Danial-Of-Service(DOS) attack
DOS is an attack to shut down a machine and making it inaccessible to its intended users. Danial-Of-Services attach accomplish this by flooding the target with traffic, or sending information that a crash.
Victims of DOS attacks will target web server of high profile such as banking, commerce and media companies. There are two methods of DOS attacks by flood services or crashing services. Flood attacks when system receive too much traffic for server to buffer.
Popular flood attacks include:
Buffer overflow attacks
This is common attacks by send more traffic to network address then programmers. It includes attacks listed below that designed to exploit specific to certain application or network. Buffers are memory regions that are set aside to keep information, often moving it from one program portion to another, or between programs.
ICMP flood
Misconfigured network devices by spending spoofed packets that ping every computer on targeted network, instead of just specific machine. This attack known as a smurf attack or ping of deadth. Ping flood, also known as ICMP flood, is a common Denial of Service (DoS) attack in which an attacker takes down a victim’s computer by overwhelming it with ICMP echo requests, also known as pings. The attack involves flooding the victim’s network with request packets, knowing that the network will respond with an equal number of reply packets. Additional methods for bringing down a target with ICMP requests include the use of custom tools.
SYN flood
It sends a request to connect a server but never completes. Continues until all open ports are saturated with requests and none are available for legitimate users.
DOS attacks simply exploit vulnerabilities that cause target system or crash. Input is sent that takes advantages of bugs in the target that subsequently or severely destabilize the system, so it cant be accessed or used.