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Exchange 2000 Server provides an Instant Messaging feature that is essentially a private ver sion of the MSN Messenger Service. This feature must be enabled on both a global basis and a per-user basis. Note Exchange Server 2003 does not include the instant messaging component. Microsoft Live Communications Server 2003 takes the place of the instant messaging functionality in Exchange 2000 Server for Exchange Server 2003 environments. For more information about Live Communications Server, see www.microsoft.com/office/preview/ livecomm/default.asp. To enable Instant Messaging in Exchange 2000 Server, follow these steps:

At the Transport layer, either a UDP header is added to the message or a TCP header is added. The application that is requesting the service determines what protocol will be used. Some of the ways the Transport layer can be exploited to compromise the C-I-A triad include the following: Manipulation of the UDP or TCP ports. By knowing the UDP and TCP header fields and lengths, the ports that are used for communications between a source and destination computer can be identified, and that information can be corrupted or exploited. DoS. With a DoS attack at this level, simple IP-level protocols and utilities can be exploited to overload a computer, thus breaking the C-I-A triad. For instance, by knowing the steps involved in a three-way TCP handshake, a hacker or cracker might send the packets in the incorrect order and disrupt the availability of one of your servers. An example of this is a SYN flood, where a hacker sends a large number of SYN packets to a server and leaves the session half open. The server leaves these sessions half-open for a prescribed amount of time. If the hacker is successful in opening all available sessions, legitimate traffic will be unable to reach the server. Session hijacking. This kind of attack occurs after a source and destination computer have established a communications link. A third computer disables the ability of one the computers to communicate, and then imitates that computer. Because the connection has already been established, the third computer can disrupt your C-I-A triad.

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Messaging is optional when you install Exchange. You can install it later, as shown in Figure 36-20, but the Exchange services will be stopped during the installation process.

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Figure 36-20. Instant Messaging is an option when Exchange Server is initially installed; you can add it later from the Exchange Server CD.

Identifying Possible Application Layer Attacks Application layer attacks can be some of the most difficult to protect against because they take advantage of vulnerabilities in applications and lack of end-user knowledge of computer security. Some of the ways the Application layer can be exploited to compromise the C-I-A triad include the following: E-mail application exploits. Attachments can be added to e-mail messages and delivered to a user's inbox. The user can open the e-mail message and run the application. The attachment might do immediate damage, or might lay dormant and be used later. Similarly, hackers often embed malicious code in Hypertext Markup Language (HTML) formatted messages. Exploits of this nature might take advantage of vulnerability in the client's e-mail application or a lack of user knowledge about e-mail security concerns. Web browser exploits. When a client computer uses a Web browser to connect to a Web server and download a Web page, the content of the Web page can be active. That is, the content is not just static information, but can be executable code. If the code is malicious, it can be used to disrupt the C-I-A triad. FTP client exploits. File Transfer Protocol (FTP) is used to transfer files from one computer to another. When a client has to provide a user name and password for authentication, that information can be sent across the Internet using plain text. The information can be captured at any point along the way. If the client uses the same user name and password as they use to attach to your corporate servers, that information could be obtained by a hacker or cracker and used to access your company's information.

the server on which you want to create the Instant Messaging virtual server. Click Pro tocols, and then click Instant Messaging (RVP).

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