Denial Of Service Attack

Denial Of Service Attack

Submitted by Srikanth on Friday, 7 November 200812 Comments

Is your Spouse Cheating? Catch a Cheating Spouse Red-Handed!
Access Any PC from Anywhere. Spy on Any Email to Find Out the Truth! Award Winning Remote PC Surveillance Software.
Want to Learn Hacking? ...But Don't Know Where to Start?
Learn Underground Hacker Techniques from the Basics. Become One with the Hackers. Start Your Journey Today!

Its Real,On February 6th, 2000, Yahoo portal was shut down for 3 hours. Then retailer Buy.com Inc. (BUYX) was hit the next day, hours after going public. By that evening, eBay (EBAY), Amazon.com (AMZN), and CNN (TWX) had gone dark. And in the morning, the mayhem continued with online broker E*Trade (EGRP) and others having traffic to their sites virtually choked off.

What is a Denial Of Service Attack?

A denial of service attack (DOS) is an attack through which a person can render a system unusable or significantly slow down the system for legitimate users by overloading the resources, so that no one can access it.
If an attacker is unable to gain access to a machine, the attacker most probably will just crash the machine to accomplish a denial of service attack.

Types of denial of service attacks

There are several general categories of DoS attacks.Popularly, the attacks are divided into three classes:

bandwidth attacks,
protocol attacks, and
logic attacks

What is Distributed Denial of Service Attack?

An attacker launches the attack using several machines. In this case, an attacker breaks into several machines, or coordinates with several zombies to launch an attack against a target or network at the same time.
This makes it difficult to detect because attacks originate from several IP addresses.
If a single IP address is attacking a company, it can block that address at its firewall. If it is 30000 this is extremely difficult.

Popularity: 32% [?]

Visitors who read this post, also read:

Trojans and Backdoors

Enjoyed this article?
Subscribe to GO HACKING and get daily updates in your email for free

12 Comments »

Blaster(Ash) said:

Yeah, recently DDOS attack is getting too famous. And they are using a technique called REFLECTIVE AMPLIFICATION. Do you know anything bout this technique?

- 12 November 2008 at 8:16 pm

Srikanth (author) said:

@ blaster

Recursive amplification

This type of attack uses IP address spoofing, a type of impersonation technique, where
the attacker transmits packets with a forged source IP address rather than its own. The attack also exploits DNS servers that allow open recursion. Recursion is a method of processing a DNS query in which a name server pursues the query for a client at (typically) the authoritative name server for the name. When recursion is performed for any client as opposed to a trusted set of clients, a name server is said to be an open recursive server. Finally, the attack uses amplification, where the attacker sends a small request with the expectation of invoking a much larger response.

- 13 November 2008 at 6:59 am

Slim0123 said: