Small Business Considerations in VS .NET

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Small Business Considerations
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Microsoft applications and platforms must go through to ensure that it is built with security in mind. Thus, when that platform ships, it has already gone through an acceptable risk assessment. It was designed to build and implement a multi-role server for a small organization that will provide the proper balance of being secure while catering to small business needs, and is the only server solution able to mitigate the risk of the edge role placed on the same server. The argument could be made that Windows Essential Business Server, Microsoft s mid-market platform, does the same for a three-server deployment. Both products give you a base secure server to then build secure network solutions on.
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Edge Server Issues
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The key element in all of these multi-role but not multi-server deployments is to review what you need or want to put on the edge. Review the needs of the organization to protect that edge and deploy a solution accordingly. That solution could be an ISA firewall able to review the packets entering the network, a cheap third-party firewall appliance, or an inexpensive ISA-based hardware firewall. Regardless of the device on the edge of your network, it is strongly recommended that you review the manner in which it logs traffic across that connection. If you read 8, Auditing, and did not get the idea that auditing is important, go back and read that chapter again. When and please note the use of the word when and not if a security incident happens to an organization, you will not have a complete picture of how things entered and left your organization without that edge device logging the activity. It does not matter whether that organization is a large corporation with an on-site forensic team or a small organization who will be calling Microsoft s Customer Support Services security division and asking them to perform a Windows Online Forensic analysis. Furthermore, the solution you place at the edge can assist in your attack-mitigation posture by having such policies as only allowing e-mail from the mail server and blocking all e-mail from any internal workstations (to prevent workstation zombies).
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Proactive Internet and Access Policies
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While you are setting up policies to limit Internet access, consider also proactively limiting what workstations can do on the network that they should not be able to do. For example, in a typical network, a workstation should not be sending out traffic on port 25. If it is, it has probably been turned into a spam zombie. But you can take proactive steps to prevent this traffic. Figure 15-8 shows a sample restriction rule done on ISA Server.
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Figure 15-8 Using ISA Server to assist in setting edge policies.
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Part III:
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Common Security Scenarios
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The sample policy looks like this:
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Action: Deny, log request Protocols: Selected: SMTP From: The LAN (a defined IP address range of the workstations, but excluding the Server, Printer, and scanner IPs, which are specifically defined and excluded in the DHCP server range) To: Anywhere Users: All Schedule: Always
Be Proactive Not Reactive
Small businesses tend to initially not care much about restrictions on Internet use and thus the usual design of network access is to let all authenticated workstations have full Web access. Later on, the business owner begins to realize that employees are spending too much time on social networking Web sites or spending too much time instant messaging their friends. Thus, typically you are later asked to limit Internet access not proactively, but reactively because of this non-business use. Your best security solution will always be proactive and not reactive. Try to anticipate the threats accordingly. If you have ever scanned comments in an online security community, you have probably noticed that one recommendation is to move services to alternative ports as a best practice. For large organizations, this step has little or no value because the attackers will be looking for unusual traffic no matter what port it is on. In a small organization, it can add some benefit, but in general, minimize as best as you can the ports that respond externally.
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