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Experienced network security analysts know that it s wise to know how individuals may intrude networks or perform unauthorized actions. When designing security policies, you should always think about which gaps are being left open. Also, it s tempting to implement security through obscurity. For example, one might set up a server with an IP address that is unlisted in DNS and other name resolution services. The administrator may think that this server is fairly secure, because few people will know that the machine is there. However, there are several tools and tactics that hackers can use to find it: w Network analyzers Also called sniffers, these devices can monitor and intercept raw data packets that are traveling on your network. This includes password information (hopefully encrypted) and all data transfers. Password-breaking tools Tools that test files against a dictionary of common passwords can be used to attempt to break into accounts. As a systems administrator, it s a good idea to routinely use these tools on your own accounts database to identify user accounts with weak passwords. Impersonation Perhaps the best way to get a user s password is to call him or her and say that you re calling from the IT department and need their password to make changes to their e-mail account. Exploiting known bugs Many hacks are performed after information on bugs or security flaws are discovered and publicized. Usually, there are patches or configuration workarounds that can reduce the risk of these attacks. It s important for systems administrators to find out about the latest security breaches as soon as possible. Later in this chapter, we ll look at some good resources for keeping on top of security issues.
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An often-overlooked area of security concerns protecting your critical business systems physically. There is very little that can be done if someone simply walks away with one of your servers or even a laptop that has sensitive business information stored on it. Of course, most businesses have security guards and locked rooms in place to protect against these actions. It is worth noting, however, that just as with any other security technique, you should maintain the maximum amount of security available without hindering usability. Usually, systems and network administrators will have access to server rooms and wiring closets. If possible, access to these areas should be logged, and pass codes should be changed frequently. IT staff should also understand that it is their responsibility to make sure that these areas remain secure and that pass codes or other secret information is not given out. With adequate physical security in place, you can move on to protecting your data from those that try to get to it from your network.
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To properly manage your network, it is necessary to give all users (including Administrators) sufficient permissions to carry out their tasks. It is also important to restrict access to tools that they do not use or should not have access to. Here, we ll look at some of the features for restricting access included with Windows NT. User rights can be used to restrict the functions that can be performed by users with above-normal user permissions. For example, in Windows NT User Manager, an Administrator can restrict the workstations that a user may log on to:
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This feature may be useful if you have a set group of users who share machines, but you do not want these people to log on to other computers. To prevent the loss of data, all network operating systems feature a user account or a group from which all rights are inherited. In Windows NT, this is the Administrators group. Managing permissions for Administrator accounts is particularly important. Many organizations set up a single user account as the Administrator and give several people the Administrator password. However, this poses several major security problems.
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First of all, if more than one user can log on to the system as the Administrator, the possibility of accountability provided by auditing is made very difficult. For this reason, it is recommended that all users be given separate accounts.
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