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Removing Nonessential User IDs Exploiting access privileges is one of the easiest techniques available to system hackers for breaking in to a target system Often, a system can be compromised by attacking nonessential user IDs, such as guest accounts Every user account that does not serve a specific purpose should be disabled or removed Some types of systems require the presence of special accounts, even though they may not be required for interactive login System engineers should look for a way of preventing interactive logins for these types of accounts without crippling the services that use them NOTE The use of more advanced authentication technologies, such as twofactor authentication or biometrics, may make it far more difficult for an intruder to successfully attack target systems through user ID and password guessing Reducing User Privileges The privileges required by each end user should be reduced to only those privileges necessary for each user to perform their tasks Similar to the principle of reducing privilege levels for system services and applications, user privileges should be reduced so that the user is not permitted to perform any functions beyond what is required of them This is similar to the principle of least privilege that is discussed earlier in this chapter Reduce or Eliminate Interserver Trust Some operating systems, such as Unix and Linux, can be configured to trust users on other systems Some of these trust arrangements (such as rlogin) assume the integrity of other systems and are vulnerable to attack For this reason, interserver trust should be used with care Single sign-on (SSO), when configured properly, is considered reliable and need not be eliminated based on the principle of removing interserver trust However, even modern SSO and other authentication services must be designed and implemented securely to avoid misuse and attack NOTE System and device hardening has been a topic of discussion and innovation over the past three decades Consequently, there are many good sources for hardening guidelines and instructions, including US-CERT, NIST, and SANS
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Managing login credentials for end users (as well as for automated processes) requires that user accounts be managed in a highly consistent, organized manner Because login credentials are often the only barrier between intruders and sensitive or valuable information, the consequences of poor security access management can be devastating
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6: Information Asset Protection
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The processes associated with user access are user access provisioning, user access termination, and user transfers Each is discussed here
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This is the process whereby user accounts are created for new employees or contractors This activity should utilize a formal, documented access request and approval process that specifies who is authorized to request user accounts, who is authorized to approve access requests, and how (and which) activities are recorded Requests for administrative or privileged access may require additional approvals The reason for this is that administrative and privileged accounts have higher risks associated with them (the potential for damage is directly proportional to the level of privilege) User access provisioning occurs at the time of hire for new employees, but it also occurs when individual (or groups of) employees require additional access to applications or access to new applications The process of vetting each account should address the following items: Is this person still actively employed and in good standing Does this person require this access to perform their duties Does the business owner of the system approve access A great deal of care is required in this process The risk of errors can be devastating for an organization: The worst-case scenarios involve unauthorized insiders or outsiders having access to highly sensitive or valuable information The practical effects of an error in user access management can be as grave as a hacking incident where an attacker is able to break in to a computer system to steal sensitive information
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