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The applications and operating systems that are installed on our computers are developed by people like you and me and will most likely have mistakes programmed into them along with the great features of the application that we see every day These mistakes (known as vulnerabilities) that are left in the program code can be found by individuals who then take over your system or network by exploiting that vulnerability! This is known as a network attack, or system attack, depending on whether the entire network was taken over or just a single system A number of network attacks can be prevented because the manufacturers of the software and operating systems are always looking for the vulnerabilities in their code They then fix those mistakes and ship the fixes in what is known as a fix or update You will normally acquire these fixes and updates through the manufacturer s web site For example, Microsoft operating systems have a Windows Update program item in the Start menu to go to the company s update web site and scan your system for any updates that need to be installed This feature is known as Windows Update and may be run from choosing Start | All Programs | Windows Update, as shown in Figure 11-4 After Windows Update determines the updates, or fixes, that are needed on your system, your system will download the updates from the Windows Update site There are various types of updates that will be delivered to you through the Windows Update site They are listed as follows:

The floodguard command is used to prevent a DoS attack on the PIX's authentication processes Each request for user authentication consumes resources on the PIX If the number of resources used by the user authentication subsystem becomes too great, it is possible that the PIX will stop functioning To remedy this possibility, if the user authentication subsystem runs out of resources, the PIX will actively begin reclaiming TCP user resources This feature is enabled by default We recommend that you leave this feature enabled It can be disabled with the command: floodguard 0

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A security hot-fix is a critical security update that should be applied to your system as quickly as possible because the vulnerability opens the system to serious security risks A patch is a fix to a particular problem in software or operating system code that does not create a security risk but does create problems with the system or the application A service pack is all updates for a product, including patches and security hot-fixes, from the time the product was released up to the time of the service pack If you install a service pack, you will not need to install each patch individually, because the service pack includes all updates up to that point in time You will need to install patches and security fixes that come out after the service pack

figUre 11-4

In this exercise you will run Windows Update to bring your Windows Server system up-to-date in order to help protect the system from known vulnerabilities Windows 2000 Server is used in this example because there are a number of exploits against it The point of the exercise is to show you that once the system is patched the exploit no longer works Before patching the system you will first download and leverage an RPC exploit known as kaht2 that will allow you to connect to the Windows 2000 Server as

Fully Meshed Topology This is the ultimate in resiliency, minimizing the number of intermediate routers through which traffic must pass, and reducing the amount of traffic on each link The obvious drawback is the cost of all the leased lines There are very few situations that justify a fully meshed network, because just adding one more distribution center to the backbone takes up significant resources in terms of router ports at each location A fully meshed network is shown in Fig 7-4

Now that we have covered each of the default commands, we return to our earlier statement that the basic PIX configuration requires only six commands These commands are covered in the following three steps: 1You must configure an IP address on the inside and outside interfaces Once this is done, you should verify that the interfaces are up and running by pinging a device on the inside and outside interfaces from the PIX using the ping command ping inside 10111

11:

the operating system account and take full control of the unpatched system After verifying that you could connect to the unpatched system, you will then patch the server by running Windows Update and trying the exploit again the second time you will be unsuccessful because the system has been patched Please note that it is illegal to gain unauthorized access to another system, network, or device this lab is for educational purposes only and is designed to show the importance of patching a system

1 On your Windows XP system, download the kaht2zip file from http://www securityfocuscom/bid/8205/exploit (as shown in the following illustration) Once you have downloaded the Zip file, extract it to c:\labfiles\tools\kaht2

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