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Topic: Distributed 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. 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)

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. A distributed denial of service (DDoS) attack is accomplished by using the Internet to break into computers and using them to attack a network. www.darwinmag.com /learn/curve/column.html?ArticleID=115   (708 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. 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. 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. www.grc.com /dos/drdos.htm   (7862 words)

Internet Security Systems - Denial of Service FAQ 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. 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. 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)

Distributed denial of service 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. While the press tends to focus on the target of DDoS attacks as the victim, in reality there are many victims in a DDoS attack -- the final target and as well the systems controlled by the intruder. The flood of incoming messages to the target system essentially forces it to shut down, thereby denying service to the system to legitimate users. searchopensource.techtarget.com /tip/0,289483,sid7_gci557610,00.html   (322 words)

CERT Advisory CA-2000-01 Denial-of-Service Developments A variety of tools are available to detect, eliminate, and analyze distributed denial-of-service tools that may be installed on your network. Responding to a denial-of-service attack may require the cooperation of multiple parties. Similarly, machines that are not part of centralized computing facilities and that may be managed by novice or part-time system administrators or may be unmanaged, can be used by intruders to inflict harm on others, even if those systems have no strategic value to your organization. www.cert.org /advisories/CA-2000-01.html   (881 words)

The Attacks on GRC.COM Forging the IP address of an attacking machine (spoofing) is such a trivial thing to do under any of the various UNIX-like operating systems, and it is so effective in hiding the attacking machines, that no hacker would pass up the opportunity if it were available. During the seventeen hours of the first attack (we were subsequently subjected to several more attacks) we captured 16.1 gigabytes of packet log data. Thanks to the fact that the fleet of attacking machines were Windows PC's, they were unable to send TCP SYN packets to our port 80 (which would have crippled us completely), and were only able to flood us with UDP and ICMP packets (which we could temporarily ignore). grc.com /dos/grcdos.htm   (9537 words)

Distributed Denial of Service (DDoS) Attacks/tools Distributed Denial Of Service Attacks (DDOS), by David Anderson, MIT The Strange Tale of the Distributed Denial of Service Attacks Against GRC.COM, by Steve Gibson, June 2, 2001(My responses to Steve Gibson's initial claims and his later claims of discovering a "new" reflection attack. Surfing the Tsunami: A large Southeastern university IS team fights off a massive distributed denial of-service attack and lives to tell about it. staff.washington.edu /dittrich/misc/ddos   (4895 words)

Lessons from distributed denial-of-service As most readers know, the distributed denial-of-service attacks of recent weeks involve the unauthorized installation of special client software on hundreds, or perhaps thousands, of poorly secured computer systems linked to the Internet. Some reports have claimed that overall response time on the Internet worsened by as much as a quarter during the attacks (one news story quoted a figure of 27%, ridiculously precise for such an estimate). Finally, these attacks remind us that we are still not integrating cyberspace into our moral universe. www.networkworld.com /newsletters/sec/0221sec1.html   (905 words)

Technology News: Security : Denial of Service - Exposed This bombardment of data packets overwhelms the attacked computer, which innocently attempts to respond to each individual packet it receives -- much like an innocent home user attempting to pick up a telemarketer's call several times per second. A spoofed-source attack -- often called a SYN attack -- conceals the originating address or source. A DoS attack, at its simplest level, takes the form of one computer user swamping a target computer with an overabundance of connection attempts. www.technewsworld.com /perl/story/31467.html   (1242 words)

SCO Experiences Distributed Denial of Service Attack Mountain Time, it experienced a large scale distributed denial of service (DDoS) attack. This specific type of DDoS attack, called a "syn attack," took place when several thousand servers were compromised by an unknown person to overload SCO's Web site with illegitimate Web site requests. The attack caused the company's Web site (http://www.sco.com/) and corporate operational traffic to be unavailable during the morning hours including e-mail, the company intranet, and customer support operations. www.forrelease.com /D20031210/law081.P1.12102003151941.26085.html   (181 words)

Distributed Denial of Service Attack This is known as a Distributed Denial of Service (DDoS) attack. There were several high-profile DDoS attacks against popular web sites such as cnn.com, ebay.com, and amazon.com in 2000. These attacks will be the most likely threat to ivoting, since a highly coordinated, well executed is impossible to defend against. www.cs.virginia.edu /~pev5b/writing/academic/thesis/node32.html   (202 words)

stacheldraht.analysis The mass-instrusion phase is followed by the actual denial of service attack phase, in which these compromised systems which constitute the handlers and agents of the distributed attack network are used to wage massive denial of service attacks against one or more sites. One thing that may not have been clearly stated in the analyses done on trinoo and Tribe Flood Network is that distributed denial of service attacks are two phase attacks, with "victims" and "attackers" that are defined depending on your point of view. These are primary victims (of system compromise.) None of these distributed denial of service tools have any features that facilitate compromising systems, and these automated tools are held closely by those groups who wrote them. staff.washington.edu /dittrich/misc/stacheldraht.analysis   (3381 words)

Netcraft: MyDoom.F Deletes Files, Adds RIAA to DDoS Targets Like its predecessors, MyDoom.F has its own SMTP engine and spreads through e-mail attachments, and is programmed to launch denial of service attacks on web sites. MyDoom.F was discovered Feb. 20 and spread slowly at first, but is prompting increased warnings from security vendors as it begins to spread more widely. news.netcraft.com /archives/2004/02/24/mydoomf_deletes_files_adds_riaa_to_ddos_targets.html   (200 words)

Security Malicious Activities Denial of Service Closing the Floodgates: DDoS Mitigation Techniques (SecurityFocus Online) - To be on the receiving end of a distributed denial of service (DDoS) attack is a nightmare scenario for any network administrator, security specialist or access provider. Trends in Denial of Service Attack Technology (CERT) - The goal of this paper is to highlight recent trends in the deployment, use, and impact of DoS attack technology based on intruder activity and attack tools reported to and analyzed by the CERT/CC. A Denial of Service (DoS) attack is an attack in which a third party purposely floods a network or website with traffic in order to prevent legitimate access. security.ittoolbox.com /nav/t.asp?t=380&p=380&h1=380   (200 words)

What is a Denial of Service Attack? - - Online Features - Darwin Online for Informed Executives 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. A distributed denial of service (DDoS) attack is accomplished by using the Internet to break into computers and using them to attack a network. When a denial of service (DoS) attack occurs, a computer or a network user is unable to access resources like e-mail and the Internet. www.darwinmag.com /learn/curve/column.html?ArticleID=115   (200 words)

What is a Denial of Service (DoS) attack? A Distributed Denial of Service (DDoS) attack is a denial of service attack which is mounted from a large number of locations across the network. A Denial of Service (DoS) attack is an attack which attempts to prevent the victim from being able to use all or part of their network connection. Denial of service attacks are much easier to accomplish than remotely gaining administrative access to a target system. www.tech-faq.com /dos-denial-of-service-attack.shtml   (200 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. By making globbing requests to a web server it is sometimes possible to cause a Denial of Service attack as the the server is too busy to deal with legitimate requests. 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. www3.ca.com /virus/glossary.asp   (200 words)

TISC Insight, Volume 2, Issue 6 Distributed denial of service attacks are particularly disturbing for both law enforcement and security experts, as these devastating attacks can be very difficult to trace back to their sources. Distributed denial of service attacks can be considered to be cyber vandalism, as nothing is stolen except network bandwidth. The first well-known distributed denial of service occurred in August of 1999: The Trinoo attack tool was used to flood an Internet Relay Chat server at the University of Minnesota. www.tisc2001.com /newsletters/26.html   (200 words)

Symantec Security Response - Distributed Denial of Service (DDoS) attacks Distributed Denial of Service (DDoS) attacks are performed from multiple attack servers, which are remotely controllable by a hacker. The following picture shows an example of how Trojan-controlled "Zombies" are able to perform a DDoS attack on a victim located at the IP address 127.0.0.1: Before the attacker can launch a DDoS attack, he or she must gain full access to the computers that will be used as attack servers. securityresponse.symantec.com /avcenter/venc/data/ddos.attacks.html   (200 words)

Internet Security Systems - A Denial of Service attack is designed to bring a network down by flooding it with large amounts of traffic. ISS Security Alert December 7, 1999 Denial of Service Attack using the trin00 and Tribe Flood Network programs Synopsis: A new form of Denial of Service (DoS) attack has been developed that is more powerful than any previous DoS attack observed on the Internet. Technical Information: trin00: The trin00 distributed denial-of-service system consists of 3 parts: The Client: The client is not part of the trin00 package. xforce.iss.net /alerts/advise40.php3   (200 words)

Slashdot Distributed Denial of Service Attacks hetairoi was one of the many people who wrote to us about ZDNet's coverage of "distributed coordinated attacks", a new style of denial of service attack. As referenced in the original post, the slashdot effect was a distributed attack. Yes, the Slashdot Effect is, for all intents and purposes, a distributed DOS attack. slashdot.org /articles/99/10/20/1342208.shtml   (200 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. 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   (200 words)

Distributed Denial of Service (DDoS) Attacks/tools The Strange Tale of the Distributed Denial of Service Attacks Against GRC.COM, by Steve Gibson, June 2, 2001( My responses to Steve Gibson's initial claims and his later claims of discovering a "new" reflection attack. Surfing the Tsunami: A large Southeastern university IS team fights off a massive distributed denial of-service attack and lives to tell about it. The DoS Project's "trinoo" distributed denial of service attack tool, by David Dittrich staff.washington.edu /dittrich/misc/ddos   (200 words)

General Virus Information - Glossary of Virus Terms A program that was designed to consume resources in a denial of service attack is also tagged as destructive. Denial of service (DoS) is a malware routine that interrupts or inhibits the normal flow of data into and out of a system. A form of DoS attack is when a Web service (like a Web site or a download location) is accessed massively and repeatedly from different locations, preventing other systems from accessing the service and retrieving data from it. www.trendmicro.com /en/security/general/glossary/overview.htm   (200 words)

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