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Threat Assessment 121
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Information security newsletters and Web sites. For example, http://www.securityfocus.com, CERT, Symantec, FedCIRC and SANS. Current and archived intrusion detection, incident response and application system log files. Previous threat assessment documents, if available, may also contain particularly relevant information.
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From SECURITY NEEDS IDENTIFICATION FOR ENTERPRISE ASSETS (89), the museum has identified its informational and physical assets: Information Asset Types
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Museum employee data Museum financial/insurance data, partner financial data Museum contractual data and business planning Museum research and associated data Museum advertisements and other public data Museum database of collections information
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Museum building Museum staff Museum collections and exhibits Museum transport vehicles
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After use of THREAT ASSESSMENT (113), the museum has identified a brief list of threats to information and physical assets, as shown in the threat Tables 6.14 and 6.15, respectively.
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Threat assessment is, for example, defined in the ISO Technical Report 13335-3 [ISO13335-3]. This definition of the process focuses on three tasks: identification of threat sources, the threat target, and the threat likelihood. It identifies that determining the likelihood should take into account the threat frequency, the threat motive and geographical factors such as proximity to industrial factories. This technical report differentiates the threat likelihood simply as high, medium and low. The actual determination and definition is left to the implementer of the threat-assessment process.
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122 6
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Enterprise Security and Risk Management
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Table 6.14 Threats to information assets
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THREAT ACTION (FREQUENCY) Natural Electrical spike in computer room (3) Incapacitation, corruption of informational assets Incapacitation of informational assets THREAT CONSEQUENCE
Loss of electronic documents (3) Professional criminals Theft of information assets (3)
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Misappropriation, incapacitation, misuse, exposure, corruption of informational assets
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Employees Unauthorized access to informational assets (5) Exposure, falsification, incapacitation, misappropriation of informational assets Corruption of information assets Exposure of information assets
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Data entry errors (5) Leaking confidential information (3)
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Table 6.15
Threats to physical assets
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THREAT CONSEQUENCE
THREAT ACTION (FREQUENCY) Natural Museum fire (3) Fatigue of support fixtures, building structural failure (3) Failure of monitoring and alarming systems (4) Professional criminals Theft of museum collections and exhibits (2)
Incapacitation of physical assets Incapacitation of physical assets
Intrusion, misappropriation of physical assets
Misappropriation of museum collections and exhibits Incapacitation of employees
Physical attack against employees (3)
Table 6.15 Threats to physical assets (continued)
THREAT ACTION (FREQUENCY) Employees Accidental damage to museum collections and exhibits (4) Accidental damage to vehicles (4)
Threat Assessment 123
THREAT CONSEQUENCE
Incapacitation of museum collections and exhibits Incapacitation of museum collections and exhibits Misappropriation of museum collections and exhibits Incapacitation, obstruction of monitoring and alarm systems
Theft of museum collections and exhibits (2)
Misconfiguration of monitoring and alarm systems (4) Museum patrons Accidental damage to museum collections and exhibits (3)
Incapacitation of museum collections and exhibits
NIST also describes a complete risk management process whose first step is a risk assessment [NIST800-30]. Steps 3.2 and 3.5 in this process are dedicated to the identification of threats and determination of their likelihood. This publication also uses a likelihood scale of high, medium and low. In making the determination of the likelihood of a threat, this scale also incorporates the existing controls and their capability to neutralize the threat. NIST also separates the identification of threats and the likelihood of their realization into two separate processes. In her publication Security Engineering and Information Assurance, Debra Herrmann describes the need for a complete information security process to identify threats, their type, source, and likelihood [Herr02]. Microsoft describes a threat and countermeasures pattern that offers alternative methods for identifying and assessing threats through Threat Modeling [Mei03]. The authors use a method called STRIDE that categorizes threats based on the goals and purposes of the attacks. The categories that make up the acronym are: spoofing, tampering, repudiation, information disclosure, denial of service and elevation of privileges.
124 6
Enterprise Security and Risk Management
Consequences
This pattern has the following benefits:
The solution provides the enterprise with an understanding of the factors that increase both the existence and the frequency of harmful events. It identifies the consequences incurred should a given threat be realized. The threat assessment is a major component of the risk assessment pattern set that will prioritize and ultimately result in a more secure organization.
It also has the following liabilities:
Accurate historical data may not be available, preventing the enterprise from acquiring useful threat frequency data. The effort required to conceive of all possible threats can be too time consuming for an enterprise. Constraints may therefore have to be placed on the completeness of the threat landscape.