Xem 1-20 trên 20 kết quả Network intruders
  • Hacking - showing computer expertise Cracking - breaching security on software or systems Phreaking - cracking telecom networks Spoofing - faking the originating IP address in a datagram Denial of Service (DoS) - flooding a host with sufficient network traffic so that it can’t respond anymore Port Scanning - searching for vulnerabilities

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  • Intrusion detection is not for the faint at heart. But, if you are a network administrator chances are you're under increasing pressure to ensure that mission-critical systems are safe--in fact impenetrable--from malicious code, buffer overflows, stealth port scans, SMB probes, OS fingerprinting attempts, CGI attacks, and other network intruders.

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  • Attackers can infect your computer with malicious software, or malware, in many different ways. They can take advantage of unsafe user practices and flaws in your computer’s programs (flaws including vulnerabilities and unsecured services and features) and use social engineering (in which an attacker convinces someone to perform an action such as opening a malicious email attachment or following a malicious link). Once your computer is infected, intruders can use the malware to access your computer without your knowledge to perform unwanted actions.

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  • Intruders Intrusion Techniques Password Protection Password Selection Strategies Intrusion Detection Viruses and Related Threats Malicious Programs The Nature of Viruses Antivirus Approaches Advanced Antivirus Techniques Recommended Reading and WEB Sites

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  • In CERTs 2001 annual report it listed 52,000 security incidents the most serious involving: IP spoofing intruders creating packets with false address then taking advantages of OS exploits eavesdropping and sniffing attackers listen for userids and passwords and then just walk into target systems as a result the IAB included authentication and encryption in the next generation IP (IPv6)

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  • Network Security: Chapter 9 - Intruders presents about Intrusion Techniques, Password Guessing, Password Capture, Intrusion Detection, Approaches to Intrusion Detection, Audit Records, Statistical Anomaly Detection, Audit Record Analysis.

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  • OpenSSH is an open-source implementation of the SSH (Secure SHell) protocols, originally developed in 1995 by Tatu Ylönen. SSH-based tools provide secure client/server connections and are usually designed to replace older remote-access tools like rsh and telnet. Unlike their predecessors, SSH-based tools encrypt their transmissions, making it difficult or impossible for intruders to “sniff” important information, such as passwords, from the data stream. SSH implementations exist for every major platform including Microsoft Windows. This paper will focus on the OpenSSH implementation....

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  • Impersonation is closely related to unauthorized access but is significant enough to be discussed separately. Impersonation is the ability to present credentials as if you are something or someone you are not. These attacks can take several forms: stealing a private key or recording an authorization sequence to replay at a later time. These attacks are commonly referred to as man-in-the-middle attacks, where an intruder is able to intercept traffic and can as a result hijack an existing session, alter the transmitted data, or inject bogus traffic into the network.

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  • Many of these attacks are now either semiautomatic or completely automatic. In semiauto- matic DDoS attacks, the intruder typically uses automatic tools to scan and compromise vulnerable machines and infect these machines with the attack code. At some later time, the machines with the attack code are used to launch a widely distributed attack. Even more problematic are the completely automatic attacks, where the need for later communication with attack machines is bypassed.

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  • However, risks are inherent in any wireless technology. Some of these risks are similar to those of wired networks; some are exacerbated by wireless connectivity; some are new. Perhaps the most significant source of risks in wireless networks is that the technology’s underlying communications medium, the airwave, is open to intruders, making it the logical equivalent of an Ethernet port in the parking lot. The loss of confidentiality and integrity and the threat of denial of service (DoS) attacks are risks typically associated with wireless communications.

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  • The security architecture should be developed by both the network design and the IT security teams. It is typically integrated into the existing enterprise network and is dependent on the IT services that are offered through the network infrastructure. The access and security requirements of each IT service should be defined before the network is divided into modules with clearly identified trust levels. Each module can be treated separately and assigned a different security model.

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  • In this example, the intruder gains access to username/password information and sensitive routing protocol data using an Ethernet packet decoder such as EtherPeek. The data packets being sent are captured by the laptop running EtherPeek; the program decodes the hex data into human-readable form. After obtaining access to information, the intruder can use this information to gain access to a machine and then possibly copy-restricted, private infor- mation and programs.

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  • In this example, the intruder was connected to a corporate LAN and did a lot of work with another researcher on a different LAN. The backbone was set up in such a way that it took five hops and a 56-kbps line to get to the other research machines. By capturing routing information and having enough knowledge to change the routing metric information, the intruder altered the path so that his access became seemingly better through a backdoor connection.

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  • In sending and receiving messages, parties are often interested in three prop- erties of the communication other than confidentiality. Integrity means that the sender and receiver should be able to verify that a message has not been modified in transit. As a consequence, this means that an intruder should not be able to sub- stitue a false message for a legitimate one without being detected. Authentication means that the receiving party should be able to ascertain the origin of a message.

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  • DoS attacks are particularly malicious because although they do not provide intruders with access to specific data, they “tie up” IS resources, preventing legitimate users from accessing applications. They are usually achieved by hackers sending large amounts of jumbled or otherwise unmanageable data to machines that are connected to corporate networks or the Internet. Even more malicious are Distributed Denial of Service (DDoS) attacks in which an attacker compromises multiple machines or hosts.

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  • If we lived in a static world, developing effective solutions for known attacks might be achievable over time. However, in today's complex cyber business environment, there is no static state. Too often, attackers are ahead of the curve, continually innovating effective attack strategies and schemes, while security professionals and enterprise IT continue to struggle to keep pace with malicious developments. Today's enterprise threat environment has evolved and exploded into an assortment of blended attack vectors that effectively work in concert to breach existing security defenses.

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  • What is Intrusion? E.g. Malice gets Alice’s user name & password and impersonates Alice Intruders are attackers who obtain login information of legitimate users and impersonate them

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  • The ease or difficulty of packet snooping (also known as eavesdropping) on networks depends largely on the technology implemented. Shared media networks are particularly susceptible to eavesdropping because this type of network transmits packets everywhere along the network as they travel from the origin to the final destination. When concentrators or hubs are used in a shared media environment (such as FDDI, 10BASE-T, or 100-Mbps Ethernet), it can be fairly easy to insert a new node with packet-capturing capability and then snoop the traffic on the network.

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  • This authoritative guide will help you secure your Linux network--whether you use Linux as a desktop OS, for Internet services, for telecommunications, or for wireless services. Completely rewritten the ISECOM way, Hacking Exposed Linux, Third Edition provides the most up-to-date coverage available from a large team of topic-focused experts. The book is based on the latest ISECOM security research and shows you, in full detail, how to lock out intruders and defend your Linux systems against catastrophic attacks....

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  • The ease or difficulty of packet snooping (also known as eavesdropping) on networks depends largely on the technology implemented. Shared media networks are particularly susceptible to eavesdropping because this type of network transmits packets everywhere along the network as they travel from the origin to the final destination. When concentrators or hubs are used in a shared media environment (such as FDDI, 10BASE-T, or 100-Mbps Ethernet), it can be fairly easy to insert a new node with packet-capturing capability and then snoop the traffic on the network.

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