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Vulnerability Assessment 125
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6.4 Vulnerability Assessment
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A vulnerability is a weakness that could be exploited by a threat, causing the violation of an asset s security property. Conducting an enterprise vulnerability assessment helps to identify the weaknesses of the enterprise s assets and the systems that enable access to them, and evaluates the severity if a vulnerability were to be exploited.
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Vulnerability Analysis
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Example
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The museum has begun a risk assessment and identified the following assets to be in scope: Information asset types
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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Physical assets
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Museum building Museum staff Museum collections and exhibits Museum transport vehicles
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The museum has also identified the potential threats to those assets and must now determine vulnerabilities that can compromise those needs.
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Context
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An enterprise has defined the assets to be included in a risk assessment, and has identified potential threats, for example through applying THREAT ASSESSMENT (113). It must now identify the vulnerabilities that can be exploited by those threats.
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Enterprise Security and Risk Management
Problem
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Enterprise assets and the controls protecting them may be fully secure, or may have numerous weaknesses, some of which may never be exploited, and some of which may be exploited every day. Without proper cataloguing of these vulnerabilities, an enterprise might never recognize the extent of the weaknesses of their assets. How can an enterprise identify vulnerabilities to its assets and determine the severity of those vulnerabilities An enterprise must resolve the following forces:
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It might have experience with a single tool or method for discovering weaknesses, but may not be aware of other techniques that can reveal other, potentially critical, vulnerabilities. It need only identify vulnerabilities for which threats exist, and therefore the enterprise must be able to determine if a given vulnerability has an associated threat. It would like to develop a standardized way of identifying vulnerabilities and assessing their severity, in order to be consistent with subsequent vulnerability assessments. The solution should address all assets included in the scope of a risk assessment, including informational and physical assets, and, ideally, should be able to address vulnerabilities in non-IT systems.
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Solution
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Systematically identify and rate probable vulnerabilities of the enterprise assets. This process involves the following five steps: 1. Collect threat information. Collect information on threats. For example, if THREAT ASSESSMENT (113) has been used, appropriate threat information is available from the resulting threat table. 2. Identify vulnerabilities. Using the threat table, identify the vulnerabilities of the assets and the systems protecting them defined in the scope of the risk assessment. 3. Build a threat-vulnerability table. Extend the threat table by associating each vulnerability with a threat action. 4. Create a severity scale. Create a scale for rating the severity of vulnerabilities. This scale will represent the degree to which an asset is susceptible to a vulnerability, and the potential impact should the vulnerability be exploited.
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6.4 5. Rate each vulnerability.
Vulnerability Assessment 127
Rate each vulnerability according to the severity scale and update the threatvulnerability table to reflect this rating.
Dynamics
The allowable sequence for performing the vulnerability assessment process is shown in the figure.
Perform threat assessment
Identify vulnerabilities
Create a severity scale
Build a threatvulnerability table
Rate each vulnerability
Vulnerability assessment sequence constraints
First collect appropriate threat information. Then, using the methods outlined, identify all vulnerabilities and associate them with threats in the threat table, creating the threat-vulnerability table. A vulnerability severity scale can be developed at any time. Finally, using this scale, rate each vulnerability.
Implementation
The implementation of the process for assessing vulnerabilities is described below. 1. Collect threat information. Threat information should include a list of events that could cause harm to assets and provide context for the vulnerabilities.
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Enterprise Security and Risk Management
2. Identify vulnerabilities. Use any of the following methods to identify vulnerabilities exploitable by the threats in the threat table. 2.1. System characteristics. [WT03] describes four main causes of system vulnerabilities, and while it focuses on software applications, the causes can be generalized to help identify weaknesses in non-IT systems.
Those that can be caused by dependency failure. Rarely, if ever, does an application not interact with other applications or systems to perform its function. These interactions may be with database tables, shared system libraries, network services or devices, or operating system resources. The behavior of the application in the event of a failure or unavailability of these dependencies is a prime target for attack. For example, how would an application respond when a security library could not be loaded Does it bypass all security calls, log an error and continue, or halt all operation and alert operators How does an application respond to low system resources such as low disk or memory conditions Those that can be caused by unanticipated data input. The absence of data input validation is a very common mistake. It can also be the most damaging, because the results can range from denial of service to complete subversion of the system through full administrator access. Buffer overflows and SQL injection are two of the most prevalent examples of this class of attack. Those that can be caused by design vulnerabilities. As the size and complexity of an application grows, it becomes more difficult to identify and validate the flow and integrity of data. The potential for exploiting design flaws therefore increases. Such design flaws may include use of cleartext protocols where encrypted ones are necessary, acquiring escalated privileges by circumventing access or authorization controls, assumptions made by designers or developers regarding the use of or operation of the application, and jumping outside the bounds (and constraints) of the system to perform unauthorized tasks or operations. Those that can be caused by implementation vulnerabilities. A most secure design can still lead to a substantial vulnerability if the implementation is faulty. This provides another reason why scale and complexity are impediments to secure systems. The larger and more intricate a design, the more opportunities there will be for implementation errors.