Information Security, Fourth Edition 2
- 3. Learning Objectives (cont’d.) – Identify the threats posed to information security and the more common attacks associated with those threats, and differentiate threats to the information within systems from attacks against the information within systems – Describe the issues facing software developers, as well as the most common errors made by developers, and explain how software development programs can create software that is more secure and reliable Principals of Information Security, Fourth Edition 3
- 4. Introduction • Primary mission of information security is to ensure systems and contents stay the same • If no threats existed, resources could be focused on improving systems, resulting in vast improvements in ease of use and usefulness • Attacks on information systems are a daily occurrence Principals of Information Security, Fourth Edition 4
- 5. Business Needs First • Information security performs four important functions for an organization – Protects ability to function – Enables safe operation of applications implemented on its IT systems – Protects data the organization collects and uses – Safeguards technology assets in use Principals of Information Security, Fourth Edition 5
- 6. Protecting the Functionality of an Organization • Management (general and IT) responsible for implementation • Information security is both management issue and people issue • Organization should address information security in terms of business impact and cost Principals of Information Security, Fourth Edition 6
- 7. Enabling the Safe Operation of Applications • Organization needs environments that safeguard applications using IT systems • Management must continue to oversee infrastructure once in place—not relegate to IT department Principals of Information Security, Fourth Edition 7
- 8. Protecting Data that Organizations Collect and Use • Organization, without data, loses its record of transactions and/or ability to deliver value to customers • Protecting data in motion and data at rest are both critical aspects of information security Principals of Information Security, Fourth Edition 8
- 9. Safeguarding Technology Assets in Organizations • Organizations must have secure infrastructure services based on size and scope of enterprise • Additional security services may be needed as organization grows • More robust solutions may be needed to replace security programs the organization has outgrown Principals of Information Security, Fourth Edition 9
- 10. Threats • Threat: an object, person, or other entity that represents a constant danger to an asset • Management must be informed of the different threats facing the organization • Overall security is improving • The 2009 CSI/FBI survey found – 64 percent of organizations had malware infections – 14 percent indicated system penetration by an outsider Principals of Information Security, Fourth Edition 10
- 11. Principals of Information Security, Fourth Edition 11 Table 2-1 Threats to Information Security4
- 12. Principals of Information Security, Fourth Edition 12 Figure 2-1 World Internet usage3
- 13. Compromises to Intellectual Property • Intellectual property (IP): “ownership of ideas and control over the tangible or virtual representation of those ideas” • The most common IP breaches involve software piracy • Two watchdog organizations investigate software abuse: – Software & Information Industry Association (SIIA) – Business Software Alliance (BSA) • Enforcement of copyright law has been attempted with technical security mechanisms Principals of Information Security, Fourth Edition 13
- 14. Deliberate Software Attacks • Malicious software (malware) designed to damage, destroy, or deny service to target systems • Includes: – Viruses – Worms – Trojan horses – Logic bombs – Back door or trap door – Polymorphic threats – Virus and worm hoaxes Principals of Information Security, Fourth Edition 14
- 15. Principals of Information Security, Fourth Edition 15 Figure 2-4 Trojan Horse Attack
- 16. Deviations in Quality of Service • Includes situations where products or services are not delivered as expected • Information system depends on many interdependent support systems • Internet service, communications, and power irregularities dramatically affect availability of information and systems Principals of Information Security, Fourth Edition 16
- 17. Deviations in Quality of Service (cont’d.) • Internet service issues – Internet service provider (ISP) failures can considerably undermine availability of information – Outsourced Web hosting provider assumes responsibility for all Internet services as well as hardware and Web site operating system software • Communications and other service provider issues – Other utility services affect organizations: telephone, water, wastewater, trash pickup, etc. – Loss of these services can affect organization’s ability to function Principals of Information Security, Fourth Edition 17
- 18. Deviations in Quality of Service (cont’d.) • Power irregularities – Commonplace – Organizations with inadequately conditioned power are susceptible – Controls can be applied to manage power quality – Fluctuations (short or prolonged) • Excesses (spikes or surges) – voltage increase • Shortages (sags or brownouts) – low voltage • Losses (faults or blackouts) – loss of power Principals of Information Security, Fourth Edition 18
- 19. Espionage or Trespass • Access of protected information by unauthorized individuals • Competitive intelligence (legal) vs. industrial espionage (illegal) • Shoulder surfing can occur anywhere a person accesses confidential information • Controls let trespassers know they are encroaching on organization’s cyberspace • Hackers use skill, guile, or fraud to bypass controls protecting others’ information Principals of Information Security, Fourth Edition 19
- 20. Principals of Information Security, Fourth Edition 20 Figure 2-5 Shoulder Surfing
- 21. Principals of Information Security, Fourth Edition 21 Figure 2-6 Hacker Profiles
- 22. Espionage or Trespass (cont’d.) • Expert hacker – Develops software scripts and program exploits – Usually a master of many skills – Will often create attack software and share with others • Unskilled hacker – Many more unskilled hackers than expert hackers – Use expertly written software to exploit a system – Do not usually fully understand the systems they hack Principals of Information Security, Fourth Edition 22
- 23. Espionage or Trespass (cont’d.) • Other terms for system rule breakers: – Cracker: “cracks” or removes software protection designed to prevent unauthorized duplication – Phreaker: hacks the public telephone network Principals of Information Security, Fourth Edition 23
- 24. Forces of Nature • Forces of nature are among the most dangerous threats • Disrupt not only individual lives, but also storage, transmission, and use of information • Organizations must implement controls to limit damage and prepare contingency plans for continued operations Principals of Information Security, Fourth Edition 24
- 25. Human Error or Failure • Includes acts performed without malicious intent • Causes include: – Inexperience – Improper training – Incorrect assumptions • Employees are among the greatest threats to an organization’s data Principals of Information Security, Fourth Edition 25
- 26. Human Error or Failure (cont’d.) • Employee mistakes can easily lead to: – Revelation of classified data – Entry of erroneous data – Accidental data deletion or modification – Data storage in unprotected areas – Failure to protect information • Many of these threats can be prevented with controls Principals of Information Security, Fourth Edition 26
- 27. Principals of Information Security, Fourth Edition 27 Figure 2-8 Acts of Human Error or Failure
- 28. Information Extortion • Attacker steals information from computer system and demands compensation for its return or nondisclosure • Commonly done in credit card number theft Principals of Information Security, Fourth Edition 28
- 29. Missing, Inadequate, or Incomplete • In policy or planning, can make organizations vulnerable to loss, damage, or disclosure of information assets • With controls, can make an organization more likely to suffer losses when other threats lead to attacks Principals of Information Security, Fourth Edition 29
- 30. Sabotage or Vandalism • Threats can range from petty vandalism to organized sabotage • Web site defacing can erode consumer confidence, dropping sales and organization’s net worth • Threat of hacktivist or cyberactivist operations rising • Cyberterrorism: much more sinister form of hacking Principals of Information Security, Fourth Edition 30
- 31. Principals of Information Security, Fourth Edition 31 Figure 2-9 Cyber Activists Wanted
- 32. Theft • Illegal taking of another’s physical, electronic, or intellectual property • Physical theft is controlled relatively easily • Electronic theft is more complex problem; evidence of crime not readily apparent Principals of Information Security, Fourth Edition 32
- 33. Technical Hardware Failures or Errors • Occur when manufacturer distributes equipment containing flaws to users • Can cause system to perform outside of expected parameters, resulting in unreliable or poor service • Some errors are terminal; some are intermittent Principals of Information Security, Fourth Edition 33
- 34. Technical Software Failures or Errors • Purchased software that contains unrevealed faults • Combinations of certain software and hardware can reveal new software bugs • Entire Web sites dedicated to documenting bugs Principals of Information Security, Fourth Edition 34
- 35. Technological Obsolescence • Antiquated/outdated infrastructure can lead to unreliable, untrustworthy systems • Proper managerial planning should prevent technology obsolescence • IT plays large role Principals of Information Security, Fourth Edition 35
- 36. Attacks • Attacks – Acts or actions that exploits vulnerability (i.e., an identified weakness) in controlled system – Accomplished by threat agent that damages or steals organization’s information • Types of attacks – Malicious code: includes execution of viruses, worms, Trojan horses, and active Web scripts with intent to destroy or steal information – Hoaxes: transmission of a virus hoax with a real virus attached; more devious form of attack Principals of Information Security, Fourth Edition 36
- 37. Principals of Information Security, Fourth Edition 37 New Table Table 2-2 Attack Replication Vectors
- 38. Attacks (cont’d.) • Types of attacks (cont’d.) – Back door: gaining access to system or network using known or previously unknown/newly discovered access mechanism – Password crack: attempting to reverse calculate a password – Brute force: trying every possible combination of options of a password – Dictionary: selects specific accounts to attack and uses commonly used passwords (i.e., the dictionary) to guide guesses Principals of Information Security, Fourth Edition 38
- 39. Attacks (cont’d.) • Types of attacks (cont’d.) – Denial-of-service (DoS): attacker sends large number of connection or information requests to a target • Target system cannot handle successfully along with other, legitimate service requests • May result in system crash or inability to perform ordinary functions – Distributed denial-of-service (DDoS): coordinated stream of requests is launched against target from many locations simultaneously Principals of Information Security, Fourth Edition 39
- 40. Principals of Information Security, Fourth Edition 40 Figure 2-11 Denial-of-Service Attacks
- 41. Attacks (cont’d.) • Types of attacks (cont’d.) – Spoofing: technique used to gain unauthorized access; intruder assumes a trusted IP address – Man-in-the-middle: attacker monitors network packets, modifies them, and inserts them back into network – Spam: unsolicited commercial e-mail; more a nuisance than an attack, though is emerging as a vector for some attacks – Mail bombing: also a DoS; attacker routes large quantities of e-mail to target Principals of Information Security, Fourth Edition 41
- 42. Principals of Information Security, Fourth Edition 42 Figure 2-12 IP Spoofing
- 43. Principals of Information Security, Fourth Edition 43 Figure 2-13 Man-in-the-Middle Attack
- 44. Attacks (cont’d.) • Types of attacks (cont’d.) – Sniffers: program or device that monitors data traveling over network; can be used both for legitimate purposes and for stealing information from a network – Phishing: an attempt to gain personal/financial information from individual, usually by posing as legitimate entity – Pharming: redirection of legitimate Web traffic (e.g., browser requests) to illegitimate site for the purpose of obtaining private information Principals of Information Security, Fourth Edition 44
- 45. Principals of Information Security, Fourth Edition 45 Figure 2-14 Example of a Nigerian 4-1-9 Fraud
- 46. Attacks (cont’d.) • Types of attacks (cont’d.) – Social engineering: using social skills to convince people to reveal access credentials or other valuable information to attacker – “People are the weakest link. You can have the best technology; firewalls, intrusion-detection systems, biometric devices ... and somebody can call an unsuspecting employee. That's all she wrote, baby. They got everything.” — Kevin Mitnick – Timing attack: relatively new; works by exploring contents of a Web browser’s cache to create malicious cookie Principals of Information Security, Fourth Edition 46
- 47. Secure Software Development • Many information security issues discussed here are caused by software elements of system • Development of software and systems is often accomplished using methodology such as Systems Development Life Cycle (SDLC) • Many organizations recognize need for security objectives in SDLC and have included procedures to create more secure software • This software development approach known as Software Assurance (SA) Principals of Information Security, Fourth Edition 47
- 48. Software Assurance and the SA Common Body of Knowledge • National effort underway to create common body of knowledge focused on secure software development • US Department of Defense and Department of Homeland Security supported Software Assurance Initiative, which resulted in publication of Secure Software Assurance (SwA) Common Body of Knowledge (CBK) • SwA CBK serves as a strongly recommended guide to developing more secure applications Principals of Information Security, Fourth Edition 48
- 49. Software Design Principles • Good software development results in secure products that meet all design specifications • Some commonplace security principles: – Keep design simple and small – Access decisions by permission not exclusion – Every access to every object checked for authority – Design depends on possession of keys/passwords – Protection mechanisms require two keys to unlock – Programs/users utilize only necessary privileges Principals of Information Security, Fourth Edition 49
- 50. Software Design Principles (cont’d.) • Some commonplace security principles (cont’d.): – Minimize mechanisms common to multiple users – Human interface must be easy to use so users routinely/automatically use protection mechanisms Principals of Information Security, Fourth Edition 50
- 51. Software Development Security Problems • Problem areas in software development: – Buffer overruns – Command injection – Cross-site scripting – Failure to handle errors – Failure to protect network traffic – Failure to store and protect data securely – Failure to use cryptographically strong random numbers Principals of Information Security, Fourth Edition 51
- 52. Software Development Security Problems (cont’d.) • Problem areas in software development (cont’d.): – Format string problems – Neglecting change control – Improper file access – Improper use of SSL – Information leakage – Integer bugs (overflows/underflows) – Race conditions – SQL injection Principals of Information Security, Fourth Edition 52
- 53. Software Development Security Problems (cont’d.) • Problem areas in software development (cont’d.): – Trusting network address resolution – Unauthenticated key exchange – Use of magic URLs and hidden forms – Use of weak password-based systems – Poor usability Principals of Information Security, Fourth Edition 53
- 54. Summary • Unlike any other aspect of IT, information security’s primary mission to ensure things stay the way they are • Information security performs four important functions: – Protects organization’s ability to function – Enables safe operation of applications implemented on organization’s IT systems – Protects data the organization collects and uses – Safeguards the technology assets in use at the organization Principals of Information Security, Fourth Edition 54
- 55. Summary (cont’d.) • Threat: object, person, or other entity representing a constant danger to an asset • Management effectively protects its information through policy, education, training, and technology controls • Attack: a deliberate act that exploits vulnerability • Secure systems require secure software Principals of Information Security, Fourth Edition 55