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Doing It Wrong: The Break-Ins
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Lack of, or insufficient, identification and authentication schemes Password sharing The use of poor password management or easy-to-guess passwords Failure to patch known system holes and vulnerabilities The storage of network access passwords in batch files on PCs Lack of a time-out for login and log-off attempts
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Disclosure of Network Traffic
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Many users realize the importance of protecting confidential information when it is stored on their workstations or servers; however, it s also important to maintain confidentiality as the information travels across the network. The disclosure of network traffic occurs when someone who is unauthorized reads, or otherwise obtains, information as it traverses the network. Intruders can easily compromise network traffic by listening to and capturing traffic transmitted over the network transport media. Examples of attack methods include tapping into a network cable with the use of a hardware device that analyzes network traffic as it is transmitted. Traffic analyzing software, or sniffers, allow intruders to access the network the traffic is traversing. One such application is Sun Microsystems snoop utility, which was originally created to allow administrators to verify traffic flow across the network. But it also allows intruders running the Solaris operating system to watch the flow of network traffic. Information that can be compromised in this way includes system and user names, passwords, electronic mail messages, application data, health records, and so on. For example, even if patient records are stored on a system in an encrypted form, they can be captured in plaintext as they are sent from a workstation or PC to a file server. Electronic mail message files, which usually have strict access rights when stored on a system, are often sent in plaintext across a wire, making them an easy target for capturing. Disclosure of network traffic is usually the result of data sent in the clear, across both public and private networks.
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It s a basic principle of network security that data that is transmitted over a network should not be altered in an unauthorized manner either by the network itself or by an intruder as a result of that transmission. Network users should have a reasonable expectation that any messages they send will be received unmodified. A modification occurs when an intentional or unintentional change is made to any part of the message, including the contents and addressing information. Spoofing of network traffic involves (1) the ability to receive a message by masquerading as the legitimate receiving destination or (2) masquerading as the sending machine and sending an unauthorized message to a destination. For an attacker to masquerade as a receiving machine, the network must be persuaded that the destination address is the legitimate address of the machine. (Network traffic can also be intercepted by listening to messages as they are broadcast to all nodes.) To masquerade as the sending machine and deceive a receiver into believing the message was legitimately sent, attackers can masquerade the address or mount a playback attack. A playback involves capturing a session between a sender and a receiver and then retransmitting the message (with either a new header, new message contents, or both). Intruders can spoof or modify network traffic by exploiting the following types of vulnerabilities:
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Transmitting network traffic in plaintext Lack of a date/time stamp (showing sending time and receiving time) Failure to use message authentication codes or digital signatures Lack of a real-time verification mechanism (to use against playback)
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Identifying Intruders
Every day, undesirable intruders make unauthorized entry into computer systems and networks. Who exactly are the intruders These individuals range from recreational hackers to foreign intelligence agencies. Each of these groups has its own agenda and motivations. The following sections paraphrase the descriptions of various intruders that were noted in a recent Federal Bureau of Investigation Congressional statement titled Cybercrime.
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