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Denial of Service Rule-based DoS attacks prevention shell script In this article, I describe a simple rule-based DoS attack-prevention shell script. However, the proposed shell script is not a perfect tool for preventing DoS attacks, but a powerful tool for alleviating DoS attacks overheads of the Linux servers significantly. Read the Article Withstanding Denial of Service Attacks There are three basic ways in which a server can be attacked. It can be vandalized, robbed, or denied service. This article will be covering denial of service (DoS) and what can be done to make an IIS server more resistant to DoS attacks. This article will deal specifically with IIS and not cover other areas such as router configuration or DNS hijacking. Read the Article Spoofed IP Address Distributed Denial of Service Attacks: Defense-in-Depth One challenge to businesses worldwide is to permit and even encourage desirable Internet traffic while excluding unwanted or even detrimental traffic. Over the past 18 months, there have been numerous articles, practicals, publications, and white papers written on one particular type of unwanted and detrimental Internet traffic - Distributed Denial of Service (DDoS) attacks. For the Internet community, the key to reducing and/or stopping DDoS attacks is to utilize a defense-in-depth approach without creating limitations in performance or scalability. The purpose of this paper is to look at a defense-in-depth approach to spoofed IP address DDoS attacks, including known defenses, new techniques, and recent developments. Read the Article Denial of Service via Algorithmic Complexity Attacks We present a new class of low-bandwidth denial of service attacks that exploit algorithmic deficiencies in many common applications data structures. Frequently used data structures have "average-case" expected running time that's far more efficient than the worst case. We show how an attacker can effectively compute such input, and we demonstrate attacks against the hash table implementations in two versions of Perl, the Squid web proxy, and the Bro intrusion detection system. Read the Article Bots & Botnet: An Overview Using thousands of zombie machines to launch distributed denial of service attack against enterprise and government internet resources by attackers is becoming dangerously common trend. Read the Article The Unintentional Criminal: DDoS from the inside! This paper will highlight the IT Security problems resulting from the economic constraints on an ISP in a developing country and of their impact everywhere. I will use the example of a Distributed Denial of Service (thereafter DDoS) attack tovdemonstrate the process of its detection, analysis and protection. I will also discuss ways of raising the level of IT Security with minimum investment that could be attractive for low-budget companies. At the end it will be concluded that the lack of budget is not a good reason to reduce the security level, thus jeopardizing the security and continuity of operation of everyone else, because there is always a way to enhance the security level using free or low-cost solutions. It will also be clear the need to have IT staff with a sound understanding of the security process, even in small companies. Read the Article Internet Denial of Service Attacks and the Federal Response Distributed systems based on the client/server model have become increasingly common. In recent months, there has been an increase in the development and use of distributed network sniffers, scanners, and denial-of-service tools. Attacks using these tools can involve a large number of sites simultaneously and be focused to attack one or more victim hosts or networks. Damaged systems include those used in the attack as well as the targeted victim. For the victim, the impact can be extensive. For example, in a denial-of-service attack using distributed technology, the attacked system observes simultaneous attacks from all the nodes at once, flooding the network normally used to communicate and trace the attacks and preventing any legitimate traffic from traversing the network. Read the Article Managing the Threat of Denial-of-Service Attacks Denial-of-service (DoS) attacks have been launched against Internet sites for years. They are a significant problem because they can shut an organization off from the Internet and because there is no comprehensive solution "no silver bullet" for protecting your site or recovering from a denial of service. In this paper, we will describe the current situation with denial-of-service attacks and explore ways of addressing the problem. Read the Article An introduction to the Fake players bug and DoS 0.1.1 An attacker can fill a game server with a custom number of inexistent players (1 player is 'emulated' by no more than one or two packets of data) and the server after having reached the maximum number of players will not accept others. The effect is a Denial of Service where the real players cannot use the service offered by the server because it is already full. Read the Article Barbarians at the Gate: An Introduction to Distributed Denial of Service Attacks Recently, major news outlets reported that a coordinated attack designed to disable several of the Internet's root name servers had taken place. The attack, described as sophisticated and complex, is known as a distributed denial of service (DDoS). Although no serious outages occurred, it was a hot topic in the security world - again. Again? Similar attacks first made headlines in February 2000. Although discussed in security circles for some time before that, this was the first prolonged example of a DDoS, and prevented legitimate traffic from reaching major sites for several hours. Yahoo, eBay, Buy.com, and CNN were but a few mjor sites who were inaccessible to their customers for extended periods of time. Now, almost three years later, can it be that we're still vulnerable? Unfortunately the answer is yes. This article will explain the concept of DDoS attacks, how they work, how to react if you become a target, and how the security community can work together to prevent them. Read the Article Page: 1 2 3 Members currently browsing this category:

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