Information System Security Engineering and Management Dr. William Hery [email protected] [email protected] CS 996 Spring 2005

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Information System Security Engineering and Management

Dr. William [email protected]

[email protected]

CS 996Spring 2005

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.

Outline of Presentation

• Course Motivation• Approach to Learning, Grading in

This Course• Main Course Topics• Highlights of course topics to show

linkage• Term Project Structure


Initial Course Motivation

• For SFS students: fill in gaps in National Security Telecommunications and Information Systems Security Committee (NSTISSC) certification for NSA NSTISSI 4011: National Training Standards for INFOSEC

Professionals (http://www.nstissc.gov/html/library.html)

• Most technical topics are covered in other courses Missing NSTISSI technical tidbits inserted as needed

• The “missing” topics are all related to management, policy and systems engineering. The course will be a survey of information system security

engineering and management topics over a system life cycle• Although a “government” motivation in selecting the

topics, all are broadly applicable to developing and managing commercial systems securely


Course Focus

• Broad management perspective applicable to DoD/NSA, civilian government agencies, corporate world: think like a manager If you are a manager If you have to deal with a manager

• System, not detail, focus Not about security products (crypto, fiewall, etc.), but how to

use them in a system• Many topics are subjective, not objective

There may be no “right way” or “right answer”• Many topics should be courses in themselves

This course will teach you what to think about, not how to do everything!

• Secondary goal: Gain experience in teamwork, government project organization, presentations and report writing.


Course Organization

• Weekly graded homework• Each student will present a one hour

lecture on a topic--and assign reading and homework for it

• Reading assignments and class discussion Active participation in discussion part of

grade!

• Student team projects (more later)

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Grading

Homework: Due before the next class after assignment Each graded on a 100 point scale 10 points per week (or fraction thereof) deducted for any homework

submitted after the due date Ten highest individual HW grades averaged to get overall HW grade

Lecture: Graded on the basis of discovering and understanding material, and organization of presentation.

Team Project: Grades based on: Depth of understanding of security both the technical issues and the

application of systems engineering and management processes Organization of final presentation and report All members of a team get the same grade

Overall grade: 40% homework, 40% project, 20% lecture


References

• Primary text: Ronald Krutz and Russell Vines, The CISM Prep Guide, Wiley, 2003, ISBN 0-471-45598-9

• Supplementary material from: Ross Anderson, Security Engineering, Wiley,

2001, ISBN 0-471-38922-6 Tipton and Krause, Information Security

Management Handbook, 4th Edition, Auerbach, ISBN 0-8493-1518-2 (Copy in ISIS Lab)

Various web sites, etc.

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Key Points About Security For a Manager

• Information Security is a key part of the life cycle processes for any system: System conception and design System development Operation of deployed systems System “decommission”

• It is critical to include security considerations from the beginning of system conception and design

• Use of security technology (firewalls, crypto, IDS, patching), etc. is only part of security: security is based on people, processes, and technology

• Actively managing the “security process” is a key part of achieving security

• People (developers, users, hackers) are (sometimes without actively knowing it) are part of the security process


Key Points (Part II)

• Security is a wide array of options, not a yes/no choice No security is probably not enough Near perfect security is difficult, expensive, hard to

use, and takes a long time to do. It is probably too much

• The key is to find the “sweet spot” of enough security for your particular system. This is a key management decision.

• Many topics are subjective, not objective There may be no “right way” or “right answer”


Extremes of Security

A system in an open area, which allows

anyone to use it and allows anything to come in or go out over multiple

networks provides virtually no security

(e. g., Internet Café)

A system in a locked room, with 2 foot thick concrete and metal

walls (Faraday cage), no windows, battery operated (no power lines, a secure operating

system, strongly encrypted data, armed guards, and only

one person allowed in provides very strong security (e. g., most secure NSA system…maybe)


Costs of Security

Security

Development cost

Development time

Equipment cost

Maintenance cost

Usability?

Functionality?

Performance?


Finding the “Sweet Spot”

• The sweet spot depends on what you need to protect, and what environment you are operating in

• The key to finding the “sweet spot” is to understand the security requirements Requirements may be hard to pin down Different aspects of a system may have very different security

requirements The “sweet spot” is getting the right level of security for each aspect

• Two common errors in finding the “sweet spot”: Uniformly low security because management does not understand

the risk. Uniformly, strong, and expensive approach to security everywhere,

when less (e. g., no crypto) is enough in most places, with something stronger in selected places (e. g., protecting passwords or crypto keys)


What is Information Security?

• A set of properties of the information system, not a technology

• These properties are provided with both of processes and technologies

• The properties: CIA Confidentiality: only permitted entities are allowed to

“see” the information Integrity: only permitted entities are allowed to modify

the information (this includes creation and deletion) Integrity preservation: you know it can’t be changed Integrity violation detection: you can’t trust and must go

to a backup or alternate source Availability: the information is available when needed


Related security concepts

• Identification: a means of saying who/what an entity is• Authentication: a means to verify that an entity is who it

claims to be for decisions in support of confidentiality and integrity

• Access Control: a means to enforce which entities have access to information to support confidentiality and integrity

• Authorization: a combination of authentication (who) and access control

• Non-repudiation: integrity of the pair (information, creator of information)

• Privacy: confidentiality of personal information• Anonymity: confidentiality of identity• Recovery: restoration of a system to a “correct” state after

a security incident.

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Methods to Provide Security Properties

Security Property Sample Non-IT Method Sample IT TechnologyConfidentiality Sealed envelope, Safe Crypto, Access controlIntegrity preservation Safe Access Control, write only mediaIntegrity detection “Safety” check background, Watermark Crypto, secure hashAvailability Multiple credit cards (availability of

personal credit)Redundant server locations; strong systemssecurity (firewall, IDS, secured OS &applications, etc.)

Identification Name tags Login ID, user nameAuthentication Signature, ID badge, passport ID/password, biometrics (fingerprint, retinal

scan, etc.), crypto tokens, digital certificateAccess Control Locks, ID badges Login/password, file permissionsNon-Repudiation Notary Public; certified mail with return

receipt (non-repudiation of sending, andreceipt)

Digital Signature

Privacy Locked safe at home, shreddingdocuments

Encrypted files on home computer

Anonymity Call from coin phone Anonymous web browsing services (e. g.http://www.privoxy.org/)

Recovery Photocopies of important documents insafe deposit box

Offsite backup at standby facility


DoD terminology

• Communications Security (COMSEC) Security of information (voice, data) while in transit. Includes

switched circuits, radio links, microwave, satellite, packet nets, Asynchronous Transfer Mode (ATM), Synchronous Optical Networks (SONET), Packet over fiber, free space optics, etc.

• Computer Security (COMPUSEC) Security of information while stored or being processed on a

computer• Information Security (INFOSEC)

COMPUSEC + COMSEC• Transmission Security (TRANSEC)

Security of Transmission media• Operations Security (OPSEC)

Operational processes for protecting potentially sensitive unclassified material (people and technology)

• Automated Information Systems (AIS) Computers + networks linking computers


Security vs. Reliability

• Security attacks, software flaws, and hardware failure can all lead to violations of “CIA”

• For some events, it may be hard to determine which class of flaws is the cause.

• Some protection and recovery mechanisms are the same for both security attacks and hardware or software failures


Security vs Reliability Differences

• Hardware failures No malicious cause Usually affects “A”, sometimes “I” or “C” Typically independent events Testing is often a reliable way to find hardware failures on

deployed systems Stochastic and temporal (e. g., mean time between failure, MTBF)

failure models are useful metrics “Availability” is also a standard term in reliability

• Software failure No malicious attack: design or coding error Can affect “A”, sometimes “I” or “C” Often correlated events from same flaw as similar state

conditions arise in different instantiations Stochastic models of limited value

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Security vs Reliability Differences (continued)

• Security breach Malicious attack Serious attacks often attempt to hide

event Can affect “A”, “I” or “C” In most cases, the most serious

impacts are attacks on “I” or “C” Many attacks are highly correlated

worldwide, but some are very targeted and correlations may be hard to find


Survivable Systems

• Systems that provide both reliability and security are called survivable (or dependable)

• Reliability and security requirements are often similar in nature (particularly availability), and it makes sense to combine the requirements analysis for both

• Designing secure systems and reliable systems both depend on understanding what is at risk if there is a failure (security compromise or system failure), what the threats are (hackers, failure modes), and managing that risk

• It is sometimes hard to distinguish between a reliability failure and a security breach (e. g., the 2003 northeast blackout).

• Recovery from a failure and a security breach are sometimes similar, and it makes sense to combine the recovery plans.

• Security is considered by some to be a subset of reliability, with security breaches just another form of failure… But the malicious, planned, correlated, and hidden aspects of security

breaches requires a very different protection approach to most aspects of reliability


Where are security flaws?

• In system design Not planning for security (many things today) Designing security incorrectly (WiFi original encryption standard)

• In system implementation Ambiguous/incomplete design document Implementation errors (buffer overflows, etc.)

• In system use Configuration--often weakest security “out of the box” Failure to keep up with updates/patches Physical security

• Ill advised user actions Poor passwords/passwords written down Victims of “social engineering”

Management needs to keep all of this in mind when designing, implementing and deploying systems

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Management Security Concerns

• Classified information at DoD/NSA/other govt agencies: National security, loss of life, “sources and methods,”

political, career impacts of security breech

• Unclassified government information: Political, financial, legal, career impacts of security

breech

• Corporate Financial, intellectual property, legal, corporate image,

career impacts of security breech

• Almost no managers: neat technology

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Sources of Security Requirements

• Risk analysis (national security, lives, property, money)

• Legal (e. g., HIPAA, Sarbannes_Oxely, privacy laws)

• Higher level government/corporate policies• Corporate/agency/personal image• Others derived from the above

• Requirements may change due to costs, changing threat environment, etc. Requirements may not be known or understood at the

start of a project

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Steps to Include Security in the System Life Cycle

• Risk analysis (for the most fundamental security requirements)• Complete security requirements analysis

Security is a “non-functional” requirement, as is reliability

• High level security policy (technology, management processes, personnel policies)

• Overall system engineering Includes security design and development Lower level security requirements and policies developed Security should be an integral element from the start

• Security management of deployed system• Incident Response• Business Continuity Planning• Decommissioning of systems and components


Risk Analysis

• What is at risk (national security, lives, property, money)? Some risk models are based on $ values

• Where does the threat come from? Motivation (national security, money, fame, Capabilities (intellect, equipment, money)

• What vulnerabilities can be exploited Technical Process People

• Risk management Eliminate/reduce risk (e. g., put in crypto, firewall…) Accept risk (with recovery process) Transfer risk (e. g., to an insurance company)


Security Policy

• Essentially a statement of security requirements• Every security policy statement should have a

corresponding enforcement mechanism• Policies are at multiple levels• High level policies flow down to multiple lower level policies

High level; e. g., “company proprietary information shall be protected from release to unauthorized personnel”

Mid level; e. g., “there shall be no externally initiated ftp sessions”

Low level; e. g., a firewall rule blocking incoming traffic on ports 20 (ftp data), 21 (ftp control), and 69 (tftp)

The firewall is the enforcement mechanism• Policies also define management processes (e. g., incident

response actions) and personnel rules (e. g., don’t write down passwords)


Security system engineering

• Part of overall systems engineering process• Iterates requirements, design, review through

multiple levels of detail• Includes design and development• Lower level security policies developed• Security should be an integral element from the

start


Student talks

• Presentations will focus on management and processes, not technical details (you know them already)

• Presenter will be given basic references and other reference pointers, and is encouraged to search for more material

• Presenter to assign background reading the week before the talk

• Review presentation with me for guidance as you develop it

• Prepare for ~ 45 minutes of presentation material, but use one hour+ with discussion

• Active participation of audience is encouraged• Presenter to assign homework on topic


Course Schedule (tentative)

• 1/26 *Overview (Hery)• 2/2 *Risk Analysis (Hery)• 2/9 *Secure Systems Engineering (Hery)• 2/16 ISO 17799 (taken)

SSE/CMM (secure syst. eng. maturity model)• 2/23 Policy (2 hours???--Hery)

Legal and other requirements• 3/2 Security Management and administration of

Deployed Systems (2 hours)• 3/9 Incident Response

Business Continuity Planning (merge w/ above?)

QuickTime™ and aTIFF (Uncompressed) decompressorare needed to see this picture.Course Schedule (tentative) continued

• 3/16 *Assessment/Assurance (Hery)

*Architecture of Classified Systems (Hery)

• 3/30 Security Engineering for Software

TRANSEC/EMSEC/Tempest (EE background)

• 4/6 Physical Security/tamper resistance

Information System Security Officer

• 4/13 Government Key Management Policy

Security Audit (tentatively taken)

• 4/20 Certification and Accreditation

Ethical issues in system design/management??


Student Team Project

• Teams of ~3 students• Pick a system (discuss choice with me)

Want simple functionality, security issues, whole system (e. g., client and server side)

• Submit a 1-2 page proposal to management (Dr. Hery)• Assess risks, threats, vulnerabilities• Develop a security policy• Do a high level system security design• Present a “preliminary design review” (PDR) to management

(include risk analysis, policies, system architecture)• Iterate on risk assessment, policy, design• Present a final “critical design review” (CDR) to

management and the class• Write a final report to management on above

Documents

Information System Security Engineering and Management Dr. William Hery [email protected] [email protected] CS 996 Spring 2005