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TCP sequence prediction attack What is it, how does it work and what are the measures to protect ourselves?

Computer security is one of the most important factors today both for big companies as small. And is that most people handle a large amount of important data via your networked computers, so that the protection of all this data is essential at all times.

Today you can witness a great variety of computer attacks what affect computers at all times. This is how it exists TCP sequence prediction, an attack that takes care of guess the sequence number and then use it to spoof packages.

Considering that this is one of the most common and most used attacks in computing, here we are going to explain a little more on what it’s all about and how you can start avoiding them. For this, it will be necessary that you follow in detail everything that we will teach you next in the post.

What is a TCP Sequence Attack and what is its goal in computing?

TCP sequence attacks are nothing more than an attempt to predict the sequence number that is used to identify the packets in a TCP connection. To be able to guess bliss sequence the attackers have the possibility to use them to counterfeit packages and thus be able to enter the victim systems. Therefore, the purpose of the attacker is to manage to correctly guess the sequential number and then use it in the shipment.

If this is done correctly then cybercriminal will have the opportunity to send all counterfeit packages that are necessary, in fact, they may have a third host to be controlled by the attacker. This normally occurs by the attacker listens to the conversation through the trusted hosts, to later achieve broadcasting the packets using the same source IP address.

When monitors traffic before mounting an attack, the malicious host is able to figure out the correct sequence, which will guarantee the success of the mission. After this you can know what it is the source IP address and sequence number, so all this is defined as a race between the trusted host and attacker in order to get the packet sent successfully.

As usual, the attacker usually sends an attack to the trusted host, as it is denial of service attack, this will allow you to keep connection control, so you can start send the counterfeit packages. When the assailant managed to provoke all this and deliver counterfeit packages, he himself is capable of cause significant damage, including what is known as an injection into a existing TCP connection of the attacker’s choice data.

All of this causes a shutdown the existing TCP connection by injecting spoofed packets with the RST bit set. Therefore, this attack consists mainly of being able to guess the sequence number and enter the offender’s TCP connection via fake packets that will be in charge of collecting all the necessary data and in turn cause damage that can be very severe. Accordingly, it is very important that these types of attacks can be countered in time.

Learn how to prevent TCP sequence prediction attacks to keep your network protected

Learn how to prevent TCP sequence prediction attacks to keep your network protected

As mentioned above, it is essential be able to protect yourself from this type of attack, the same can solve in different ways, This is how we teach you here two possible answers so you can start preventing TCP sequence prediction attacks and so I can keep your network protected and secure at all times.

Information such as time difference or lower layers of protocols may help the destination host identify authentic TCP packets from the trusted host, as well as any fake packages that have been created. All this with the correct sequence number comparing it with the one sent by the attacker. Therefore if this information is available to the destination host, the attacker will not be able falsify any of the information, so the destination host will use only the correct information.

All this allows the destination host become immune to this type of TCP type sequence attacks. Another way to stop this type of attack is configuring the router or a firewall so that they are not allowed to enter packages from an external source, but with a internal IP address. Although this does not solve the attack, it will help you prevent it from being develop or that potential attacks can reach your destination causing some type of damage.