What does flood attack mean? The principle and harm of flood attack are explained in detail

in the digital age, cyber attacks have become a common risk that threatens the cyber security of enterprises and individuals. Among them, flood attacks frequently appear in various cyber security incidents due to their strong concealment and destructive power. Many people's cognition of this type of attack is only literal, and they do not know its specific operation and potential harm. This article will comprehensively dismantle flood attacks from the dimensions of basic definitions, core principles, common types, actual hazards and protective measures to help readers establish system cognition and improve cyber security protection awareness.

What is the basic definition of flood attack?

to gain a deeper understanding of this type of cyber attack, it is first necessary to clarify the core definition of flood attack and its essential differences from other cyber attacks.

1, the core connotation of flood attack

flood attack is a typical denial-of-service attack, the core logic is to send a request data packet far beyond the normal processing capacity to the target server or network node, occupying the target's bandwidth, memory, CPU and other core resources, eventually leading to the target system unable to respond to legitimate normal user requests, or even directly into a paralyzed state, just like flooding the dam, with excessive traffic to overwhelm the carrying capacity of network services.

2 Typical characteristics of flood attacks

such attacks usually have the characteristics of low cost, wide range of attack targets, and hidden attack traffic. The attacker does not need to master the vulnerabilities of the target system, but only needs to use simple attack tools or botnets to launch large-scale traffic attacks; the attack targets cover various network service nodes such as e-commerce platforms, financial systems, and government websites; some flood attacks also forge the source Internet Protocol Address of the requested data packet, making it difficult for the target to trace the source of the attack.

What are the core operating principles of flood attacks?

master the operation principle of flood attack, is the key to identify and prevent such attacks, the principle of resource occupation and connection exhaustion around the two core logic.

1, the principle of bandwidth resource exhaustion

this is the most basic operation logic of flood attack, the attacker by controlling a large number of zombie hosts, sending a large number of useless data packets to the target network node, these data packets will quickly occupy all the bandwidth of the target network, so that the legitimate user's request data packet can not be transmitted normally, just like narrow roads are blocked by a large number of unrelated vehicles, normal traffic vehicles can not move forward, and ultimately lead to the complete interruption of external services of the target network.

2, the principle of system resource exhaustion

part of the flood attack will attack the target server CPU, memory and other core system resources, such as the attacker will send a large number of complex operations to the target request data packet, so that the server's CPU is always in a high load state, or send a large number of semi-connection request, occupy the server's connection queue resources, resulting in the server has no extra resources to process legitimate user requests, and then into service paralysis.

What are the common types of flood attacks?

with the development of network technology, flood attacks have also derived a variety of different types, each type has a corresponding attack target and operation mode.

1, UDP flood attack

UDP flood attack is one of the most common types of flood attacks, it uses the UDP protocol no connection, no need to confirm the characteristics of the target server to send a large number of random port UDP data packets, the target server needs to process each data packet and return error messages, a large number of useless data packets will quickly exhaust the server's bandwidth and system resources, eventually leading to service interruption.

2, SYN flood attack

SYN flood attack against the TCP protocol three-way handshake mechanism to launch an attack, the attacker sends a large number of forged source Internet Protocol Address SYN request data packet to the target server, the server will return SYN + ACK data packet and wait for the source IP confirmation information, but because the source IP is forged, the server's connection queue will be occupied by a large number of semi-connection requests, eventually unable to receive legitimate users of normal connection requests.

3, HTTP flood attack

HTTP flood attack is mainly launched against the Web server, the attacker by controlling a large number of zombie hosts, sending massive legitimate HTTP requests to the target website, such as frequent page refresh, submit forms, etc., such requests are highly similar to normal user behavior, difficult to be recognized by conventional firewalls, and eventually will exhaust the processing power of the Web server, resulting in the website cannot be accessed normally.

What are the actual hazards of flood attacks?

understand the actual harm of flood attacks, in order to truly pay attention to the protection of such network attacks, its harm is not limited to network service interruption, but also extends to multiple levels.

1, direct economic loss

for enterprises relying on network services such as e-commerce platforms and online finance, the service interruption caused by flood attacks will directly cause the loss of orders and the stagnation of transactions, which can bring hundreds of thousands or even millions of yuan in economic losses in a short time. At the same time, enterprises need to invest a lot of manpower and material costs to restore system services and investigate the source of attacks.

2, brand reputation damage

frequent flood attacks on enterprises will make users question their cyber security protection capabilities, which in turn affects the brand reputation and user trust of enterprises. Especially financial and government platforms, once the service is interrupted due to flood attacks, it may also cause users to panic and have a negative impact on the long-term development of enterprises.

To sum up, flood attack is a very harmful denial of service network attack. Its core is to exhaust the target system resources through excessive traffic. Common types include UDP, SYN, HTTP and other forms, which will bring direct economic losses and brand reputation damage to enterprises. By understanding its definition, principle and harm, we can more accurately formulate protection strategies, improve the security bearing capacity of network systems, and effectively resist the threat of such network attacks.