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front of the line referencing the service. An excerpt of an Inetd.conf file is shown here with the echo and chargen services disabled:
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#echo #echo discard discard daytime daytime #chargen #chargen stream dgram stream dgram stream dgram stream dgram tcp udp tcp udp tcp udp tcp udp nowait wait nowait wait nowait wait nowait wait root root root root root root root root internal internal internal internal internal internal internal internal
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Once you have disabled all the unnecessary services, you must restart the inetd program so that it reads the edited Inetd.conf file. Depending on the specific distribution of UNIX or Linux, you might do this by typing killall HUP inetd. The preferred technique for accomplishing a restart of inetd might be different in your specific operating system, so consult your documentation. All of the services listed in the preceding excerpt of the Inetd.conf file are typically used for testing only, and most security guidelines recommend disabling them. In Microsoft Windows operating systems, disabling specific services can be a bit more complex because you need to know which software applications are providing which services. For example, consider the following list (excerpted from Figure 8-3):
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Proto TCP UDP UDP Local Address 10.200.200.153:139 10.200.200.153:137 10.200.200.153:138
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All entries in this list are associated with NetBIOS over TCP/IP services. If you have no need for NetBIOS over TCP/IP services, you can disable them through the Advanced TCP/IP Settings dialog box by clicking the WINS tab, and then choosing the option to disable NetBIOS over TCP/IP, as shown in Figure 8-4.
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Figure 8-4. Disabling NetBIOS over TCP/IP in Windows 2000 In addition to disabling unnecessary services on the clients and server operating systems on your network, you should filter unneeded services at the firewall. As mentioned in 4, you'd be wise to use a default-deny rule on the firewall and enable only needed services. Removing Unnecessary Programs The Melissa virus (described in 6) was targeted at systems running Microsoft Word and Microsoft Outlook. The Melissa virus would not have affected someone who didn't have Word and Outlook installed. The more programs you have installed and running on your system, the greater the likelihood that someone can create or find an exploit for one of your programs.
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To reduce the risk of compromise on your network, you should remove all unnecessary programs from every device on your network. Most operating systems provide a method for you to determine which processes and applications are running. UNIX and Linux systems have the ps command that can be used to list running processes. In Microsoft Windows operating systems released after 1995 (including Microsoft Windows 95, Microsoft Windows 98, Microsoft Windows Me, Windows 2000, and Windows XP) you can hold the Ctrl, Alt, and Delete keys simultaneously to activate the Task Manager. In Windows XP, you can also use the tasklist.exe command to view processes on local and remote computers from the command line. A generic description for a process is a running program. Services, as described previously, are also running programs. In many conversations and documents there is no distinction made between a service
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and a process. However, in this text and others, network services are often generically referred to as services. A process therefore is any running program, whether it is involved with network communications or not. Applications are programs, too, but when many people refer to an application they are talking about a program (or group of programs) that accomplishes a specific task, which might involve one or more running processes. For example, Microsoft Windows games Minesweeper and Solitaire are applications. Here again, the lines are not perfectly clear because when Minesweeper and Solitaire are running on the system they run as single processes. In Microsoft Windows operating systems, you can review installed applications through the Add/Remove Programs icon in the Control Panel. Once you have listed all of the running processes, you can determine if they are necessary. Determining which processes are actually necessary depends on many different factors. Later in this lesson and in the following lesson we cover some of the guidelines that help you determine which processes are necessary. However, beyond all of the recommendations, in many cases, the decision on whether a process is necessary varies depending on what the individual or organization needs to accomplish or provide. Disabling Unnecessary Protocol Stacks As you saw in 2, TCP/IP is a suite of protocols. TCP/IP is often referred to as a protocol stack. Other types of protocol stacks include IPX/SPX and NetBEUI. Many operating systems and network devices are capable of running more than one protocol stack. As with removing an unnecessary service or protocol, you should also remove any unnecessary protocol stacks. For example, the IPX/SPX protocol stack is only used on Novell NetWare networks. However, recent versions of NetWare frequently use TCP/IP. If you convert your network to TCP/IP completely, you can remove IPX/SPX from hosts and routers on your network. The fewer protocols, protocol stacks, and services that your systems support, the less likely it is that newly discovered vulnerabilities will affect them. At a minimum, removing unnecessary services, protocols, and protocol stacks improves performance and makes systems less complex to troubleshoot. Disabling Promiscuous Mode Attackers who are able to compromise one of the systems on your network might use that compromised system to gather information and possibly exploit other systems. One way in which an attacker might gather information is to install a protocol analyzer program on the compromised system. The attacker then uses the protocol analyzer to monitor data packets, hoping to find passwords, user names, or additional information that might help to compromise other systems.
To protect your systems from this type of attack, you must do all you can to ensure that a system is not compromised in the first place. However, if a system is compromised, one method for stopping the attacker from gathering additional information is to disable the promiscuous mode of the network card. Promiscuous mode is a condition that a network adapter can be placed in to gather all passing information. Normally, network adapters do not gather information that is not specifically destined for the adapter or broadcast to all adapters. Certain programs (such as protocol analyzer programs) place adapters into promiscuous mode. Many network card manufacturers provide directions for disabling promiscuous mode through various operating systems. Unfortunately, if the attacker is savvy enough to compromise the system and gain full control (root, superuser, or administrative access), then he or she can probably re-enable promiscuous mode on the adapter through the operating system. Some network card manufacturers make network
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