Denial-of-service attack

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Topic: Denial-of-service attack

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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.
		Denial of Service attacks can also lead to problems in the network 'branches' around the actual computer being attacked.
		In a distributed attack, the attacking computer hosts are often zombie computers with broadband connections to the Internet that have been compromised by viruses or Trojan horse programs that allow the perpetrator to remotely control the machine and direct the attack, often through a botnet/dosnet.
	en.wikipedia.org /wiki/Denial_of_service (2331 words)

	CERT/CC Denial of 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.
		A "denial-of-service" attack is characterized by an explicit attempt by attackers to prevent legitimate users of a service from using that service.
		In general, anything that allows data to be written to disk can be used to execute a denial-of-service attack if there are no bounds on the amount of data that can be written.
	www.cert.org /tech_tips/denial_of_service.html (1891 words)

	Define denial of service - a definition from Whatis.com - see also: denial-of-service, denial of service attack, denial-of-service attack
		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.
		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.
	whatis.techtarget.com /definition/0,289893,sid9_gci213591,00.html (837 words)

	Denial of Service attack
		Denial of Service (DOS) Attacks are attacks on computer systems that aim to disrupt or terminate services provided by the systems.
		The only way to completely eliminate this kind of attacks is to decrease the number of systems that can be compromised to a level that is too low for attackers to set up large distributed DOS networks.
		These attacks use a network of computers to distribute the attack sources over several network locations.
	www.thocp.net /reference/hacking/dos_attack.htm (825 words)

	Internet Security Systems - Denial of Service FAQ
		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.
		When dealing with distributed denial of service attacks, there is no way for you to be able to stop them at your network.
		A distributed Denial Of Service (DOS) attack uses the same methods as a regular DOS attack, but it is launched from multiple sources.
	www.iss.net /news/denialfaq.php (2603 words)

	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.
		Due to this and the many vectors of attack, there are not comprehensive rules that can be implemented on network hosts in order to protect against denial-of-service attacks, and it is a difficult feat to determine the source of the attack and the identity of the attacker.
		Denial of Service attacks can also lead to problems in the network 'branches' around the actual computer being attacked.
	en.wikipedia.org /wiki/DDoS (1652 words)

	How a 'denial of service' attack works CNET News.com
		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.
		In a denial of service attack, the user sends several authentication requests to the server, filling it up.
		One by one, leading sites on the Web have been brought to their knees by so-called denial of service attacks.
	news.com.com /2100-1017-236728.html (646 words)

	The Distributed Reflection DoS Attack
		As I discovered and documented in May of 2001, powerful, remote Internet attack tools are now in the hands of children who wield their disruptive power with little thought for, or remorse over, the consequences.
		As was true for this January 11th attack, any sort of "distributed" attack is most often a "bandwidth consumption" attack where the combined Internet connection bandwidth of many machines is "focused", or directed, upon one or a few machines.
		Unlike traditional spoofed source IP attacks, which typically generate source IPs at random, every IP occurring during the different aspects of a reflection attack refers to a valid machine — either a reflection server or the attack target.
	grc.com /dos/drdos.htm (7862 words)

	US-CERT Cyber Security Tip ST04-015 -- Understanding Denial-of-Service Attacks
		Denial-of-service attacks can be difficult to distinguish from common network activity, but there are some indications that an attack is in progress.
		The attack is "distributed" because the attacker is using multiple computers, including yours, to launch the denial-of-service attack.
		Not all disruptions to service are the result of a denial-of-service attack.
	www.us-cert.gov /cas/tips/ST04-015.html (624 words)

	Denial-of-Service Attack-Detection Techniques
		Attack models with sharp volume increases or uniform address distributions reflect a small, aging subset of the attack problem space.
		For this reason, flooding attacks are especially difficult because even the best-maintained system can become congested, thus denying service to legitimate users.
		The malformed attack packets interact with installed software, causing excessive memory consumption, extra CPU processing, system reboot, or general system slowing.
	www.computer.org /portal/site/dsonline/menuitem.9ed3d9924aeb0dcd82ccc6716bbe36ec/index.jsp?&pName=dso_level1&path=dsonline/2006/01&file=w1spot.xml&xsl=article.xsl& (4228 words)

	Cisco - Defining Strategies to Protect Against TCP SYN Denial of Service Attacks
		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.
		Note: Cisco IOS 11.3 software has a feature to actively prevent TCP denial of service attacks.
	www.cisco.com /warp/public/707/4.html (1162 words)

	Denial of Service or "Nuke" Attacks
		Denial of service should not be confused with other attacks like viruses, Trojan Horses, and cracking or "hacking".
		In most cases, however, the attacks come from tens or hundreds of computers which have been hijacked through viruses, so the best you can do is share those logs with your ISP and hope they can block the attacks for you.
		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)

	What is a Denial of Service Attack? - - Online Features - Darwin Online for Informed Executives
		Attacks can happen any number of ways, but a general example of a distributed denial of service attack looks something like this: the perpetrator breaks into a computer system and loads it with a number of tools, including denial of service or distributed denial of service programs.
		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.
		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.
	www.darwinmag.com /learn/curve/column.html?ArticleID=115 (708 words)

	Denial of service
		These hostile applets are exercising what is known as a denial of service attack.
		For example, one attack displayed from Ladue's Georgia Tech site is an applet that paints huge black windows on your screen, in such a way that you can't access other parts of the screen.
		These are collections of Java applets that consume resources in rude or malicious ways, so that either all the CPU or memory resources of your computer are consumed, or, you are tricked into thinking a dangerous attack has been launched on your computer.
	java.sun.com /sfaq/denialOfService.html (483 words)

	dos3.html
		A Denial of Service attack is designed to bring a network down by flooding it with large amounts of traffic.
		All that is then needed is the ability to establish a TCP connection to the master hosts using "telnet" and the password to the master server to be able to wage massive, coordinated, denial of service attacks.
		TFN is made up of client and daemon programs, which implement a distributed network denial of service tool capable of waging ICMP flood, SYN flood, UDP flood, and Smurf style attacks, as well as providing an "on demand" root shell bound to a TCP port.
	pulhas.org /xploitsdb/mUNIXes/dos3.html (7154 words)

	Skype Journal: Using Skype for a POTS Denial of Service Attack
		Using Skype for a POTS Denial of Service Attack
		Wartex on Using Skype for a POTS Denial of Service Attack
		This will be a new phenomenon in the VoIP world: phone denial-of-service attacks.
	www.skypejournal.com /blog/archives/2005/04/using_skype_for_1.php (982 words)

	What is DoS attack? - A Word Definition From the Webopedia Computer Dictionary
		Short for denial-of-service attack, a type of attack on a network that is designed to bring the network to its knees by flooding it with useless traffic.
		For all known DoS attacks, there are software fixes that system administrators can install to limit the damage caused by the attacks.
		The recent spate of DDoS attacks made victims not only of their Web site targets but also of the computers that hackers mind-controlled into making the attacks.
	www.webopedia.com /TERM/D/DoS_attack.html (291 words)

	Microsoft aims to outsmart denial-of-service attack
		Microsoft on Friday took steps to defend its patch download site from a denial-of-service attack expected to be launched this weekend by machines infected by the now notorious Blaster worm.
		Also, Microsoft and its provider of DNS services, Akamai, have been adjusting DNS routing variables associated with the disabled URL in a move that is thought to be an additional defense against the attack, which is expected to come in waves, when the URL is again live.
		It is unknown if the author or authors of the Blaster worm intended to attack the windowsupdate.com URL or if they made an error.
	www.networkworld.com /news/2003/0815mssmart.html (964 words)

	Internet slowed by suspected denial-of-service attack
		A LARGE-SCALE DENIAL-OF-SERVICE attack hit the Internet Saturday, causing varying degrees of trouble to computer users and server operators around the world, according to security experts.
		The server resolution service provides a way for clients to query for the appropriate network endpoints to use for a particular SQL Server instance, according to Microsoft.
		Antivirus software vendor Symantec Corp. said it noticed a significant increase in scans related to the server resolution service at the same time as problems began hitting the Internet in South Korea.
	www.infoworld.com /articles/hn/xml/03/01/25/030125hnsqlnet.html?s=IDGNS (975 words)

	Winds of Change.NET: Special Report: Cyber-Attack on Warbloggers
		Excerpt: DDOS is a "Distributed Denial of Service" attack.
		As DuHarb says, the DoS attacks (today's is the third since Friday) have all been targetted at one site (according to the good folks at Hostingmatters); the initial attempt to isolate the IP failed, for reasons I don't quite understand, but HM has since isolated a block of IPs and is assigning new addresses.
		Malaysia may not be the real source of the attacks; it could just be that due to its immature but very fast infrastructure it is a convenient location to compromise machines to do the dirty work of a DoS attack.
	www.windsofchange.net /archives/004183.php (4905 words)

	New Scientist Breaking News - Internet's foundations shaken by attack
		This technique is known as a distributed denial of service attack (DDoS) and crashes or severely slows targeted machines.
		A spokesman for the FBI's National Infrastructure Protection Centre said officials were "aware of the denial of service attack and addressing this matter".
		Numerous free software packages can be used to compromise computers for a DDoS attack.
	www.newscientist.com /article.ns?id=dn2963 (571 words)

	Distributed Denial of Service Attacks
		Distributed Denial of Service (DDoS) attacks are a relatively new development; they first appeared in the summer last year, and were first widely discussed a couple of months ago.
		The SANS Institute has published articles on the Distributed Denial of Service (DDoS attack) and on the ingress filtering that should be deployed to help make it harder to implement and easier to track down and stop.
		So as long as the attacker turns their attack off after at most a few hours, you are unlikely to find more than a few of the thousands of machines used to launch the attack; the remainder will remain available for further attacks.
	www.linuxsecurity.com /resource_files/intrusion_detection/ddos-faq.html (4117 words)

	Distributed Denial of Service Attack: January-April 2004
		I also came across this in-depth analysis of a distributed denial of service which provides both technical details of how the attack zombie hosts are remote-controlled and offers an insight into the motivation and psychology of those behind these attacks.
		Discoveries made as the attack progressed and forensic analyses of the attack in progress and its history as recorded in the logs are chronicled in the daily updates appended to the original incident report.
		The attack, which started winding down on the 13th of February and rapidly reached negligible levels, came back on the 17th, ramping up as quickly as the initial onset and peaking (at this writing) at half the maximum rate of the first go-round.
	www.fourmilab.ch /documents/security/incidents/ddos_2004-01 (10031 words)

	CERT/CC Denial of 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.
		A "denial-of-service" attack is characterized by an explicit attempt by attackers to prevent legitimate users of a service from using that service.
		In general, anything that allows data to be written to disk can be used to execute a denial-of-service attack if there are no bounds on the amount of data that can be written.
	www.cert.org /tech_tips/denial_of_service.html (1891 words)

	The Distributed Reflection DoS Attack
		As was true for this January 11th attack, any sort of "distributed" attack is most often a "bandwidth consumption" attack where the combined Internet connection bandwidth of many machines is "focused", or directed, upon one or a few machines.
		As I discovered and documented in May of 2001, powerful, remote Internet attack tools are now in the hands of children who wield their disruptive power with little thought for, or remorse over, the consequences.
		This is the organization used by the many popular distributed attack tools, including the Windows-hosted Evilbots driven by the 13-year-old "Wicked" that originally attacked grc.com during May of 2001.
	www.grc.com /dos/drdos.htm (7862 words)

	Internet Security Systems - Denial of Service FAQ
		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)

	New denial-of-service attack tool uses relay chat
		The chat feature in the new Trinity distributed denial-of-service attack tool makes it easier for the hacker to launch an attack and helps the hacker prevent his real identity from being uncovered, since hackers typically change their IP address for use in a chat channel.
		ISS first learned of the Trinity distributed denial-of-service attack tool when it was recently brought to the attention of the Forum of Incident Response Teams - an umbrella organization for security notification groups such as CERT - by an educational institution which found some campus computers infected by it.
		Trinity is a Linux-based distributed denial-of-service attack tool that a hacker can use to launch a massive IP flood against a victim's targeted computer, much the way its predecessors TFN and Trin00 do.
	www.networkworld.com /news/2000/0906ddos.html (777 words)

	SCO Denial-of-Service Attack, Take Two
		Days after a denial-of-service attack laid its Web site low, controversial Unix contender The SCO Group Inc. on Saturday was apparently hit by a second DoS attack.
		IDC also explains how Symantec's unique multilevel approach to threat management, which includes appliances, software and web-based services, proactively shields organizations against threats while ensuring information accessibility.
		After the first attack, some securtiy experts on Groklaw claimed that SCO should have been able to easily stop the SYN DoS attack.
	www.eweek.com /article2/0,4149,1413019,00.asp (1017 words)

	Denial of Service Database
		For more information on Denial of Service, visit the DoS Help Desk.
		If this is your first time visiting the DoS DB, please take a minute to read the following ABOUT the database.
	attrition.org /security/denial (58 words)

	Denial of Service Attack (Linktionary term)
		See "Security" and RFC 2827 (Network Ingress Filtering: Defeating Denial of Service Attacks Which Employ IP Source Address Spoofing, May 2000).
		Note: Many topics at this site are reduced versions of the text in "The Encyclopedia of Networking and Telecommunications." Search results will not be as extensive as a search of the book's CD-ROM.
	www.linktionary.com /d/dos_attack.html (97 words)

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