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Types of Security Threats
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To implement security effectively, corporations as well as individuals need to be aware of a variety of potential threats. Let s take a look at each these threats.
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Each of the following threats does not necessarily require direct human interaction. Through the use of computer viruses or Trojan Horse applications, data can easily be destroyed, manipulated, or sent to an intruder for viewing.
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Unauthorized Disclosure of Data
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Unauthorized disclosure of data results from an individual accessing or reading information and revealing it either accidentally or intentionally. Corporations and individuals are making greater use of networks, including private networks such as local area networks (LANs) and wide area networks (WANs) and public networks such as the Internet. As a result, some of the data stored or processed on the network may require some level of protection to ensure confidentiality. Network data or software may be compromised when it is accessed, read, and possibly released to an unauthorized individual. A common cause of unauthorized access is the failure to encrypt sensitive information. Data can be compromised by exploiting the following types of vulnerabilities:
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Storing data in the clear (i.e., unencrypted) when it is considered sensitive enough to warrant encryption Failing to implement, monitor, and enforce appropriate authorization and access-control mechanisms where sensitive data is stored
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Unauthorized Modification of Data
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Information in digital form is often shared between many users and stored on numerous shared devices. The unauthorized modification of data includes the modification, deletion, or destruction of data or software in an unauthorized or accidental manner. A particularly insidious event is data modification that goes undetected. When such modifications are present for long periods of time, the modified data may be spread throughout the network, possibly corrupting databases, spreadsheet calculations, and other forms of application data.
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This kind of damage can compromise the integrity of application information. When undetected software changes are made, all system software can become suspect, warranting a thorough review (and perhaps reinstallation) of all related software and applications. These kinds of unauthorized changes can be made in simple command programs (for example, in PC batch files), in utility programs used on multiuser systems, in major application programs, or in any other type of software. They can be made by unauthorized outsiders as well as those who are authorized to make software changes (although not, of course, the damaging changes we are speaking of here). These changes can divert information (or copies of the information) to other destinations, corrupt the data as it is processed, and impair the availability of system or network services. The unauthorized modification of data and software can easily take place when data integrity services are not provided.
Unauthorized Access
Unauthorized access occurs when someone who is not authorized to use a system or network gains access, usually by posing as a legitimate user of the network. Three common methods are used to gain unauthorized access: password sharing, general password guessing, and password capture. Password sharing allows an unauthorized user to assume the network access and privileges of a legitimate user with the latter s knowledge and acceptance. General password guessing is not a new means of unauthorized access. In password capture, a legitimate user is tricked into unknowingly revealing his or her login ID and password. Methods of password capture include the use of a Trojan Horse program. To a user, this program looks like a legitimate login program; however, it s designed solely to capture passwords. Another method used to ultimately gain network access is to capture a login ID and password as they are transmitted across the network unencrypted. A number of methods for capturing cleartext network traffic, including passwords, are readily available. Intruders can gain unauthorized network access by exploiting the following types of vulnerabilities:
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