Dos Attack Basic Tutorial for Beginners
Created by-Amin Nagpure.(sukhoi) / 4/8/99.
----Disclaimer---
Writer don’t intend to get
information by his writing to be used in an illegal way ,don’t do it, if you
get caught then you have yourself to blame.
My information is just for educational purpose only.
This tutorial is written for absolute newbies who don’t know
whats dos attack , technical details is reduced so that basic concept about
what it is get cleared.ok
So don’t email me and say you lack technical knowledge or
your tutorial is less in it.
There are so many available on the net. This one is for
absolute newbie okay.
Dos attacks-“Denial of Service” Attack
It’s the attack to deny the service to the legitmate user
,so that he suffers there are several reasons to do that.
Mostly likely reason is ‘NAST-YINESS’
Okay there are two ways for dos attacks one is the lame way
and the other is the elite way
Lame way
Email Bombs – it s the technique in which a person email Alc
is flooded with emails, it’s the lamest
form of DOS attack. All a person has to do is go on the net get some
email bomber like UNA or KABOOM put the victims address and there ya go , his
email address will be flooded with the unwanted emails, there is also another
way put his email address into some porn subscription he will get bombed
without you doing anything ,LOL
When the victims email alc gets flooded he has a pain in
differentiating and deleting the unwanted emails and it’s the huugee task.
And if the victim is the admin of the server and his email alc
there is flooded it also looses his disk space.
Continous login – suppose a server is configured to allow
only specified amount login attempts then ,and you know his username you can
lock his account, by attempting to connect by his name to the server which will
lock his account and there ya go , the legitmate user wont be able to log in
,the reason, you locked his Alc.
Okay now the neophyte way, its not that elite way but some
what better than the lame way, atleast you are doing something technical.
Syn Flooding
This is a exploit in tcp/ip method of handshake .
Read some basics on tcp/ip okay lets start.
Normal way :-
Syn-packet is sent to the host by the client who intends
to establish a connection
SYN
Client --------------à Host
Then in the second step host replies with syn/ack packet to
the client
SYN/ACK
Client ß--------------Host
Then in the third and the last step
Client replies with ack packet to the host and then the
threeway handshake is complete
Okay got it now ..?
Now in attack
Several syn packet is
sent to host via spoofed ip address(bad
or dead ip addresses) now then what happens the host replies with syn/ack
packet and host waits for the ack
packet.
But however the ip address don’t exist it keeps waiting ,thus it queues up and eats
the system resources and thus causes the server to crash or reboot.
Land attack
A land attack is
similar to syn attack but instead of bad ip address the ip address of the
target system itself is used. This creates an infinite loop , and the target
system crashes.
But however almost all systems are configured against this
type of attacks.
Smurf Attack
A smurf attack is a
sort of brute force dos attack , in which a huge number normally the router
using the spoofed ip address from within the target network , so when it gets
the ping it echos it back causing the network to flood. Thus jamming the
traffic
Udp flooding
This kind of flooding is done against two target systems and
can be used to stop the services offered by any of the two systems. Both of the
target systems are connected to each other, one generating a series of
characters for each packet received or in other words, requesting UDP character
generating service while the other system, echoes all characters it receives.
This creates an infinite non-stopping loop between the two systems, making them
useless for any data exchange or service provision.
This Attack don’t work now as all the servers are patched
against this type of attack
In this attack a target system is pinged with data packet
exceed the normal size allowed by the tcp/ip i.e 65536. this will cause the
system to reboot or hangup.
Tear Drop
When the data is passed from one system into another it is
broken down into smaller fragments, and then in the reciving host they are again reassembled .
These packets have an offset field in there TCP header part
which specifies from which part to which part that data carries or the range of
data that it is carrying. This along with the sequence numbers, this helps the
receiving host to reassemble the data.
In tear drop the packets are sent with the overlapping
offset field values thus the reciveing host is unable to reassemble them and
crashes.
to get all latest hacking tips n tricks directly to ur inbox
Do you know any open/free software/tool to simulate ping-of-death attack, tear drop attack, ip-fragment attack and tracert attack?
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