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Another very common dependency in a network is based on the software distribution system. Very often a single server or a set of Distributed File System (DFS) shares are used to distribute software to computers within the network. If an attacker compromises the server(s) that host the software, all computers that receive software from it are potentially compromised.
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The operational dependency has created an access-based dependency on the software distribution servers.
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As you may have noticed by now, the boundaries between the different kinds of dependencies are not always clear, and a single dependency can belong to several categories. For example, a service account used on multiple computers is both a service account dependency and an administrative dependency. The idea behind classifying the dependencies is simply to facilitate thinking about them. One type of dependency is not inherently far worse than another. Individual instances of dependencies might be more or less severe, but that is because of the facts of that instance, not the category of dependency it belongs to. Use the categories as a guideline to help you think about your network, not as a forced framework to plug things into. If you find a different taxonomy to be more useful, use that instead. The only rule here is that everything you do should improve the security of your network.
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Finally, many pages into the chapter, we get to the part about how to solve the problem. It has taken this long because the concepts we have discussed so far are barely touched on in the vast majority of security literature, which often does not even mention these issues. One of the most important techniques for mitigating security dependencies today involves isolating computers that do not need to communicate so that they cannot do so. Microsoft calls this Server and Domain Isolation. To build a strategy to do so is best done in a step-wise process: 1. Define a classification scheme. 2. Model your network. 3. Analyze your network model relative to the classification scheme. 4. Revise the classification scheme as needed and reanalyze. 5. Define an isolation strategy consistent with your risk management strategy. 6. Derive an operational strategy from your isolation strategy. 7. Build a server implementation based on your isolation strategy. These seven steps are quite a bit more complicated than they might seem. The key is to realize that this is not a single-afternoon project. You really need a far better handle on the structure and usage patterns in your network than what most organizations have. In fact, if you get no further than simply understanding your network better, you have created significant value. The remainder of this chapter discusses how to use these concepts to design and implement a Server Isolation strategy.
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Common Security Scenarios
Before we go any further, it is important to better define the term Server Isolation. When Microsoft first coined the term, it was in conjunction with the term Domain Isolation. Domain Isolation simply meant that to communicate with any domain member (with some exceptions) you had to be a domain member. This type of isolation is quite simple and, while valuable, leaves rather large holes by assuming that all domain members are good and nice. Server Isolation is the next step. In Server Isolation each server has its inbound traffic restricted, usually using IPsec, so that only the traffic necessary for the server to fulfill its business purpose is permitted. This provides very good isolation indeed. When Microsoft and other customers started implementing these isolation mechanisms they discovered that while Domain Isolation was simple in concept, implementing Server Isolation was far easier because IPsec was very difficult to work with in a large network. Therefore, they generally started with Server Isolation. However, what most observers fail to recognize about Server Isolation is that every Windowsbased computer is a server. Every workstation also runs the Server service by default, and if you do not restrict inbound traffic or even if you use Domain Isolation you will have a network where every client can attack I mean communicate with every other client. Therefore, do not forget to include clients in your Server Isolation strategy.
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