COMPUTER NETWORK SECURITY
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1 COMPUTER NETWORK SECURITY Prof. Dr. Hasan Hüseyin BALIK (1 st Week)
2 Outline Course Information and Policies Course Syllabus 1. Overview
3 Course Information Instructor: Prof. Dr. Hasan H. BALIK, Class Homepage: rksecurity/ Book: Computer Security: Principles and Practice, 3 rd Edition, William Stallings and Lawrie Brown, 2015 Grading: Assingment (Project) 50% Final 50%
4 Course Syllabus Overview Computer security technology and principles o Cryptographic Tools o User Authentication o Access Control o Database and Cloud Security o Malicious Software o Denial-of-Service Attacks o Intrusion Detection o Firewalls and Intrusion Prevention Systems Software security and trusted systems o Buffer Overflow o Software Security o Operating System Security Management ıssues o IT Security Management and Risk Assessment o IT Security Controls, Plans and Procedures
5 1. Overview
6 1.Outline Computer Security Concepts Threats, Attacks, and Assets Security Functional Requirements Fundamental Security Design Principles Attack Surfaces and Attack Trees Computer Security Strategy
7 Confidentiality - data confidentiality - privacy Integrity - data integrity - system integrity Availability
8 Key Security Concepts Confidentiality Integrity Availability Preserving authorized restrictions on information access and disclosure, including means for protecting personal privacy and proprietary information Guarding against improper information modification or destruction.a loss of integrity is the unauthorized modification or destruction of information Ensuring timely and reliable access to and use of information
9 Levels of Impact Low Moderate High The loss could be expected to have a limited adverse effect on organizational operations, organizational assets, or individuals The loss could be expected to have a serious adverse effect on organizational operations, organizational assets, or individuals The loss could be expected to have a severe or catastrophic adverse effect on organizational operations, organizational assets, or individuals
10 Computer security is not as simple as it might first appear to the novice Potential attacks on the security features must be considered Procedures used to provide particular services are often counterintuitive Physical and logical placement needs to be determined Additional algorithms or protocols may be involved Attackers only need to find a single weakness, the developer needs to find all weaknesses Users and system managers tend to not see the benefits of security until a failure occurs Security requires regular and constant monitoring Is often an afterthought to be incorporated into a system after the design is complete Thought of as an impediment to efficient and user-friendly operation
11 Computer Security Terminology
12 Owners value Threat agents wish to minimize impose countermeasures assets wish to abuse and/or may damage give rise to to reduce risk to to threats that increase Figure 1.1 Security Concepts and Relationships
13 Assets of a Computer System Hardware Software Data Communication facilities and networks
14 Vulnerabilities, Threats and Attacks Categories of vulnerabilities Corrupted (loss of integrity) Leaky (loss of confidentiality) Unavailable or very slow (loss of availability) Threats Capable of exploiting vulnerabilities Represent potential security harm to an asset Attacks (threats carried out) Passive attempt to learn or make use of information from the system that does not affect system resources Active attempt to alter system resources or affect their operation Insider initiated by an entity inside the security parameter Outsider initiated from outside the perimeter
15 Countermeasures Means used to deal with security attacks Prevent Detect Recover Residual vulnerabilities may remain May itself introduce new vulnerabilities Goal is to minimize residual level of risk to the assets
16
17 Computer and Network Assets, with Examples of Threats Hardware Software Data Communication Lines and Networks Availability Confidentiality Integrity Equipment is stolen or disabled, thus denying service. Programs are deleted, denying access to users. Files are deleted, denying access to users. Messages are destroyed or deleted. Communication lines or networks are rendered unavailable. An unencrypted CD- ROM or DVD is stolen. An unauthorized copy of software is made. An unauthorized read of data is performed. An analysis of statistical data reveals underlying data. Messages are read. The traffic pattern of messages is observed. A working program is modified, either to cause it to fail during execution or to cause it to do some unintended task. Existing files are modified or new files are fabricated. Messages are modified, delayed, reordered, or duplicated. False messages are fabricated.
18 Passive and Active Attacks Passive Attack Attempts to learn or make use of information from the system but does not affect system resources Eavesdropping on, or monitoring of, transmissions Goal of attacker is to obtain information that is being transmitted Two types: o Release of message contents Active Attack Attempts to alter system resources or affect their operation Involve some modification of the data stream or the creation of a false stream Four categories: o o o o Replay Masquerade Modification of messages Denial of service o Traffic analysis
19 Fundamental Security Design Principles Economy of mechanism Fail-safe defaults Complete mediation Open design Separation of privilege Least privilege Least common mechanism Psychological acceptability Isolation Encapsulation Modularity Layering Least astonishment
20 Attack Surfaces Consist of the reachable and exploitable vulnerabilities in a system Examples: Open ports on outward facing Web and other servers, and code listening on those ports Services available on the inside of a firewall Code that processes incoming data, , XML, office documents, and industry-specific custom data exchange formats Interfaces, SQL, and Web forms An employee with access to sensitive information vulnerable to a social engineering attack
21 Attack Surface Categories Network Attack Surface Software Attack Surface Human Attack Surface Vulnerabilities over an enterprise network, wide-area network, or the Internet Vulnerabilities in application, utility, or operating system code Included in this category are network protocol vulnerabilities, such as those used for a denialof-service attack, disruption of communications links, and various forms of intruder attacks Particular focus is Web server software Vulnerabilities created by personnel or outsiders, such as social engineering, human error, and trusted insiders
22 Shallow Medium Security Risk High Security Risk Deep Layering Low Security Risk Medium Security Risk Small Large Attack Surface Figure 1.3 Defense in Depth and Attack Surface
23 Bank Account Compromise User credential compromise UT/U1a User surveillance UT/U1b Theft of token and handwritten notes Malicious software installation UT/U3a Smartcard analyzers UT/U3b Smartcard reader manipulator UT/U3c Brute force attacks with PIN calculators Vulnerability exploit UT/U2a Hidden code UT/U2b Worms UT/U2c s with malicious code CC2 Sniffing Injection of commands User credential guessing IBS2 Security policy violation Use of known authenticated session by attacker User communication with attacker CC3 Active man-in-the middle attacks IBS1 Brute force attacks Normal user authentication with specified session ID UT/U4a Social engineering UT/U4b Web page obfuscation Redirection of communication toward fraudulent site CC1 Pharming IBS3 Web site manipulation CC4 Pre-defined session IDs (session hijacking) Figure 1.4 An Attack Tree for Internet Banking Authentication
24 Computer Security Strategy
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