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IDS can be software loaded on a system that monitors network traffic, or it can be a hardware device Intrusion detection systems can be either active or passive An active IDS will monitor activity, log any suspicious activity, and then take some form of corrective action For An active IDS is also example, if a system is doing a port scan on the known as an intrusion prevention network, the IDS may log the activity but also system (iPs) disconnect the system creating the suspicious action from the network A passive intrusion detection system does not take any corrective action when suspicious activity has been identified The passive IDS will simply identify the activity and then log to file any information needed during an investigation The passive IDS does not take any corrective action
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A number of people believe that if they have a firewall they are safe from network attacks a belief that most hackers hope for The firewall can help protect us against data or services that we have not requested, but what about services that we ask for, such as e-mail Hackers can attack the system by sending an e-mail that includes an attachment, hoping you open the attachment, which will then attack your system This is why it is so important that you not open or run any program from an e-mail whose source you are not familiar with It is important to note that most vendors, including Microsoft, will never send you an e-mail with an attachment to download Microsoft has stated that they will send you the URL of a file and downloading it is up to you I have received e-mails in the past that appeared to be from Microsoft asking me to run updateexe, which was attached to the e-mail The hacker doing this was very smart, because the e-mail used the look and feel of the Microsoft site so that it appeared to actually come from Microsoft The e-mail stated that updateexe would fix a security vulnerability within the operating system, but I knew better and did not run updateexe! An important part of securing your system is to make sure that you are constantly updating your virus definitions so that your system can protect you from any new known viruses
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Along the lines of updating virus definitions, you will want to make sure that you keep up-to-date on operating system patches and product updates For example, if you are running a Windows server along with Exchange Server and SQL Server, you must certainly test and apply any patches or updates for each of the products This is a highly critical step to perform! About a year ago I was asked to do a security audit on a hotel During the audit I plugged into a network jack that was available to guests in the hotel Once I got the IP address, I typed a few Microsoft commands such as net view /domain and saw the domain for the corporate network! I also performed the kaht2 hack described in 11 on the server and was connected to the server instantly So within 45 seconds I went from knowing nothing about their network to potentially taking full control of it Needless to say, the hotel failed the audit! The lesson here is that the network consultant who configured the network violated every best practice First, the hotel guest network should never be connected physically to a corporate network If there is a physical connection, there may always be a way to get access to the data Second, the server was installed but had never had an update or patch applied to it! If the administrator had run Windows Update on the server, the RPC exploit would not have been successful The bottom line here is that you must constantly update your antivirus software and apply any fixes or patches for your server operating systems and network devices These fixes are provided because of flaws in the products, and hackers are aware of these flaws and use them to gain control of your network Deny them the opportunity by taking the flaw away! Exercise 12-7 shows how you can delete a file from an unpatched Windows 2000 Server through what is known as the dot dot attack typed in the URL of the browser What is important about this exercise is that a lot of people put their web servers behind a firewall and don t bother doing a Windows update because they figure the system is secure behind the firewall This attack shows you that the HTTP request will most likely pass through your firewall You want to publish a web site, but because the system is not patched, anyone in the world can delete files on the server
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