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Mr Bomb

TCP/IP Hijacking

2 posts in this topic

TCP/IP Hijacking is when an authorized user gains access to a genuine network connection of another user. It is done in order to bypass the password authentication which is normally the start of a session.

In theory, a TCP/IP connection is established as shown below ***8722;

tcp_ip.jpg To hijack this connection, there are two possibilities ***8722;


  • Find the seq which is a number that increases by 1, but there is no chance to predict it.
  • The second possibility is to use the Man-in-the-Middle attack which, in simple words, is a type of network sniffing. For sniffing, we use tools like Wireshark or Ethercap.



An attacker monitors the data transmission over a network and discovers the IP’s of two devices that participate in a connection.

When the hacker discovers the IP of one of the users, he can put down the connection of the other user by DoS attack and then resume communication by spoofing the IP of the disconnected user.



In practice, one of the best TCP/IP hijack tools is Shijack. It is developed using Python language and you can download it from the following link ***8722; https://packetstormsecurity.com/sniffers/shijack.tgz

Here is an example of a Shijack command ***8722;

root:/home/root/hijack# ./shijack eth0 53517 23 shijack.jpg Here, we are trying to hijack a Telnet connection between the two hosts.



Hunt is another popular tool that you can use to hijack a TCP/IP connection. It can be downloaded from ***8722; https://packetstormsecurity.com/sniffers/hunt/


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a thousand thanks for the explanation

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