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Topic: Denial of service

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	Denial-of-service attack - Wikipedia, the free encyclopedia
		A denial-of-service attack (also, DoS attack) is an attack on a computer system or network that causes a loss of service to users, typically the loss of network connectivity and services by consuming the bandwidth of the victim network or overloading the computational resources of the victim system.
		To combat Denial of Service attacks on the Internet, services like the Smurf Amplifier Registry have given network service providers the ability to identify misconfigured networks and to take appropriate action such as filtering.
		Denial of Service attacks can also lead to problems in the network 'branches' around the actual computer being attacked.
	en.wikipedia.org /wiki/Denial_of_service (1491 words)

	denial of service - a Whatis.com definition - see also: denial-of-service, denial of service attack, denial-of-service ...
		On the Internet, a denial of service (DoS) attack is an incident in which a user or organization is deprived of the services of a resource they would normally expect to have.
		A denial of service attack is a type of security breach to a computer system that does not usually result in the theft of information or other security loss.
		This type of denial of service attack exploits the way that the Internet Protocol (IP) requires a packet that is too large for the next router to handle be divided into fragments.
	searchsecurity.techtarget.com /sDefinition/0,,sid14_gci213591,00.html (824 words)

	What is a Denial of Service Attack? - - Online Features - Darwin Online for Informed Executives (Site not responding. Last check: 2007-11-07)
		Other kinds of denial of service attacks include using up all the victim’s bandwidth (instead of targeting a particular service—for more see bandwidth, left) or by using all of a system’s resources on a server like memory.
		A distributed denial of service (DDoS) attack is accomplished by using the Internet to break into computers and using them to attack a network.
		A distributed denial of service attack is when a number of compromised computer systems are used in the attack, while a denial of service attack does not use other compromised systems.
	www.darwinmag.com /learn/curve/column.html?ArticleID=115 (708 words)

	Internet Security Systems - Denial of Service FAQ (Site not responding. Last check: 2007-11-07)
		Denial of service attacks are designed to bring down an enterprise network or e-commerce site by flooding it with large amounts of traffic, similar to hundreds of people repeatedly dialing a telephone number to keep it busy and unavailable.
		A distributed Denial Of Service (DOS) attack uses the same methods as a regular DOS attack, but it is launched from multiple sources.
		When dealing with distributed denial of service attacks, there is no way for you to be able to stop them at your network.
	www.iss.net /news/denialfaq.php (2603 words)

	Open Directory - Computers: Internet: Abuse: Denial of Service (Site not responding. Last check: 2007-11-07)
		Denial of Service attacks and countermeasures - Presentation notes and illustrations on denial of service attacks and countermeasures given at the University of Rome "La Sapienza"
		Denial of Service Database - Details of many attacks: categorized by platform affected and using OSAT notation.
		GRC.com: Denial of Service Investigation and Exploration Pages - Analysis and investigation of the denial of service threat posed by Windows XP, and reports and logs from when GRC.com was the victim of a DDoS attack.
	dmoz.org /Computers/Internet/Abuse/Denial_of_Service (927 words)

	Denial of Service attacks - DoS, DDoS (SYN flood, email bombing, icmp attacks)
		Most acts to deny legitimate use of a service can be classed as a denial of service attack.
		In an office your printing ability can be denied by a malicious co worker or worse a network vulnerability which causes an attack by sending several large printing jobs or perhaps corrupted print jobs that can stall the printer.
		In this type of denial of service the attacker attempts to force the server not to communicate on the network and hence denies a service.
	www.surasoft.com /articles/ddosa.php (746 words)

	CERT/CC Denial of Service
		A "denial-of-service" attack is characterized by an explicit attempt by attackers to prevent legitimate users of a service from using that service.
		Other types of attack may include a denial of service as a component, but the denial of service may be part of a larger attack.
		There are other things that may be vulnerable to denial of service that you may wish to monitor.
	www.cert.org /tech_tips/denial_of_service.html (1891 words)

	Computer Associates Security Advisor Center Glossary
		One solution to this is the distributed denial of service approach, whereby a number of machines with 'attack services' installed on them are simultaneously commanded to attack a target system.
		These were mostly the agents (the part that implements the attack service), but a few examples of masters - the component that keeps track of the agents availability and sends the commands to begin and end an attack - were also captured.
		Although not commonly associated with viruses, denial of service components are included in some viral payload routines.
	www3.ca.com /virusinfo/glossary.aspx (15547 words)

	Denial of Service Attacks
		Denial of Service (or DoS for short) attacks are a kind of attacks against computers connected to the Internet.
		Here is a short report I wrote about Denial of Service attacks.
		Here is an FBI report on how the famous Melissa virus resulted in a denial of service on some networks.
	www.cs.utexas.edu /users/chuang/dos.html (1254 words)

	O'Reilly Network: Preventing Distributed Denial of Service Attacks
		A simple form of denial of service attack involves sending a stream of connection requests to a service in the hope of exhausting the server of memory or by reaching the server connection limit, if it has one.
		Distributed denial of service attacks are the most effective and insidious because they can generate more traffic from more sources.
		If you want to prevent distributed denial of service attacks on your hosts, the best hope you have is to prevent your own hosts and networks from being used to cause denial of service attacks on others and to encourage other network and system administrators to do the same.
	www.oreillynet.com /pub/a/108 (631 words)

	ONLamp.com: Preventing Denial of Service Attacks
		Denial of Service (DoS) attacks set out to remove a service from functional use by its clients.
		Protecting your services from attack is similar to tuning your services for maximum performance.
		Not all service-denying events constitute a Denial of Service attack and not all Denial of Service attacks constitute a service-denying event.
	www.onlamp.com /pub/a/bsd/2004/06/24/anti_dos.html (2537 words)

	Glossary of Network Security Terms \| WatchGuard Technologies, Inc.
		A portmapper is a service that runs on a specific port, redirecting clients that send a request to that port.
		The term "Denial of Service" is also used imprecisely to refer to any outwardly-induced condition that renders a computer unusable, thus "denying service" to its rightful user.
		The Domain Name Service act of matching a friendly, readable domain name (such as www.watchguard.com) to its associated IP address.
	www.watchguard.com /glossary/d.asp (1563 words)

	Cisco - Defining Strategies to Protect Against TCP SYN Denial of Service Attacks
		There is a potential denial of service attack at internet service providers (ISPs) that targets network devices.
		Since a primary mechanism of this denial of service attack is the generation of traffic sourced from random IP addresses, we recommend filtering traffic destined for the Internet.
		This does not prevent a denial of service attack on your network, but will help attacked parties rule out your location as the source of the attacker.
	www.cisco.com /warp/public/707/4.html (1158 words)

	IT Architect \| Distributed Denial of Service Attacks \| March 1, 2000 (Site not responding. Last check: 2007-11-07)
		Network-based denial of service attacks became popular after the SYN floods that took down Web servers in 1996.
		Winnuke, teardrop, Land, bonk, snork, and smurf are but a few of the denial of service attacks that crash systems or clog networks.
		In an ordinary network-based denial of service attack, an attacker uses a tool to send packets to the target system.
	www.itarchitect.com /article/NMG20000512S0041 (1511 words)

	distributed denial-of-service attack - a Whatis.com definition - see also: DDoS, DDoS attack, distributed DoS attack
		On the Internet, a distributed denial-of-service (DDoS) attack is one in which a multitude of compromised systems attack a single target, thereby causing denial of service for users of the targeted system.
		The inundation of packets to the target causes a denial of service.
		The SANS Institute paper, "Defenses against distributed denial of service attacks," suggests ways to guard against them.
	searchsecurity.techtarget.com /sDefinition/0,,sid14_gci557336,00.html (286 words)

	A9 Application Denial of Service
		Note that network denial of service attacks, such as SYN floods, are a separate problem that is outside the scope of this document.
		One of the hardest parts of denial of service attacks is determining whether you are vulnerable.
		Defending against denial of service attacks is difficult, as there is no way to protect against these attacks perfectly.
	www.owasp.org /documentation/topten/a9.html (878 words)

	TechWeb: TechEncyclopedia (Site not responding. Last check: 2007-11-07)
		Unlike a virus or worm, which can cause severe damage to databases, a denial of service attack interrupts network service for some period.
		A distributed denial of service (DDOS) attack uses multiple computers throughout the network that it has previously infected.
		Computers with high-speed connections to the Internet were hacked and planted with illicit programs that, when activated, sent out an unending number of requests and caused a denial of service at Yahoo!, eBay, Amazon.com and other Web sites during the second week of February 2000.
	www.techweb.com /encyclopedia/defineterm?term=denialofserviceattack (360 words)

	PestPatrol -
		A "Service" is any aspect of a computer system's functioning that provides benefit to a user.
		Any intervention which reduces or eliminates the availability of that service is called a "Denial of Service", often abbreviated DoS.
		Surfing the Tsunami: A large Southeastern university IS team fights off a massive distributed denial of-service attack and lives to tell about it.
	www.pestpatrol.com /whitepapers/dosandddos.asp (3248 words)

	Denial-of-service attack - Wikipedia, the free encyclopedia
		Distributed Denial of Service Attacks - general information of Distributed Denial of Service Attacks (DDoS)
		www.denialinfo.com - Denial of Service (DoS) Attack Resources
		www.newssocket.com - Distributed Denial of Service (dDoS) for hire
	en.wikipedia.org /wiki/Denial-of-service_attack (1491 words)

	PCWorld.com - Denial of Service Attacks Expected (Site not responding. Last check: 2007-11-07)
		There is a high probability that the U.S. critical computer infrastructure, such as the Web site of the U.S. Department of Defense, is being targeted for Distributed Denial of Service attacks by cyberprotestors, according to a warning issued Friday by the National Infrastructure Protection Center (NIPC).
		Denial of Service (DoS) attacks are those in which a target computer system is flooded with false requests for information to the point that it is unable to respond to legitimate requests, denying them service.
		Distributed Denial of Service (DDoS) attacks, the more damaging relative of DoS attacks, are those that use multiple computers worldwide to launch their attacks and are harder to combat.
	www.pcworld.com /news/article/0,aid,69704,00.asp (509 words)

	IT Architect \| Defying Denial of Service Attacks \| December 5, 2000 (Site not responding. Last check: 2007-11-07)
		In a Denial of Service (DoS) attack, the most affected service is a Web server.
		Basically, an attacker sends a stream of connection requests to a service in hopes of exhausting all memory or consuming all processor capacity in the server.
		Since the SYN ACK is destined for an incorrect or nonexistent host, the last part of the three-way handshake is never completed, and the entry remains in the connection queue until a timer expires, typically within about one minute.
	www.itarchitect.com /article/NMG20001130S0002 (1515 words)

	CNN - The denial-of-service aftermath - February 14, 2000
		Check here to see how a denial of service attack works.
		Denial of service hackers take on new targets
		Terms under which this service is provided to you.
	archives.cnn.com /2000/TECH/computing/02/14/dos.aftermath.idg (838 words)

	How a "denial of service" attack works \| CNET News.com
		One by one, leading sites on the Web have been brought to their knees by so-called denial of service attacks.
		In a denial of service attack, the user sends several authentication requests to the server, filling it up.
		One of the more common methods of blocking a "denial of service" attack is to set up a filter, or "sniffer," on a network before a stream of information reaches a site's Web servers.
	news.com.com /2100-1017-236728.html?legacy=cnet (641 words)

	Denial of Service or "Nuke" Attacks
		For example, Jeffrey Lee Parson, the 19 year old who wrote a variant of the Blaster worm and used it to attack 48,000 computers, was sentenced to 18 months in prison in January 2005, and may additionally have to pay a substantial fine.
		Denial of service should not be confused with other attacks like viruses, Trojan Horses, and cracking or "hacking".
		This can be effective against small attacks especially if you run a relay on a shell service account which tends to have more bandwidth than the attacker's connection.
	www.irchelp.org /irchelp/nuke (1185 words)

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