golang achieves traffic amplification

With the rapid development of the Internet, cyber attacks have become more common and rampant. In order to prevent these attacks, the field of network security has also spawned a variety of technologies. Among them, traffic amplification is a very common attack method in the field of network attacks. In the field of network security, defending against traffic amplification attacks has become a problem that every network security engineer needs to solve. This article will introduce how to use golang to achieve traffic amplification.

1. What is a traffic amplification attack?

Traffic amplification attack (Amplification Attack) is a kind of exploiting the flaws of some protocols or services to create malicious data traffic in the network, thereby causing a denial of service attack. Attackers use some specific protocols or services to disguise small data packets into huge data packets and send them to the target server, causing a significant increase in server bandwidth load, thereby reducing system availability or even paralysis.

In a traffic amplification attack, the attacker takes advantage of the vulnerability that the source IP address in the UDP protocol packet can be forged, changes the source IP address of the attack traffic to the IP of the attacked object, and then constructs some Interference information uses the characteristics of the relevant protocol to return a larger response result than the original data packet. Since attackers can forge source addresses to make the source of attack traffic untraceable, the power of the attack is amplified, and attackers can use a large number of intermediary servers to carry out attacks across network boundaries and even national borders, adding new challenges to security construction. .

2. Golang implements traffic amplification

To implement a traffic amplification attack on the server, you first need to select an appropriate protocol. Here we choose the DNS protocol as the attack method. When the DNS protocol provides domain name resolution services, it often needs to return a large amount of data, which makes it one of the common means for the DNS protocol to be used to implement traffic amplification attacks. In golang, we can use the functions provided by the net library to realize the construction and amplification of DNS traffic.

The specific implementation steps are as follows:

Step 1. Write a golang program to construct DNS request packets (taking UDP protocol as an example).

It is very simple to use golang to realize the packet construction and sending of DNS requests. When sending a request to the DNS server, we need to establish a UDP connection. In the UDP packet, we need to specify the destination address, port number, data length and other information. At the same time, we also need to fill in the header information of the DNS request message and specify the request type, query conditions and other parameters.

Step 2: Construct a DNS amplification request message.

Anyone who knows about DNS amplification attacks knows that when an attacker sends a data request to the DNS server, he must construct a DNS request message as small as possible. The specific implementation method is to construct a DNS message with invalid query conditions and as small a byte length as possible. The purpose of this is to reduce the size of the request message and increase the amount of data returned by the DNS server.

Step 3. Send DNS messages for amplification.

Send the constructed DNS packet to the DNS server. After the DNS server receives the request, it will automatically reply with a DNS response message. According to the principle of DNS amplification attack, the actual amount of returned data is significantly larger than the size of the request message sent, thereby achieving the purpose of traffic amplification attack.

3. Methods to defend against traffic amplification attacks

Since attackers use the flaws of the UDP protocol to implement traffic amplification attacks, we can prevent the network from being attacked through protection against the UDP protocol. The specific method is as follows:

Method 1: Current Limiting Processing

For UDP traffic, divide the traffic into fragments, and then limit the flow of each piece of traffic.

Method 2: Filter invalid DNS requests

By filtering DNS requests, delete illegal requests and avoid receiving unnecessary DNS traffic requests.

Method 3: Monitoring and firewall configuration

Add firewall configuration to protect network security, monitor network traffic in real time, identify high traffic and abnormal traffic, and troubleshoot problems in a timely manner.

In summary, it is very convenient to use golang to implement traffic amplification attacks, but for network security construction, preventing traffic amplification attacks is the key. We need to take a series of measures, such as appropriate flow limiting, filtering invalid packets, strengthening monitoring and firewall configuration, etc., to improve the security of the network system and prevent attackers from carrying out denial of service attacks on the network.

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