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Malware The Internet is the conduit through which virtually all malware travels Whether it is transmitted in spam, hidden in downloadable software programs, or embedded in web sites, the designers of malware know that the Internet is the way to travel fast and cheap Botnets use IRC (Internet relay chat) and HTTP protocols to control their bot armies, as well as to spread spam or attack target systems Masquerading An attacker can forge messages that have the appearance of originating elsewhere The TCP/IP protocol itself does not enforce the value in the From IP address field in any packet, which makes it easy to send messages to a target system that have the appearance of originating from anywhere Similarly, the SMTP (Simple Mail Transport Protocol) performs no enforcement on the From address in any e-mail message, a fact that has contributed to the spam problem Many other protocols have similar weaknesses in their design Denial of Service A denial of service (DoS) attack is an attack on a target system with the intent of causing it to cease functioning There are two principal ways to perpetrate a DoS attack; first, it can be carried out by sending an enormous volume of messages to the target system in order to flood its input buffers and exhaust its available resources The second method is to send a specially built message that is known to cause a service or application running on the target system to malfunction or stop running altogether Another form of a DoS attack is known as a distributed denial of service (DDoS) attack, a flooding attack that originates from a large number of systems simultaneously Fraud Many kinds of fraud are perpetrated on the Internet against systems and people In a fraud attack, the attacker is pretending to be someone or something else (a merchant, bank, or government entity, for instance) and is attempting to trick the target into performing an action, such as transferring money or providing private information NOTE One topic not covered in this section is the variety of reasons and motivations behind attacks on systems This subject is covered in detail early in this chapter
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A wide variety of countermeasures are needed to protect an organization from the assortment of threats The countermeasures described in this section should begin to
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The protocols at the base of the Internet, TCP/IP, were developed a generation ago by designers who assumed that TCP/IP would always be operated on controlled, closed networks The basic design of most of the protocols and services in use on the Internet today assume that all other parties can be trusted For this reason, the designers of TCP/IP never built in controls to prevent one system from masquerading as another It is this design principle that has permitted the proliferation of much spam, malware, and other malevolence on the Internet
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look familiar if you are reading through this chapter from beginning to end; the countermeasures used to protect Internet-based threats are not much different from those protecting similar threats in other contexts Network- and computer-related security countermeasures discussed elsewhere in this book would often apply when any network, system, or application is opened to the Internet The Internet represents the worst-case security scenario for any system or application, as this exposes it to the most potent threats that exist Firewalls Firewalls are devices that control the flow of messages between networks Placed at the boundary between the Internet and an organization s internal network, firewalls enforce security policy by prohibiting all inbound traffic except for the specific few types of traffic that are permitted to a select few systems For example, a firewall will: Permit incoming e-mail to be sent only to the organization s e-mail server Permit incoming HTTP requests to be sent only to the organization s Internetfacing web server Permit incoming file transfer requests to be sent only to the organization s file transfer gateway Permit outbound e-mail to originate only from the organization s e-mail server The last item in the previous list points out that firewalls control not only what comes in to an organization s network, but also what leaves an organization s network This last control, permitting outbound mail to originate only from the e-mail server, prevents malware from originating its own e-mail messages, thereby slowing down the spread and impact of some types of malware Intrusion Detection Systems An intrusion detection system (IDS) is a detective control that is designed to listen to network traffic and generate alerts if it sees any messages that match a database of attack signatures IDSs are discussed in more detail earlier in this chapter in the section Network Security Honeypots and Honeynets A honeypot is a trap that is designed to detect unauthorized use of information systems A honeypot will have the appearance of containing important information and of being unprotected and unmonitored When an attacker attacks and takes over a honeypot, this provides information to the organization that will help it learn how to better protect its real production computers A honeypot helps an organization better understand two important facts: Which attackers are sufficiently interested in the organization s information to launch an attack against it Which tools and techniques are used by the attacker(s)
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