What Is DOS Attack & How its Work?
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What-Is-DOS-Attack-&-How-its-Work |
DoS attack is used to
tie up a website’s resources so that users who need to access the site cannot
do so. Many major companies have been the focus of DoS attacks. Because of a DoS
the attack can be easily engineered from nearly any location, finding those responsible
can be extremely difficult.
While an attack that
crashes a server can often be dealt with successfully by simply rebooting the
system, flooding attacks can be more difficult to recover. (DDoS)the attack, in which attack traffic comes from a large number of sources, can be
even more difficult.
If You Read About Diff. Types Of Attacks In Network Security? Just Click On Link & Read Out....
How Does the DoS attack works?
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How a dos attack work |
In a DoS attack, a computer is rigged to
send not just one “introduction” to a server, but hundreds or thousands. The
server — which cannot tell that the introductions are fake — sends back its
usual response, waiting up to a minute in each case to hear a reply. When it
gets no reply, the server shuts down the connection, and the computer executing
the attack repeats, sending a new batch of fake requests.
DoS attacks mostly affect organizations
and how they run in a connected world. For consumers, the attacks hinder their
ability to access services and information.
There
are two general methods of DoS attacks: flooding services or crashing
services.
Flooding attacks
Flooding is the more common form of DoS
attacks. It occurs when the attacked system is overwhelmed by large amounts of
traffic that the server is unable to handle. The system eventually stops.
Buffer
overflow attacks –
the most common DoS attack. The concept is to send more traffic to a network
address than the programmers have built the system to handle.
ICMP
flood –
leverages misconfigured network devices by sending spoofed packets that ping
every computer on the targeted network, instead of just one specific
machine. This attack is also known as the smurf attack or ping of death.
SYN Flood - An SYN flood is a
variation that exploits a vulnerability in the TCP connection sequence.
Crash attacks
when cybercriminals
transmit bugs that exploit flaws in the targeted system.
Signs of a DoS Attack
- An inability to reach a particular website;
- A higher than usual volume of spam email.
- Difficulty accessing a website.
- Interruption of network traffic.
If You Don't Know About What Is Threats & Its Types? Just Click On That Link & Read Out..
Preventing a DoS attack
- Easy installation on Apache and IIS servers.
- Strong security against known and emerging hacking attacks.
- Best-of-breed predefined security rules for instant protection.
- Interface and API for managing multiple servers with ease.
- Requires no additional hardware, and easily scales with your business.
DOS Attack Types
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Types of DOS Attacks |
Teardrop Attack
In a teardrop DoS attack, the attacker
sends IP data packets in the form of fragments to the victim system.
User Datagram Protocol flooding
User Datagram Protocol (UDP)
is an unreliable packet. This means the sender of the data does not care if the
receiver has received it. In UDP flooding, many UDP packets are sent to the
victim at random ports.
Ping of Death
Ping of Death manipulates IP protocols
by sending malicious pings to a system.
Exploits
Exploits for servers can
also cause DDoS vulnerability. A lot of web applications are hosted on web
servers, such as Apache and Tomcat. If there is a vulnerability in these web
servers, the attacker can launch an exploit against the vulnerability.
SYN flood
The attacker
sends a lot of SYN packets and the server waits for the final ACK until
timeout. Hence, the server exhausts its resources waiting for ACK.
This kind of attack is called SYN flooding.
If You Read About What Is Intrusion Detection System (IDS)? Just Click On Link & Read Out.
DOS Attacks Tools
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Types of DOS Attacks Tools |
- LOIC (Low Orbit Ion Cannon)
- XOIC
- HULK (HTTP Unbearable Load King)
- R-U-Dead-Yet
- Tor’s Hammer
- OWASP DOS HTTP POST
- DAVOS
- PyLoris
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