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网络入侵与攻击技术


Invasion and attack
? intrusion : refers to any threat and damage behavior of the

system resources (such as non-authorized or unauthorized access to system resources, wiretap

ping information), the implementation of intrusion "person" referred to as an intruder.
? Attack: attack the intruder invasion techniques and

methods. The invasion of the whole process (including the invasion preparation, attack, invade) are accompanied by an attacker, it is sometimes also known as the intruder attacker.

The general means of hacking

http ftp telnet smtp
Port scanning

The general means of hacking

Name:john
PassWord:john1234

Password violent attacks

The general means of hacking

Get exploited Superuser privileges
Leave the back door

Changing the Home Information

Hide user

Login with john Server

DoS Attack
A through run out of system resources such as CPU, memory, bandwidth and disk space, to block or weaken the behavior of network, system or application's authorization.
The attack principle is: the target host has been in a busy payable or has been in a state of waiting for a response to provide services for other hosts using a variety of means constantly sent to the target host false request or junk information.

SYN FLOOD

Land Attacks
Land attack is an attack technique often used in DoS attacks, the principle is: SYN packet with a specially built, and its source and destination addresses are set as a server address.

Assailant
172.18.1.1

LAND Attack: program sends a TCP SYN packet, the same source address and destination address, source and destination ports are the same, resulting in a DoS attack 。
Target 204.241.161.12

Code

Internet
Spoofed IP packet
Source address: 204.241.161.12 Port 139 Destination address: 204.241.161.12 Port 139 TCP Open

9
G. Mark Hardy

"Denial of service" example: LAND attack

Assailant
172.18.1.1

Code

Target 204.241.161.12

Internet
崩溃

Spoofed IP packet Source address: 204.241.161.12 Port 139 Destination address: 204.241.161.12 Port 139 Package was sent back to its own
10
G. Mark Hardy


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